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研究了在β相区(830℃)短时间固溶及时效处理对Ti-Al-Mo-V-Cr-Nb钛合金显微组织和室温拉伸性能的影响。结果表明:经过短时固溶和525℃时效4 h,随着固溶时间从2 min延长到15 min,合金中微米尺度等轴初生α相(αp相)的数量减少,面积分数从3.8%下降到0.18%,β晶粒平均直径从6.7μm增加到11.9μm,抗拉强度从1456 MPa增加到1491 MPa,屈服强度从1390 MPa增加到1424 MPa,断后伸长率从8.5%下降到4.2%,塑性显著降低;随着短时固溶时间的延长,合金在拉伸过程中裂纹萌生位置由αp相边界处萌生转向晶界处萌生,断口由韧窝型断口转为准解理断口。
Abstract：Effect of short-time solution treatment in the β phase region( 830 ℃) and aging treatment on microstructure and room temperature tensile properties of Ti-Al-Mo-V-Cr-Nb titanium alloy was studied. The results show that after short-time solution treatment and aging at 525 ℃ for 4 h, as the solution treatment time increases from 2 min to 15 min, the number of micron scale equiaxed primary α phase(αP phase) of the alloy decreases, its area fraction decreases from 3. 8% to 0. 18%, the average diameter of β grains increases from 6. 7 μm to 11. 9 μm, the tensile strength increases from 1456 MPa to 1491 MPa, the yield strength increases from 1390 MPa to 1424 MPa, and the elongation decreases from 8. 5% to 4. 2%, showing the plasticity significantly decreases. With the increase of shorttime solution treatment time, the crack initiation position of the alloy during the tensile shifts from the αP phase boundary to the grain boundary, and the fracture surface changes from a ductile dimple fracture to a quasi-cleavage fracture.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2024-0370
中图分类号:TG146.23;TG156.9
引用信息:
[1]邢浩洲,刘乐梁,刘继雄等.单相区短时固溶及时效处理对亚稳β钛合金组织和拉伸性能的影响[J].材料热处理学报,2025,46(06):61-69.DOI:10.13289/j.issn.1009-6264.2024-0370.
基金信息: