CN105445127A - Analysis method for grain size and fatigue strength relationship of titanium alloy based on additive manufacturing - Google Patents
Analysis method for grain size and fatigue strength relationship of titanium alloy based on additive manufacturing Download PDFInfo
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- CN105445127A CN105445127A CN201510849569.XA CN201510849569A CN105445127A CN 105445127 A CN105445127 A CN 105445127A CN 201510849569 A CN201510849569 A CN 201510849569A CN 105445127 A CN105445127 A CN 105445127A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
Abstract
The invention discloses an analysis method for a grain size and fatigue strength relationship of a titanium alloy based on additive manufacturing. The analysis method for the grain size and fatigue strength relationship of the titanium alloy based on the additive manufacturing comprises steps as follows: step 1, multiple groups of additive titanium alloys with different grain sizes are manufactured; step 2, the grain size of each to-be-measured titanium alloy piece is measured; step 3, an axial equal-amplitude cyclic fatigue test is performed, so that a stress life curve of each to-be-measured titanium alloy group is obtained; step 4, fatigue strength sigmaRi of the to-be-measured titanium alloy pieces in each to-be-measured titanium alloy group corresponding to a preset cycle number is acquired according to the corresponding stress life curve; step 5, a curve of the grain size and fatigue strength relationship of the titanium alloy based on the additive manufacturing is acquired through fitting. The additive manufacturing based titanium alloys with different grain sizes are manufactured with the analysis method for the grain size and fatigue strength relationship of the titanium alloy based on the additive manufacturing, and accordingly, a relationship between a microscopic structure size and the fatigue strength is established.
Description
Technical field
The present invention relates to titanium alloy technical field, being specifically related to a kind of based on increasing titanium alloy crystallite dimension and fatigue strength relationship analysis method and a kind of forging that material manufactures and based on the analytical approach increasing the titanium alloy relation that material manufactures.
Background technology
The static strength that 3D prints titanium alloy material is better than forging generally, but its microstructure and traditional handicraft material (as forging) have a great difference, present the trend of grain orientation growth, there is prism-frustum-shaped pattern in macroscopic material end face, coarse grains and crystal boundary is irregular, has a strong impact on the fatigue behaviour that 3D prints titanium alloy.
Grain size and fatigue strength cannot connect by prior art.
Therefore, wish a kind of technical scheme to overcome or at least alleviate at least one the problems referred to above of prior art.
Summary of the invention
A kind of titanium alloy crystallite dimension and fatigue strength relationship analysis method based on increasing material manufacture is the object of the present invention is to provide to overcome or at least alleviate at least one the problems referred to above of the prior art.
For achieving the above object, the invention provides a kind of titanium alloy crystallite dimension and fatigue strength relationship analysis method based on increasing material manufacture, the described titanium alloy crystallite dimension based on increasing material manufacture comprises the steps: step 1 from fatigue strength relationship analysis method: manufacture and organize the different increasing material titanium alloy of crystallite dimension more, thus form many groups titanium alloy group to be measured, wherein, often organize titanium alloy group to be measured and comprise the identical titanium alloy to be measured of multiple increasing material titanium alloy crystallite dimension; Step 2: the crystallite dimension measuring the titanium alloy each to be measured in each group of titanium alloy group to be measured; Step 3: for the titanium alloy each to be measured often organized in titanium alloy group to be measured carries out axial constant amplitude cycling fatigue experiment, thus often organized the stress-life of titanium alloy group to be measured; Step 4: by stress-life, obtains the fatigue strength σ of the titanium alloy to be measured in each titanium alloy group to be measured corresponding to predetermined circulation cycle
ri; Step 5: with the crystallite dimension often organizing titanium alloy group to be measured in described step 2 for horizontal ordinate, with fatigue strength σ during predetermined circulation cycle in the axial constant amplitude cycling fatigue experiment in described step 4
rifor ordinate, thus form a coordinate system, and on this coordinate system, mark the position often organizing horizontal ordinate corresponding to titanium alloy group to be measured and ordinate, and simulate a curve by the mode of matching, this curve is increase the relation curve that material manufactures titanium alloy crystallite dimension and fatigue strength.
Preferably, the increasing material titanium alloy mode that the manufacture in described step 1 organizes crystallite dimension different more is: manufacture by changing laser power when manufacturing and/or slicing layer thickness and/or powder feed rate and/or sweep velocity.
Preferably, the often group titanium alloy to be measured group in described step 1 comprises 25 titanium alloy to be measured.
Preferably, the measurement of crystallite dimension is carried out in described step 2 by scanning electron microscope.
Preferably, axial constant amplitude cycling fatigue experiment concrete steps in described step 3 are: divide into groups often organizing titanium alloy group to be measured again, thus often will organize titanium alloy component to be measured and become multiple titanium alloy group to be measured, the corresponding Primary Assay stress level of each titanium alloy group to be measured, the progression of proof stress level is identical with the quantity often organizing the titanium alloy group to be measured that titanium alloy group to be measured is divided into; Be respectively the stress that each titanium alloy group to be measured applies corresponding proof stress level, and record the circulation cycle of each titanium alloy to be measured fracture and fracture site and feature; Scanning electron microscope is utilized to detect tired source and the crack expansion characteristic of survey titanium alloy; According to the circulation cycle of titanium alloy fracture to be measured under obtained every grade proof stress level, simulate described stress-life.
Preferably, described proof stress level is divided into Pyatyi, is respectively: with σ
1=750MPa is as first order proof stress level, and decline 75MPa afterwards step by step, and level V stress level is σ
5=450MPa.
Preferably, the predetermined circulation cycle in described step 5 is 2 × 10
6cycle.
Present invention also offers a kind of forging with based on the analytical approach increasing the titanium alloy relation that material manufactures, described forging comprises the steps: step 1 with based on the analytical approach of the titanium alloy relation increasing material manufacture: utilizes as above based on increasing the titanium alloy crystallite dimension and fatigue strength relationship analysis method that material manufactures, thus the relation curve of acquisition increasing material manufacture titanium alloy crystallite dimension and fatigue strength; Step 2: manufacture the forging to be measured with the increasing material titanium alloy same size in described step 1; Step 3: utilize the axial constant amplitude cycling fatigue experiment of step 3 described in the titanium alloy crystallite dimension based on the manufacture of increasing material as above and fatigue strength relationship analysis method to obtain the fatigue strength σ of described forging to be measured when predetermined circulation cycle
ri; Step 4: the increasing material obtained in described step 1 manufactures the fatigue strength σ finding the forging to be measured in described step 3 in the relation curve of titanium alloy crystallite dimension and fatigue strength
ri, and find out this fatigue strength σ
rithe grain size of corresponding titanium alloy to be measured.
Titanium alloy crystallite dimension based on the manufacture of increasing material of the present invention and fatigue strength relationship analysis method produce the increasing material titanium alloy of various grain sizes by increasing material manufacture method, and carry out torture test mensuration fatigue strength respectively, analyze the relation set up between microstructure size and fatigue strength, obtain and increase the relation curve that material manufactures titanium alloy crystallite dimension and fatigue strength.Curve can be utilized according to the crystallite dimension increasing material manufacture titanium alloy material, obtain its fatigue strength, above solve and increase the deficient problem being difficult to design and using of material manufactured materials fatigue behaviour data.
Accompanying drawing explanation
Fig. 1 increases the relation curve that material manufactures titanium alloy crystallite dimension and fatigue strength according to an embodiment of the invention.
Fig. 2 be embodiment illustrated in fig. 1 in stress-life schematic diagram.
Embodiment
For making object of the invention process, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Described embodiment is the present invention's part embodiment, instead of whole embodiments.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.Below in conjunction with accompanying drawing, embodiments of the invention are described in detail.
In describing the invention; it will be appreciated that; term " " center ", " longitudinal direction ", " transverse direction ", "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", " outward " etc. instruction orientation or position relationship be based on orientation shown in the drawings or position relationship; be only the present invention for convenience of description and simplified characterization; instead of instruction or imply indication device or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limiting the scope of the invention.
Fig. 1 increases the relation curve that material manufactures titanium alloy crystallite dimension and fatigue strength according to an embodiment of the invention.Fig. 2 be embodiment illustrated in fig. 1 in stress-life schematic diagram.
The titanium alloy crystallite dimension based on the manufacture of increasing material as shown in Figures 1 and 2 comprises the steps: step 1 from fatigue strength relationship analysis method: manufacture and organize the different increasing material titanium alloy of crystallite dimension more, thus form many groups titanium alloy group to be measured, wherein, often organize titanium alloy group to be measured and comprise the identical titanium alloy to be measured of multiple increasing material titanium alloy crystallite dimension; Step 2: the crystallite dimension measuring the titanium alloy each to be measured in each group of titanium alloy group to be measured; Step 3: for the titanium alloy each to be measured often organized in titanium alloy group to be measured carries out axial constant amplitude cycling fatigue experiment, thus often organized the stress-life (Fig. 1) of titanium alloy group to be measured; Step 4: by stress-life, obtains the fatigue strength σ of the titanium alloy to be measured in each titanium alloy group to be measured corresponding to predetermined circulation cycle
ri; Step 5: with the crystallite dimension often organizing titanium alloy group to be measured in described step 2 for horizontal ordinate, with fatigue strength σ during predetermined circulation cycle in the axial constant amplitude cycling fatigue experiment in described step 4
rifor ordinate, thus form a coordinate system, and on this coordinate system, mark the position often organizing horizontal ordinate corresponding to titanium alloy group to be measured and ordinate, and simulate a curve by the mode of matching, this curve is increase the relation curve that material manufactures titanium alloy crystallite dimension and fatigue strength.
In the present embodiment, the increasing material titanium alloy mode that the manufacture in described step 1 organizes crystallite dimension different more is: manufacture by changing laser power when manufacturing and/or slicing layer thickness and/or powder feed rate and/or sweep velocity.Be understandable that, this of changing wherein of above-mentioned these parameters (laser power, slicing layer thickness, powder feed rate and sweep velocity) namely can change crystallite dimension.Therefore, or several wherein can be changed as required and voluntarily.
Advantageously, in order to be the interference prevented between parameters, select in the present embodiment wherein three parameters all to remain unchanged, the mode only changing wherein is tested.
In the present embodiment, the often group titanium alloy to be measured group in described step 1 comprises 25 titanium alloy to be measured.Be understandable that, this quantity can sets itself as required.Such as, 30,40 or more.
In the present embodiment, the measurement of crystallite dimension is carried out in described step 2 by scanning electron microscope.
In the present embodiment, axial constant amplitude cycling fatigue experiment concrete steps in described step 3 are: divide into groups often organizing titanium alloy group to be measured again, thus often will organize titanium alloy component to be measured and become multiple titanium alloy group to be measured, the corresponding Primary Assay stress level of each titanium alloy group to be measured, the progression of proof stress level is identical with the quantity often organizing the titanium alloy group to be measured that titanium alloy group to be measured is divided into; Be respectively the stress that each titanium alloy group to be measured applies corresponding proof stress level, and record the circulation cycle of each titanium alloy to be measured fracture and fracture site and feature; Scanning electron microscope is utilized to detect tired source and the crack expansion characteristic of survey titanium alloy; According to the circulation cycle of titanium alloy fracture to be measured under obtained every grade proof stress level, simulate stress-life.
In the present embodiment, described proof stress level is divided into Pyatyi, is respectively: with σ
1=750MPa is as first order proof stress level, and decline 75MPa afterwards step by step, and level V stress level is σ
5=450MPa.
Be understandable that, the hierarchical approaches of above-mentioned proof stress level can sets itself as required.When in step 1 often organize titanium alloy number to be measured in titanium alloy group to be measured less time, correspondingly can reduce classification.When number is more, can corresponding increase classification.
Be understandable that, the selection of the stress value in this classification is with conceivable or think that fatigue strength is as a comparison for standard.Such as, when conceivable or think that fatigue strength is as a comparison σ
r=561MPa, just selects above-mentioned hierarchical approaches.
In the present embodiment, the predetermined circulation cycle in step 5 is 2 × 10
6cycle.Be appreciated that ear is, the selection of this predetermined fantasy cycle can be selected as required and voluntarily.Such as, 2 × 10
5cycle, 2 × 10
3week is inferior.
Present invention also offers a kind of forging with based on the analytical approach increasing the titanium alloy relation that material manufactures, described forging comprises the steps: step 1 with based on the analytical approach of the titanium alloy relation increasing material manufacture: utilizes as above based on increasing the titanium alloy crystallite dimension and fatigue strength relationship analysis method that material manufactures, thus the relation curve of acquisition increasing material manufacture titanium alloy crystallite dimension and fatigue strength; Step 2: manufacture the forging to be measured with the increasing material titanium alloy same size in step 1; Step 3: utilize the axial constant amplitude cycling fatigue experiment of step 3 described in the titanium alloy crystallite dimension based on the manufacture of increasing material as above and fatigue strength relationship analysis method to obtain the fatigue strength σ of described forging to be measured when predetermined circulation cycle
ri; Step 4: the increasing material obtained in described step 1 manufactures the fatigue strength σ finding the forging to be measured in described step 3 in the relation curve of titanium alloy crystallite dimension and fatigue strength
ri, and find out this fatigue strength σ
rithe grain size of corresponding titanium alloy to be measured.
Adopt in this way, can in conjunction with the crystallite dimension of forged titanium alloy and fatigue strength, establish the relation between increasing material manufacture titanium alloy fatigue behaviour and forged titanium alloy fatigue performance and performance parameter modification method, the titanium alloy material strength design of classics is extended to and increases material titanium alloy material.Solve and increase material titanium alloy material use experience and lack, and it is oversize to set up time of system by extensive work, does not meet the problem of existing increasing material titanium alloy application level.
For the ease of understanding the present invention, by way of example the present invention is further elaborated below.Be understandable that, this citing does not form any limitation of the invention.
With reference to method of the present invention, prepare testpieces, and divide into groups, utilize scanning electron microscope to carry out the microscopic examination of each group of testpieces, measure the crystallite dimension d of each testpieces
iand record.
Carry out torture test according to testing requirements, according to the data that test obtains, make the stress-life of testpieces, and on curve, find circulation cycle 2 × 10
6corresponding σ
r1.
Take crystallite dimension as horizontal ordinate, with fatigue strength σ
rifor ordinate, mark out the point that each group of testpieces is corresponding in a coordinate system, and simulate the relation curve (Fig. 1) increasing material manufactured materials crystallite dimension and fatigue strength, and on curve, mark out increasing material titanium alloy crystallite dimension corresponding to forged titanium alloy.
Finally it is to be noted: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit.Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (8)
1. based on the titanium alloy crystallite dimension and the fatigue strength relationship analysis method that increase material manufacture, it is characterized in that, described titanium alloy crystallite dimension and fatigue strength relationship analysis method based on increasing material manufacture comprises the steps:
Step 1: manufacture the increasing material titanium alloy that many group crystallite dimensions are different, thus form many groups titanium alloy group to be measured, wherein, often organize titanium alloy group to be measured and comprise the identical titanium alloy to be measured of multiple increasing material titanium alloy crystallite dimension;
Step 2: the crystallite dimension measuring the titanium alloy each to be measured in each group of titanium alloy group to be measured;
Step 3: for the titanium alloy each to be measured often organized in titanium alloy group to be measured carries out axial constant amplitude cycling fatigue experiment, thus often organized the stress-life of titanium alloy group to be measured;
Step 4: by stress-life, obtains the fatigue strength σ of the titanium alloy to be measured in each titanium alloy group to be measured corresponding to predetermined circulation cycle
ri;
Step 5: with the crystallite dimension often organizing titanium alloy group to be measured in described step 2 for horizontal ordinate, with fatigue strength σ during predetermined circulation cycle in the axial constant amplitude cycling fatigue experiment in described step 4
rifor ordinate, thus form a coordinate system, and on this coordinate system, mark the position often organizing horizontal ordinate corresponding to titanium alloy group to be measured and ordinate, and simulate a curve by the mode of matching, this curve is increase the relation curve that material manufactures titanium alloy crystallite dimension and fatigue strength.
2. as claimed in claim 1 based on the titanium alloy crystallite dimension and the fatigue strength relationship analysis method that increase material manufacture, it is characterized in that, the increasing material titanium alloy mode that the manufacture in described step 1 organizes crystallite dimension different more is: manufacture by changing laser power when manufacturing and/or slicing layer thickness and/or powder feed rate and/or sweep velocity.
3., as claimed in claim 2 based on the titanium alloy crystallite dimension and the fatigue strength relationship analysis method that increase material manufacture, it is characterized in that, the often group titanium alloy to be measured group in described step 1 comprises 25 titanium alloy to be measured.
4., as claimed in claim 1 based on the titanium alloy crystallite dimension and the fatigue strength relationship analysis method that increase material manufacture, it is characterized in that, in described step 2, carried out the measurement of crystallite dimension by scanning electron microscope.
5., as claimed in claim 1 based on the titanium alloy crystallite dimension and the fatigue strength relationship analysis method that increase material manufacture, it is characterized in that, the axial constant amplitude cycling fatigue experiment concrete steps in described step 3 are:
Divide into groups often organizing titanium alloy group to be measured again, thus often will organize titanium alloy component to be measured and become multiple titanium alloy group to be measured, the corresponding Primary Assay stress level of each titanium alloy group to be measured, the progression of proof stress level is identical with the quantity often organizing the titanium alloy group to be measured that titanium alloy group to be measured is divided into;
Be respectively the stress that each titanium alloy group to be measured applies corresponding proof stress level, and record the circulation cycle of each titanium alloy to be measured fracture and fracture site and feature;
Scanning electron microscope is utilized to detect tired source and the crack expansion characteristic of survey titanium alloy;
According to the circulation cycle of titanium alloy fracture to be measured under obtained every grade proof stress level, simulate described stress-life.
6., as claimed in claim 5 based on the titanium alloy crystallite dimension and the fatigue strength relationship analysis method that increase material manufacture, it is characterized in that, described proof stress level is divided into Pyatyi, is respectively: with σ
1=750MPa is as first order proof stress level, and decline 75MPa afterwards step by step, and level V stress level is σ
5=450MPa.
7., as claimed in claim 6 based on the titanium alloy crystallite dimension and the fatigue strength relationship analysis method that increase material manufacture, it is characterized in that, the predetermined circulation cycle in described step 5 is 2 × 10
6cycle.
8. forging with based on the analytical approach increasing the titanium alloy relation that material manufactures, it is characterized in that, described forging and comprising the steps: based on the analytical approach of the titanium alloy relation increasing material manufacture
Step 1: utilize as claimed in any of claims 1 to 7 in one of claims based on the titanium alloy crystallite dimension and the fatigue strength relationship analysis method that increase material manufacture, thus acquisition increases the relation curve that material manufactures titanium alloy crystallite dimension and fatigue strength;
Step 2: manufacture the forging to be measured with the increasing material titanium alloy same size in described step 1;
Step 3: utilize the axial constant amplitude cycling fatigue experiment of step 3 described in the titanium alloy crystallite dimension based on the manufacture of increasing material as claimed in any of claims 1 to 7 in one of claims and fatigue strength relationship analysis method to obtain the fatigue strength σ of described forging to be measured when predetermined circulation cycle
ri;
Step 4: the increasing material obtained in described step 1 manufactures the fatigue strength σ finding the forging to be measured in described step 3 in the relation curve of titanium alloy crystallite dimension and fatigue strength
ri, and find out this fatigue strength σ
rithe grain size of corresponding titanium alloy to be measured.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106947856A (en) * | 2017-04-06 | 2017-07-14 | 广东工业大学 | The manufacture method and intensifying method of a kind of member for prolonging service life |
| CN107451377A (en) * | 2017-08-31 | 2017-12-08 | 北京航空航天大学 | A kind of crystallite dimension modification method of Aviation turbine engine disk structural life-time analysis |
| CN111678821A (en) * | 2020-06-23 | 2020-09-18 | 山东大学 | Low-cycle fatigue life prediction method based on high-temperature alloy processing surface integrity |
| CN112632720A (en) * | 2020-12-16 | 2021-04-09 | 广东省科学院中乌焊接研究所 | Multidimensional data fusion and quantitative modeling method for metal additive manufacturing process system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112632720A (en) * | 2020-12-16 | 2021-04-09 | 广东省科学院中乌焊接研究所 | Multidimensional data fusion and quantitative modeling method for metal additive manufacturing process system |
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Application publication date: 20160330 |