CN114351066B - Preparation method of TC11 forging with 1060MPa strength level - Google Patents
Preparation method of TC11 forging with 1060MPa strength level Download PDFInfo
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- CN114351066B CN114351066B CN202111668006.2A CN202111668006A CN114351066B CN 114351066 B CN114351066 B CN 114351066B CN 202111668006 A CN202111668006 A CN 202111668006A CN 114351066 B CN114351066 B CN 114351066B
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Abstract
The invention provides a preparation method of a TC11 forging with the strength level of 1060MPa, which can well solve the practical problem that the tensile strength of the TC11 titanium alloy forging is difficult to reach 1060MPa when the effective thickness of the forging exceeds 75mm in the current engineering production. A preparation method of a TC11 forging with the strength level of 1060MPa is characterized by comprising the following steps: (1) Forging, wherein the forging heating temperature of the TC11 titanium alloy is Tbeta-30 to Tbeta-50 ℃, and the strain value of the TC11 forging body is not less than 0.25 when the TC11 forging body is deformed by the last fire; (2) And (3) performing heat treatment, wherein the effective thickness of the TC11 forge piece is controlled within 75-180mm before the heat treatment, the heat treatment comprises primary annealing and secondary annealing, the annealing temperature of the primary annealing is 950 ℃, and is 1-2 hours, and the annealing temperature of the secondary annealing is 520 ℃, and is 5-6 hours.
Description
Technical Field
The invention relates to the technical field of material science, in particular to the technical field of titanium alloy, and particularly relates to a preparation method of a 1060MPa strength TC11 forge piece.
Background
The titanium alloy is one of main structural materials of modern airplanes and engines, and has very important significance in the aspects of reducing the weight of the airplane, improving the thrust-weight ratio of the airplane, increasing the flying distance, reducing the fuel cost and the like. With the rapid development of aerospace industry in China, the requirements on aircraft structural materials are more remarkably focused on light weight, high strength and high toughness. Under the requirement, the TC11 titanium alloy is widely applied due to the excellent matching of high strength and high toughness, but the design and production of parts with larger effective thickness and higher static strength requirements are limited due to the poor thermal conductivity of the titanium alloy, and the comprehensive performance of the airplane and engine parts tends to pursue integration and upsizing, so that certain contradictions exist. For TC11 titanium alloy forgings, when the single weight of the titanium alloy forgings is less than 80kg, the tensile strength index of the titanium alloy forgings is more than or equal to 1060MPa, and when the single weight of the titanium alloy forgings is 80 to 150kg, the tensile strength index of the titanium alloy forgings is more than or equal to 1030MPa, and despite the clear specification of GJB2220A, the following problems still plague engineering operators in engineering application:
(1) The single weight of the forging is not more than 80kg, but the tensile strength of the forging is difficult to meet the requirement of more than or equal to 1060MPa when the effective thickness of the forging in heat treatment exceeds 75 mm.
(2) When the single weight of the forging is within the range of 80-150kg and the effective thickness exceeds 75mm, the tensile strength of the forging is required to meet the requirement of more than or equal to 1060MPa by part of customers of larger parts, and the forging is difficult to realize in engineering.
The published data shows that the original TC11 components are changed on the method for improving the strength and toughness of the large-specification TC11 titanium alloy, such as adding Nb, improving the Al content and the like, and the component control and corresponding process control reports of the TC11 titanium alloy are less.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a preparation method of a TC11 forging with the strength grade of 1060MPa, which can well solve the practical problem that the tensile strength of the TC11 titanium alloy forging is difficult to reach 1060MPa when the effective thickness of the forging exceeds 75mm in the existing engineering production.
The technical scheme is that the preparation method of the TC11 forging with the 1060MPa strength grade is characterized in that,
the TC11 forging raw material comprises the following components in percentage by mass:
5.8 to 7.0 percent of Al, 3.0 to 3.8 percent of Mo, 1.0 to 2.0 percent of Zr, 0.20 to 0.35 percent of Si, 0 to 0.05 percent of N, 0 to 0.01 percent of H, 0 to 0.08 percent of C, 0.10 to 0.25 percent of Fe, 0 to 0.15 percent of O, and the balance of Ti and inevitable impurities;
the preparation method comprises the following steps:
(1) Forging, wherein the forging heating temperature of the TC11 titanium alloy is Tbeta-30 to Tbeta-50 ℃, and the strain value of the TC11 forging body is not less than 0.25 when the TC11 forging body is deformed by the last fire;
(2) And (3) performing heat treatment, wherein the effective thickness of the TC11 forge piece is controlled within 75-180mm before the heat treatment, the heat treatment comprises primary annealing and secondary annealing, the annealing temperature of the primary annealing is 950 ℃, and is 1-2 hours, and the annealing temperature of the secondary annealing is 520 ℃, and is 6-7 hours.
Further, the TC11 forging raw material comprises the following components in percentage by mass: 6.8% of Al, 3.3% of Mo, 1.0% of Zr, 0.20% of Si, 0.025% of N, 0.01% of H, 0.04% of C, 0.10% of Fe, 0.11% of O, 0.01% of unavoidable impurities, and the balance Ti.
Furthermore, the total amount of the unavoidable impurities is 0-0.30% by mass, and any single impurity in the unavoidable impurities is 0-0.10% by mass.
Furthermore, the annealing time of the primary annealing is 1.5h, and the annealing time of the secondary annealing is 6h.
The preparation method disclosed by the invention has the following beneficial effects:
(1) The method optimizes the component control in the conventional TC11 component control range, particularly further controls Mo, zr and Fe elements, increases the strengthening elements on one hand, and has obvious influence on hardenability on the other hand, thereby improving the strength level of the forging and meeting the requirement that the tensile strength of the TC11 forging with the thickness of more than 75mm reaches 1060MPa to a greater extent;
(2) The final thermal strain value of forging is not less than 0.25, so that corresponding deformation of each area can be realized, and the problem that the performance of a non-strain or low-strain area is not good due to insufficient deformation is avoided;
(3) The effective thickness of the forging is limited by heat treatment and is controlled to be below 180mm, so that the hardenability of the material is fully shown, and the mechanical property of the center part of the forging can still meet the requirement of 1060MPa no matter the thickness of the forging is below 80kg, 80kg to 150kg or more than 150kg.
Detailed Description
Example 1
The TC11 forging raw material, namely the TC11 titanium alloy bar, is purchased from Baoji titanium industries, inc., and has the diameter of 300mm and the weight of 150kg.
The TC11 titanium alloy bar comprises the following components (in wt%):
6.8% of Al, 3.3% of Mo, 1.0% of Zr, 0.20% of Si, 0.025% of N, 0.01% of H, 0.04% of C, 0.10% of Fe, 0.11% of O, and the balance of Ti and inevitable impurities, the inevitable impurities being 0.01%.
The preparation method of the forging comprises the following steps:
(1) Forging, wherein the forging heating temperature of the TC11 forging is T beta-40 ℃, the deformation strain value is 0-2, the forging heating temperature before the last fire deformation is T beta-40 ℃, and the minimum strain value of the TC11 forging body is 0.25 when the last fire deformation is carried out;
(2) And (3) performing heat treatment, wherein the effective thickness of the forged TC11 forging is controlled to be 180mm without further reduction control (if the effective thickness exceeds 180mm, the thickness is reduced by turning or the like), wherein the heat treatment comprises primary annealing and secondary annealing, the annealing temperature of the primary annealing is 950 ℃, the annealing time is 1.5h, the annealing temperature of the secondary annealing is 520 ℃, and the annealing time is 6h.
Comparative example 1
The TC11 forging raw material of the comparative example, namely the TC11 titanium alloy bar, is purchased from Baoji titanium industries, inc., 300mm in diameter and 150kg in weight.
The TC11 titanium alloy bar comprises the following components (in wt%):
6.5% of Al, 2.8% of Mo, 0.8% of Zr, 0.20% of Si, 0.025% of N, 0.01% of H, 0.04% of C, 0.01% of Fe, 0.05% of O, and the balance of Ti and inevitable impurities, the inevitable impurities being 0.01%.
The preparation method of the forging comprises the following steps:
(1) Forging, wherein the forging heating temperature of the TC11 forging is Tbeta-40 ℃, the deformation strain value is 0-2, the forging heating temperature before the last fire deformation is Tbeta-40 ℃, and the minimum strain value of the TC11 forging body is 0.25 when the last fire deforms;
(2) And (3) performing heat treatment, wherein the effective thickness of the forged TC11 forging is controlled to be 180mm without further reduction control (if the effective thickness exceeds 180mm, the thickness is reduced by turning or the like), wherein the heat treatment comprises primary annealing and secondary annealing, the annealing temperature of the primary annealing is 950 ℃, the annealing time is 1.5h, the annealing temperature of the secondary annealing is 520 ℃, and the annealing time is 6h.
Supplementary notes:
the TC11 titanium alloy in the GJB2220A standard is controlled by the following components: 5.8 to 7.0 percent of Al, 2.8 to 3.8 percent of Mo, 0.8 to 2.0 percent of Zr, 0.20 to 0.35 percent of Si, 0 to 0.05 percent of N, 0 to 0.01 percent of H, 0 to 0.08 percent of C, 0 to 0.25 percent of Fe, 0 to 0.15 percent of O, and the balance of Ti and inevitable impurities, wherein the total amount of the inevitable impurities is 0 to 0.30 percent, and 0 to 0.10 percent of any one single impurity in the inevitable impurities.
The recommended process for the heat treatment of the TC11 forge piece in the GJB2220A standard is as follows: primary annealing is carried out, wherein the temperature is 950 ℃, and the adjustment is allowed within the temperature range of Tbeta-30 to Tbeta-50 ℃; and (4) secondary annealing at 520-540 ℃.
Comparative table of properties of forgings prepared in example 1 and comparative example
As can be seen from the above table, by adopting the preparation method of the TC11 forging, the tensile strength of the product can meet the requirement of more than or equal to 1060, and the applicant also finds that when the effective thickness of the TC11 forging is not controlled before the heat treatment, for example, the effective thicknesses are respectively 200mm, 250mm and 300mm, the tensile strength of the TC11 forging is lower than 1060MPa.
Claims (2)
1. A preparation method of a 1060MPa strength grade TC11 forging is characterized in that,
the TC11 forging raw material comprises the following components in percentage by mass: 7.0% of Al, 3.0% of Mo, 1.0% of Zr, 0.20% of Si, 0.025% of N, 0.01% of H, 0.04% of C, 0.10% of Fe, 0.05% of O, 0.01% of unavoidable impurities, and the balance Ti;
the preparation method comprises the following steps:
(1) Forging the TC11 titanium alloy at a forging heating temperature of (T) β -30)~(T β -50) ° c, the strain value of the TC11 forging body should be not less than 0.25 when the last fire deforms;
(2) And (3) performing heat treatment, wherein the effective thickness of the TC11 forge piece is controlled within 75-180mm before the heat treatment, the heat treatment comprises primary annealing and secondary annealing, the annealing temperature of the primary annealing is 950 ℃, and is 1-2 hours, and the annealing temperature of the secondary annealing is 520 ℃, and is 5-6 hours.
2. The method of claim 1 for preparing the 1060MPa strength grade TC11 forging, wherein the method comprises the following steps: the annealing time of the primary annealing is 1.5h, and the annealing time of the secondary annealing is 6h.
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