CN103230936B - Rolling method of TC4 titanium alloy wide cut medium-thickness plates - Google Patents
Rolling method of TC4 titanium alloy wide cut medium-thickness plates Download PDFInfo
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Abstract
The invention provides a rolling method of TC4 titanium alloy wide cut medium-thickness plates. The rolling method includes the following steps: 1, first heating treatment is performed on TC4 titanium alloy plate blank with thickness ranging from 80mm to 150mm and length and width ranging from 800mm to 1200mm; 2, first rolling is performed on the TC4 titanium alloy plate blank to obtain semi-finished plate blank; 3, surface scale is removed after the semi-finished plate blank is sheared, and then second heating treatment is performed; and 4, second rolling is performed on the semi-finished plate blank to obtain TC4 titanium alloy wide cut medium-thickness plates with thickness ranging from 5mm to 30mm and width ranging from 1000mm to 2600mm. Through comprehensive control of rolling temperature, rolling heating number, heating number deformation and rolling directions, finally the TC4 titanium alloy wide cut medium-thickness plates with small anisotropism, high mechanical properties, strong plastic comprehensive matching are manufactured.
Description
Technical field
The invention belongs to titanium alloy material preparing technical field, be specifically related to a kind of milling method of TC4 titanium alloy wide medium-thick plate.
Background technology
Along with the development of the art such as Aero-Space, boats and ships, oil, chemical industry and nuclear power industry, higher quality requirements is proposed to TC4 titanium alloy (nominal composition is Ti-6Al-4V) medium-thick plate, as required sheet material anisotropy little, the transverse and longitudinal strength difference being specially room-temperature mechanical property is less than 40MPa.
Because TC4 titanium alloy organizes main body α phase to be close-packed hexagonal structure, inevitable generation crystal preferred orientation in process, and then form texture.Only have rolling technological parameter Comprehensive Control such as heating-up temperature, deflection, modes of texturing, the texture orientation of sheet material could be improved, finally make anisotropy diminish.
And conventional method fails to implement effective ground heddle conjunction control to rolling technological parameter at present, the anisotropy of final sheet material is large, and the transverse and longitudinal strength difference of general titanium alloy cut deal room-temperature mechanical property can reach 70 ~ 100MPa.Thus existing pair rolling method can not meet the little requirement of titanium alloy medium-thick plate anisotropy.The titanium alloy wide of TC4 described in the present invention cut deal refers to that thickness is 5mm ~ 30mm, and width is the TC4 titanium alloy plate of 1000mm ~ 2600mm.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides a kind of milling method of TC4 titanium alloy wide medium-thick plate.The method, by the Comprehensive Control to rolling temperature, rolling fire, fire time deflection and rolling direction, finally prepares that anisotropy is little, mechanical property is high, the TC4 titanium alloy wide medium-thick plate of strong plasticity comprehensive matching.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of milling method of TC4 titanium alloy wide medium-thick plate, and it is characterized in that, the method comprises the following steps:
Step one, be 80mm ~ 150mm by thickness, the TC4 titanium alloy slab that length and width are 800mm ~ 1200mm is placed in heating furnace, is to be incubated 60min ~ 120min under the condition of 930 DEG C ~ 950 DEG C to carry out the first heating in temperature;
Step 2, to be sent in 2800mm hot-rolling mill by the TC4 titanium alloy slab after heating carry out the first rolling in step one through first, obtaining thickness is 20mm ~ 67.5mm, and width is the semi-finished product slab of 800mm ~ 1200mm; The total deformation of described first rolling is 55% ~ 75%; Described first rolling is unidirection rolling;
Step 3, the length of the slab of semi-finished product described in step 2 is trimmed to 1000mm ~ 2600mm, then the semi-finished product slab after shearing being removed surface scale is placed in heating furnace, is be incubated 30min ~ 60min under the condition of 930 DEG C ~ 950 DEG C to carry out the second heating in temperature;
Step 4, to be sent in 2800mm hot-rolling mill by the semi-finished product slab after heating carry out the second rolling in step 3 through second, obtaining thickness is 5mm ~ 30mm, and width is the TC4 titanium alloy wide medium-thick plate of 1000mm ~ 2600mm; The total deformation of described second rolling is 55% ~ 75%, and the rolling direction of described second rolling is vertical with the rolling direction of the first rolling.
The milling method of above-mentioned a kind of TC4 titanium alloy wide medium-thick plate, it is characterized in that, the first rolling described in step 2 is divided into 5 ~ 7 passages and completes, and the pass deformation of described first rolling is 10% ~ 30%, and the speed of described first rolling is 1m/s ~ 3m/s.
The milling method of above-mentioned a kind of TC4 titanium alloy wide medium-thick plate, it is characterized in that, the temperature of infrared radiation thermometer to TC4 titanium alloy slab is adopted to monitor in step 2 in first operation of rolling, and the temperature of control TC4 titanium alloy slab is not less than 900 DEG C, detailed process is: after the temperature of TC4 titanium alloy slab is down to 900 DEG C ~ 910 DEG C, TC4 titanium alloy slab is placed in heating furnace, is be incubated 30min ~ 60min under the condition of 930 DEG C ~ 950 DEG C to carry out the first temper in temperature.
The milling method of above-mentioned a kind of TC4 titanium alloy wide medium-thick plate, is characterized in that, described in step one and step 3, heating furnace is roller hearth type heating furnace.
The milling method of above-mentioned a kind of TC4 titanium alloy wide medium-thick plate, it is characterized in that, the second rolling described in step 4 is divided into 5 ~ 7 passages and completes, and the pass deformation of described second rolling is 10% ~ 30%, and the speed of described second rolling is 1m/s ~ 3m/s.
The milling method of above-mentioned a kind of TC4 titanium alloy wide medium-thick plate, it is characterized in that, the temperature of infrared radiation thermometer double finished product slab is adopted to monitor in step 4 in second operation of rolling, and the temperature controlling semi-finished product slab is not less than 900 DEG C, detailed process is: after the temperature of semi-finished product slab is down to 900 DEG C ~ 910 DEG C, semi-finished product slab is placed in heating furnace, is be incubated 30min ~ 60min under the condition of 930 DEG C ~ 950 DEG C to carry out the second temper in temperature.
The milling method of above-mentioned a kind of TC4 titanium alloy wide medium-thick plate, it is characterized in that, the total deformation of the first rolling described in step 2 is equal with the total deformation of the second rolling described in step 4.
The present invention compared with prior art has the following advantages:
1, the present invention adopts two fire time rolling mill practices; First by TC4 titanium alloy slab along its length or width send in hot-rolling mill and carry out the first rolling, and to control the first rolling be unidirection rolling, obtains semi-finished product slab; Then semi-finished product slab is sent in hot-rolling mill and carry out the second rolling, and the rolling direction controlling the second rolling is vertical with the rolling direction of the first rolling, greatly can reduce the anisotropy of TC4 titanium alloy wide medium-thick plate thus.
2, the present invention all controls rolling total deformation and pass deformation in the first rolling and second operation of rolling, 55% ~ 75% is by the rolling total deformation controlling the first rolling and the second rolling, the rolling pass deflection controlling the first rolling and the second rolling is 10% ~ 30%, the final TC4 titanium alloy wide medium-thick plate obtaining little, the strong plasticity comprehensive matching of anisotropy.
3, the present invention carries out the first heating to TC4 titanium alloy slab before the first rolling, before the second rolling, double finished product slab carries out the second heating, and first heats with the second heating-up temperature heated all within the scope of 930 DEG C ~ 950 DEG C, rolling mill practice can be realized carry out smoothly, ensure the steady quality of TC4 titanium alloy wide medium-thick plate; And the present invention adopts the temperature of infrared radiation thermometer to TC4 titanium alloy slab to monitor in real time in first operation of rolling, after the temperature of TC4 titanium alloy slab is down to 900 DEG C ~ 910 DEG C, ensure that the rolling deformation temperature of TC4 titanium alloy slab controls within the scope of 900 DEG C ~ 950 DEG C by carrying out the first temper, thus realize the approximately constant of the first rolling temperature; The present invention adopts the temperature of infrared radiation thermometer double finished product slab to monitor in real time in second operation of rolling, after the temperature of semi-finished product slab is down to 900 DEG C ~ 910 DEG C, ensure that the rolling deformation temperature of semi-finished product slab controls within the scope of 900 DEG C ~ 950 DEG C by carrying out the second temper, thus realize the approximately constant of the second rolling temperature.
4, the present invention is by control first rolling and the comprehensive parameters such as the rolling temperature of second operation of rolling, fiery time deflection, pass deformation, rolling direction, finally can obtain the TC4 titanium alloy wide medium-thick plate of little, the strong plasticity comprehensive matching of anisotropy.
5, TC4 titanium alloy wide medium-thick plate of the present invention is after common annealing process, its tensile strength >=930MPa under room temperature (20 DEG C) condition, yield strength >=830MPa, percentage elongation >=12%; The transverse tensile strength of TC4 titanium alloy wide medium-thick plate of the present invention and the difference <30MPa of endwise tensile strength, the difference <30MPa of transverse yield strength and longitudinal yield strength, the difference <3% of transverse breakage percentage elongation and longitudinal fracture percentage elongation; Illustrate that the anisotropy of TC4 titanium alloy wide medium-thick plate of the present invention is little, good mechanical performance.
Below in conjunction with embodiment, the present invention is described in further detail.
Detailed description of the invention
Embodiment 1
The milling method of the present embodiment TC4 titanium alloy wide medium-thick plate comprises the following steps:
Step one, be 150mm by thickness, the TC4 titanium alloy slab that length and width are 1200mm is placed in roller hearth type heating furnace, is to be incubated 80min under the condition of 940 DEG C to carry out the first heating in temperature;
Step 2, by the TC4 titanium alloy slab after heating through first in step one along its length or width send in 2800mm hot-rolling mill and carry out the first rolling, obtaining thickness is 67.1mm, and width is the semi-finished product slab of 1200mm; Described first rolling is unidirection rolling, and in first operation of rolling, adopt the temperature of infrared radiation thermometer to TC4 titanium alloy slab to monitor, the temperature of control TC4 titanium alloy slab is not less than 900 DEG C, detailed process is: after the temperature of TC4 titanium alloy slab is down to 905 DEG C, TC4 titanium alloy slab is placed in roller hearth type heating furnace, is be incubated 50min under the condition of 940 DEG C to carry out the first temper in temperature; Described first rolling is divided into 5 passages and completes, and the deflection of each passes is respectively 20%, 18%, 13.4%, 12.5%, 10%, and the total deformation of described first rolling is 55.26%, and the speed of described first rolling is 2m/s;
Step 3, the length of the slab of semi-finished product described in step 2 is trimmed to 2600mm, then the semi-finished product slab after shearing being removed surface scale and be placed in roller hearth type heating furnace, is be incubated 50min under the condition of 940 DEG C to carry out the second heating in temperature;
Step 4, to be sent in hot-rolling mill by the semi-finished product slab after heating carry out the second rolling in step 3 through second, obtaining thickness is 30mm, and width is the TC4 titanium alloy wide medium-thick plate of 2600mm; The rolling direction of described second rolling is vertical with the rolling direction of the first rolling, and in second operation of rolling, adopt the temperature of infrared radiation thermometer double finished product slab to monitor, the temperature controlling semi-finished product slab is not less than 900 DEG C, detailed process is: after the temperature of semi-finished product slab is down to 905 DEG C, semi-finished product slab is placed in roller hearth type heating furnace, is be incubated 30min under the condition of 940 DEG C to carry out the second temper in temperature; Described second rolling is divided into 5 passages and completes, and the deflection of each passes is respectively 20%, 18%, 13.4%, 12.5%, 10%, and the total deformation of described second rolling is 55.26%, and the speed of described second rolling is 2m/s.
The performance data of the present embodiment TC4 titanium alloy wide medium-thick plate after common annealing process (being incubated about 1h under being the condition of 800 DEG C in temperature) is in table 1.
Embodiment 2
The milling method of the present embodiment TC4 titanium alloy wide medium-thick plate comprises the following steps:
Step one, be 80mm by thickness, width is 800mm, and length is that the TC4 titanium alloy slab of 1200mm is placed in roller hearth type heating furnace, is be incubated 60min under the condition of 950 DEG C to carry out the first heating in temperature;
Step 2, the TC4 titanium alloy slab after heating sent into along its length in 2800mm hot-rolling mill and carry out the first rolling in step one through first, obtaining thickness is 20mm, and width is the semi-finished product slab of 800mm; Described first rolling is unidirection rolling, and in first operation of rolling, adopt the temperature of infrared radiation thermometer to TC4 titanium alloy slab to monitor, the temperature of control TC4 titanium alloy slab is not less than 900 DEG C, detailed process is: after the temperature of TC4 titanium alloy slab is down to 910 DEG C, TC4 titanium alloy slab is placed in roller hearth type heating furnace, is be incubated 30min under the condition of 950 DEG C to carry out the first temper in temperature; Described first rolling is divided into 7 passages and completes, and each pass deformation is respectively 30%, 25%, 20%, 16.5%, 12%, 10%, 10%, and the total deformation of described first rolling is 75%, and the speed of described first rolling is 3m/s;
Step 3, the length of the slab of semi-finished product described in step 2 is trimmed to 2400mm, then the semi-finished product slab after shearing is removed surface scale and be placed in roller hearth type heating furnace and carry out the second heating; Described second temperature heated is 950 DEG C, and the described second time of heating was 30min;
Step 4, to be sent in hot-rolling mill by the semi-finished product slab after heating carry out the second rolling in step 3 through second, obtaining thickness is 5mm, and width is the TC4 titanium alloy wide medium-thick plate of 2400mm; The rolling direction of described second rolling is vertical with the rolling direction of the first rolling, and in second operation of rolling, adopt the temperature of infrared radiation thermometer double finished product slab to monitor, the temperature controlling semi-finished product slab is not less than 900 DEG C, detailed process is: after the temperature of semi-finished product slab is down to 910 DEG C, semi-finished product slab is placed in roller hearth type heating furnace, is be incubated 60min under the condition of 950 DEG C to carry out the second temper in temperature; Described second rolling is divided into 7 passages and completes, and the deflection of each passes is respectively 30%, 25%, 20%, 16.5%, 12%, 10%, 10%, and the total deformation of described second rolling is 75%; The speed of described second rolling is 3m/s.
The performance data of the present embodiment TC4 titanium alloy wide medium-thick plate after common annealing process (being incubated about 1h under being the condition of 800 DEG C in temperature) is in table 1.
Embodiment 3
The milling method of the present embodiment TC4 titanium alloy wide medium-thick plate comprises the following steps:
Step one, be 120mm by thickness, the TC4 titanium alloy slab that length and width are 800mm is placed in roller hearth type heating furnace and carries out the first heating; Described first temperature heated is 930 DEG C, and the described first time of heating was 120min;
Step 2, by the TC4 titanium alloy slab after heating through first in step one along its length or width send in 2800mm hot-rolling mill and carry out the first rolling, obtaining thickness is 49mm, and width is the semi-finished product slab of 800mm; Described first rolling is unidirection rolling, and in first operation of rolling, adopt the temperature of infrared radiation thermometer to TC4 titanium alloy slab to monitor, the temperature of control TC4 titanium alloy slab is not less than 900 DEG C, detailed process is: when the temperature of TC4 titanium alloy slab is down to 908 DEG C, TC4 titanium alloy slab is placed in roller hearth type heating furnace, is be incubated 45min under the condition of 935 DEG C to carry out the first temper in temperature; Described first rolling is divided into 6 passages and completes, and the deflection of each passes is respectively 20%, 15.8%, 14%, 12%, 11%, 10%, and the total deformation of described first rolling is 59.17%, and the speed of described first rolling is 1.5m/s;
Step 3, the length of the slab of semi-finished product described in step 2 is trimmed to 1900mm, then the semi-finished product slab after shearing is removed surface scale and be placed in roller hearth type heating furnace and carry out the second heating; Described second temperature heated is 930 DEG C, and the described second time of heating was 45min;
Step 4, to be sent in hot-rolling mill by the semi-finished product slab after heating carry out the second rolling in step 3 through second, obtaining thickness is 20mm, and width is the TC4 titanium alloy wide medium-thick plate of 1900mm; The rolling direction of described second rolling is vertical with the rolling direction of the first rolling, and in second operation of rolling, adopt the temperature of infrared radiation thermometer double finished product slab to monitor, the temperature controlling semi-finished product slab is not less than 900 DEG C, detailed process is: when the temperature of semi-finished product slab is down to 908 DEG C, semi-finished product slab is placed in roller hearth type heating furnace, is be incubated 45min under the condition of 935 DEG C to carry out the second temper in temperature; Described second rolling is divided into 6 passages and completes, and the deflection of each passes is respectively 20%, 15.8%, 14%, 12%, 11%, 10%, and the total deformation of described second rolling is 59.17%; The speed of described second rolling is 1.5m/s.
The performance data of the present embodiment TC4 titanium alloy wide medium-thick plate after common annealing process (being incubated about 1h under being the condition of 800 DEG C in temperature) is in table 1.
Embodiment 4
The milling method of the present embodiment TC4 titanium alloy wide medium-thick plate comprises the following steps:
Step one, be 100mm by thickness, width is 900mm, and length is that the TC4 titanium alloy slab of 1000mm is placed in roller hearth type heating furnace and carries out the first heating; Described first temperature heated is 950 DEG C, and the described first time of heating was 60min;
Step 2, the TC4 titanium alloy slab after heating sent into along its length in 2800mm hot-rolling mill and carry out the first rolling in step one through first, obtaining thickness is 40mm, and width is the semi-finished product slab of 900mm; Described first rolling is unidirection rolling, and in first operation of rolling, adopt the temperature of infrared radiation thermometer to TC4 titanium alloy slab to monitor, the temperature of control TC4 titanium alloy slab is not less than 900 DEG C, detailed process is: when the temperature of TC4 titanium alloy slab is down to 906 DEG C, TC4 titanium alloy slab is placed in roller hearth type heating furnace, is be incubated 60min under the condition of 950 DEG C to carry out the first temper in temperature; Described first rolling is divided into 6 passages and completes, and the deflection of each passes is respectively 20%, 18%, 14%, 12.5%, 10%, 10%, and the total deformation of described first rolling is 60%, and the speed of described first rolling is 2m/s;
Step 3, the length of the slab of semi-finished product described in step 2 is trimmed to 1000mm, then the semi-finished product slab after shearing is removed surface scale and be placed in roller hearth type heating furnace and carry out the second heating; Described second temperature heated is 950 DEG C, and the described second time of heating was 60min;
Step 4, to be sent in hot-rolling mill by the semi-finished product slab after heating carry out the second rolling in step 3 through second, obtaining thickness is 16mm, and width is the TC4 titanium alloy wide medium-thick plate of 1000mm; The rolling direction of described second rolling is vertical with the rolling direction of the first rolling, and in second operation of rolling, adopt the temperature of infrared radiation thermometer double finished product slab to monitor, the temperature controlling semi-finished product slab is not less than 900 DEG C, detailed process is: after the temperature of semi-finished product slab is down to 907 DEG C, semi-finished product slab is placed in roller hearth type heating furnace, is be incubated 40min under the condition of 950 DEG C to carry out the second temper in temperature; Described second rolling is divided into 6 passages and completes, and the deflection of each passes is respectively 20%, 18%, 14%, 12.5%, 10%, 10%, and the total deformation of described second rolling is 60%, and the speed of described second rolling is 2m/s.
The performance data of the present embodiment TC4 titanium alloy wide medium-thick plate after common annealing process (being incubated about 1h under being the condition of 800 DEG C in temperature) is in table 1.
Embodiment 5
The milling method of the present embodiment TC4 titanium alloy wide medium-thick plate comprises the following steps:
Step one, be 90mm by thickness, width is 1100mm, and length is that the TC4 titanium alloy slab of 1200mm is placed in roller hearth type heating furnace and carries out the first heating; Described first temperature heated is 940 DEG C, and the described first time of heating was 80min;
Step 2, the TC4 titanium alloy slab after heating sent into along its length in 2800mm hot-rolling mill and carry out the first rolling in step one through first, obtaining thickness is 30mm, and width is the semi-finished product slab of 1100mm; Described first rolling is unidirection rolling, and in first operation of rolling, adopt the temperature of infrared radiation thermometer to TC4 titanium alloy slab to monitor, the temperature of control TC4 titanium alloy slab is not less than 900 DEG C, detailed process is: when the temperature of TC4 titanium alloy slab is down to 903 DEG C, TC4 titanium alloy slab is placed in roller hearth type heating furnace, is be incubated 40min under the condition of 940 DEG C to carry out the first temper in temperature; Described first rolling is divided into 6 passages and completes, and the deflection of each passes is respectively 23%, 21%, 18.5%, 15%, 12%, 10%, and the total deformation of described first rolling is 66.63%, and the speed of described first rolling is 2.5m/s;
Step 3, the length of the slab of semi-finished product described in step 2 is trimmed to 1800mm, then the semi-finished product slab after shearing is removed surface scale and be placed in roller hearth type heating furnace and carry out the second heating; Described second temperature heated is 940 DEG C, and the described second time of heating was 40min;
Step 4, to be sent in hot-rolling mill by the semi-finished product slab after heating carry out the second rolling in step 3 through second, obtaining thickness is 10mm, and width is the TC4 titanium alloy wide medium-thick plate of 1800mm; The rolling direction of described second rolling is vertical with the rolling direction of the first rolling, and in second operation of rolling, adopt the temperature of infrared radiation thermometer double finished product slab to monitor, the temperature controlling semi-finished product slab is not less than 900 DEG C, detailed process is: when the temperature of semi-finished product slab is down to 903 DEG C, semi-finished product slab is placed in roller hearth type heating furnace, is be incubated 40min under the condition of 940 DEG C to carry out the second temper in temperature; Described second rolling is divided into 6 passages and completes, and the deflection of each passes is respectively 23%, 21%, 18.5%, 15%, 12%, 10%, and the total deformation of described second rolling is 66.63%, and the speed of described second rolling is 2.5m/s.
The performance data of the present embodiment TC4 titanium alloy wide medium-thick plate after common annealing process (being incubated about 1h under being the condition of 800 DEG C in temperature) is in table 1.
Embodiment 6
The milling method of the present embodiment TC4 titanium alloy wide medium-thick plate comprises the following steps:
Step one, be 135mm by thickness, width is 1000mm, and length is that the TC4 titanium alloy slab of 1100mm is placed in roller hearth type heating furnace and carries out the first heating; Described first temperature heated is 930 DEG C, and the described first time of heating was 120min;
Step 2, the TC4 titanium alloy slab after heating sent into along its length in 2800mm hot-rolling mill and carry out the first rolling in step one through first, obtaining thickness is 40.2mm, and width is the semi-finished product slab of 1000mm; Described first rolling is unidirection rolling, and in first operation of rolling, adopt the temperature of infrared radiation thermometer to TC4 titanium alloy slab to monitor, the temperature of control TC4 titanium alloy slab is not less than 900 DEG C, detailed process is: when the temperature of TC4 titanium alloy slab is down to 900 DEG C, TC4 titanium alloy slab is placed in roller hearth type heating furnace, is be incubated 30min under the condition of 930 to carry out the first temper in temperature; Described first rolling is divided into 5 passages and completes, and the deflection of each passes is respectively 30%, 25%, 20%, 18%, 13.5%, and the total deformation of described first rolling is 70.21%, and the speed of described first rolling is 1m/s;
Step 3, the length of the slab of semi-finished product described in step 2 is trimmed to 1200mm, then the semi-finished product slab after shearing is removed surface scale and be placed in roller hearth type heating furnace and carry out the second heating; Described second temperature heated is 930 DEG C, and the described second time of heating was 60min;
Step 4, to be sent in hot-rolling mill by the semi-finished product slab after heating carry out the second rolling in step 3 through second, obtaining thickness is 12mm, and width is the TC4 titanium alloy wide medium-thick plate of 1200mm, the rolling direction of described second rolling is vertical with the rolling direction of the first rolling, and in second operation of rolling, adopt the temperature of infrared radiation thermometer double finished product slab to monitor, the temperature controlling semi-finished product slab is not less than 900 DEG C, detailed process is: when the temperature of semi-finished product slab is down to 900 DEG C, semi-finished product slab is placed in roller hearth type heating furnace, be be incubated 30min under the condition of 930 DEG C to carry out the second temper in temperature, described second rolling is divided into 5 passages and completes, the deflection of each passes is respectively 30%, 25%, 20%, 18%, 13.5%, the total deformation of described second rolling is 70.21%, the speed of described second rolling is 1m/s.
The performance data of the present embodiment TC4 titanium alloy wide medium-thick plate after common annealing process (being incubated about 1h under being the condition of 800 DEG C in temperature) is in table 1.
Embodiment 7
The milling method of the present embodiment TC4 titanium alloy wide medium-thick plate comprises the following steps:
Step one, be 150mm by thickness, width is 800mm, and length is that the TC4 titanium alloy slab of 900mm is placed in roller hearth type heating furnace, is be incubated 80min under the condition of 940 DEG C to carry out the first heating in temperature;
Step 2, the TC4 titanium alloy slab after heating sent in the width direction in 2800mm hot-rolling mill and carry out the first rolling in step one through first, obtaining thickness is 67.5mm, and width is the semi-finished product slab of 900mm; Described first rolling is unidirection rolling, and in first operation of rolling, adopt the temperature of infrared radiation thermometer to TC4 titanium alloy slab to monitor, the temperature of control TC4 titanium alloy slab is not less than 900 DEG C, detailed process is: after the temperature of TC4 titanium alloy slab is down to 905 DEG C, TC4 titanium alloy slab is placed in roller hearth type heating furnace, is be incubated 50min under the condition of 940 DEG C to carry out the first temper in temperature; Described first rolling is divided into 5 passages and completes, and the deflection of each passes is respectively 20%, 18%, 12.9%, 12.5%, 10%, and the total deformation of described first rolling is 55%, and the speed of described first rolling is 2m/s;
Step 3, the length of the slab of semi-finished product described in step 2 is trimmed to 1700mm, then the semi-finished product slab after shearing being removed surface scale and be placed in roller hearth type heating furnace, is be incubated 50min under the condition of 940 DEG C to carry out the second heating in temperature;
Step 4, to be sent in hot-rolling mill by the semi-finished product slab after heating carry out the second rolling in step 3 through second, obtaining thickness is 28.8mm, and width is the TC4 titanium alloy wide medium-thick plate of 1700mm; The rolling direction of described second rolling is vertical with the rolling direction of the first rolling, and in second operation of rolling, adopt the temperature of infrared radiation thermometer double finished product slab to monitor, the temperature controlling semi-finished product slab is not less than 900 DEG C, detailed process is: after the temperature of semi-finished product slab is down to 905 DEG C, semi-finished product slab is placed in roller hearth type heating furnace, is be incubated 30min under the condition of 940 DEG C to carry out the second temper in temperature; Described second rolling is divided into 5 passages and completes, and the deflection of each passes is respectively 20%, 18%, 15%, 15%, 10%, and the total deformation of described second rolling is 57.34%, and the speed of described second rolling is 2m/s.
The performance data of the present embodiment TC4 titanium alloy wide medium-thick plate after common annealing process (being incubated about 1h under being the condition of 800 DEG C in temperature) is in table 1.
Embodiment 8
The milling method of the present embodiment TC4 titanium alloy wide medium-thick plate comprises the following steps:
Step one, be 80mm by thickness, width is 900mm, and length is that the TC4 titanium alloy slab of 1100mm is placed in roller hearth type heating furnace, is be incubated 90min under the condition of 940 DEG C to carry out the first heating in temperature;
Step 2, the TC4 titanium alloy slab after heating sent in the width direction in 2800mm hot-rolling mill and carry out the first rolling in step one through first, obtaining thickness is 20mm, and width is the semi-finished product slab of 1100mm; Described first rolling is unidirection rolling, and in first operation of rolling, adopt the temperature of infrared radiation thermometer to TC4 titanium alloy slab to monitor, the temperature of control TC4 titanium alloy slab is not less than 900 DEG C, detailed process is: after the temperature of TC4 titanium alloy slab is down to 905 DEG C, TC4 titanium alloy slab is placed in roller hearth type heating furnace, is be incubated 50min under the condition of 940 DEG C to carry out the first temper in temperature; Described first rolling is divided into 7 passages and completes, and the deflection of each passes is respectively 30%, 25%, 20%, 16.5%, 12%, 10%, 10%, and the total deformation of described first rolling is 75%, and the speed of described first rolling is 2m/s;
Step 3, the length of the slab of semi-finished product described in step 2 is trimmed to 1800mm, then the semi-finished product slab after shearing being removed surface scale and be placed in roller hearth type heating furnace, is be incubated 50min under the condition of 940 DEG C to carry out the second heating in temperature;
Step 4, to be sent in hot-rolling mill by the semi-finished product slab after heating carry out the second rolling in step 3 through second, obtaining thickness is 9mm, and width is the TC4 titanium alloy wide medium-thick plate of 1800mm; The rolling direction of described second rolling is vertical with the rolling direction of the first rolling, and in second operation of rolling, adopt the temperature of infrared radiation thermometer double finished product slab to monitor, the temperature controlling semi-finished product slab is not less than 900 DEG C, detailed process is: after the temperature of semi-finished product slab is down to 905 DEG C, semi-finished product slab is placed in roller hearth type heating furnace, is be incubated 30min under the condition of 940 DEG C to carry out the second temper in temperature; Described second rolling is divided into 5 passages and completes, and the deflection of each passes is respectively 20%, 18%, 12.9%, 12.5%, 10%, and the total deformation of described second rolling is 55%, and the speed of described second rolling is 2m/s.
The performance data of the present embodiment TC4 titanium alloy wide medium-thick plate after common annealing process (being incubated about 1h under being the condition of 800 DEG C in temperature) is in table 1.
The performance data of table 1 TC4 titanium alloy wide of the present invention medium-thick plate
As shown in Table 1, TC4 titanium alloy wide medium-thick plate of the present invention is after common annealing process (being incubated about 1h under being the condition of 800 DEG C in temperature), its tensile strength >=930MPa under room temperature (20 DEG C) condition, yield strength >=830MPa, percentage elongation >=12%; And the transverse tensile strength of TC4 titanium alloy wide medium-thick plate of the present invention and the difference <30MPa of endwise tensile strength, the difference <30MPa of transverse yield strength and longitudinal yield strength, the difference <3% of transverse breakage percentage elongation and longitudinal fracture percentage elongation; Illustrate that the anisotropy of TC4 titanium alloy wide medium-thick plate of the present invention is little thus, good mechanical performance.
The above is only preferred embodiment of the present invention, not imposes any restrictions the present invention.Every above embodiment is done according to invention technical spirit any simple modification, change and equivalence change, all still belong in the protection domain of technical solution of the present invention.
Claims (5)
1. a milling method for TC4 titanium alloy wide medium-thick plate, is characterized in that, the method comprises the following steps:
Step one, be 80mm ~ 150mm by thickness, the TC4 titanium alloy slab that length and width are 800mm ~ 1200mm is placed in heating furnace, is to be incubated 60min ~ 120min under the condition of 930 DEG C ~ 950 DEG C to carry out the first heating in temperature;
Step 2, to be sent in 2800mm hot-rolling mill by the TC4 titanium alloy slab after heating carry out the first rolling in step one through first, obtaining thickness is 20mm ~ 67.5mm, and width is the semi-finished product slab of 800mm ~ 1200mm; The total deformation of described first rolling is 55% ~ 75%; Described first rolling is unidirection rolling;
Step 3, the length of the slab of semi-finished product described in step 2 is trimmed to 1000mm ~ 2600mm, then the semi-finished product slab after shearing being removed surface scale is placed in heating furnace, is be incubated 30min ~ 60min under the condition of 930 DEG C ~ 950 DEG C to carry out the second heating in temperature;
Step 4, to be sent in 2800mm hot-rolling mill by the semi-finished product slab after heating carry out the second rolling in step 3 through second, obtaining thickness is 5mm ~ 30mm, and width is the TC4 titanium alloy wide medium-thick plate of 1000mm ~ 2600mm; The total deformation of described second rolling is 55% ~ 75%, and the rolling direction of described second rolling is vertical with the rolling direction of the first rolling;
The temperature of infrared radiation thermometer to TC4 titanium alloy slab is adopted to monitor in step 2 in first operation of rolling, the temperature of control TC4 titanium alloy slab is not less than 900 DEG C, detailed process is: after the temperature of TC4 titanium alloy slab is down to 900 DEG C ~ 910 DEG C, TC4 titanium alloy slab is placed in heating furnace, is be incubated 30min ~ 60min under the condition of 930 DEG C ~ 950 DEG C to carry out the first temper in temperature;
The temperature of infrared radiation thermometer double finished product slab is adopted to monitor in step 4 in second operation of rolling, the temperature controlling semi-finished product slab is not less than 900 DEG C, detailed process is: after the temperature of semi-finished product slab is down to 900 DEG C ~ 910 DEG C, semi-finished product slab is placed in heating furnace, is be incubated 30min ~ 60min under the condition of 930 DEG C ~ 950 DEG C to carry out the second temper in temperature.
2. the milling method of a kind of TC4 titanium alloy wide medium-thick plate according to claim 1, it is characterized in that, first rolling described in step 2 is divided into 5 ~ 7 passages and completes, and the pass deformation of described first rolling is 10% ~ 30%, and the speed of described first rolling is 1m/s ~ 3m/s.
3. the milling method of a kind of TC4 titanium alloy wide medium-thick plate according to claim 1, is characterized in that, described in step one and step 3, heating furnace is roller hearth type heating furnace.
4. the milling method of a kind of TC4 titanium alloy wide medium-thick plate according to claim 1, it is characterized in that, second rolling described in step 4 is divided into 5 ~ 7 passages and completes, and the pass deformation of described second rolling is 10% ~ 30%, and the speed of described second rolling is 1m/s ~ 3m/s.
5. the milling method of a kind of TC4 titanium alloy wide medium-thick plate according to claim 1, it is characterized in that, the total deformation of the first rolling described in step 2 is equal with the total deformation of the second rolling described in step 4.
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