固溶冷却方式对Ti150合金组织及性能的影响  

Effect of solution cooling on microstructure and properties of Ti150 alloy

作　　者：瞿兆银 王清 白家元 牟旭祥 刘至唯 QU Zhaoyin;WANG Qing;BAI Jiayuan;MU Xuxiang;LIU Zhiwei(Guizhou Aviation Technical Development Co.,Ltd.,Guiyang 550081,Guizhou,China)

机构地区：[1]贵州航宇科技发展股份有限公司,贵州贵阳550081

出　　处：《金属加工(热加工)》2025年第4期40-43,47,共5页MW Metal Forming

摘　　要：主要研究了不同固溶冷却方式对Ti150合金组织及力学性能的影响。通过采用不同的热处理制度对Ti150合金试样分别进行热处理,然后对试样的室温拉伸、高温拉伸、硬度、金相组织及高温蠕变进行测试与分析。结果表明:不同的固溶冷却方式对材料的金相组织及力学性能有明显影响。随着冷却速度的降低,Ti150合金的强度逐渐降低,固溶水冷时,室温抗拉强度达1176MPa,空冷时降至1027MPa;塑性逐渐提升,室温伸长率由水冷时的8.4%升高到空冷时的14.1%;硬度方面,不仅随着固溶冷却速度的降低而降低,而且相同制度下试样心部硬度也明显低于表面硬度。结论认为:这是由于Ti150合金具有较强的固溶强化效应,固溶冷却速度越慢,合金元素扩散越充分,初生α相逐渐长大,次生α相板条变粗,位错密度降低,所以强度、硬度降低,抗蠕变能力变差;反之,固溶冷却速度越快,强度、硬度越高,因此,要想获得较高的强度及抗蠕变能力,固溶宜采用水冷。This article mainly studies the effects of different solution cooling methods on the structure and mechanical properties of Ti150 alloy were studied.The Ti150 alloy sample was heat treated by different heat treatment methods,and then the temperature tensile,high temperature tensile,hardness,microstructure and high temperature creep of the sample were tested and analyzed.The results show that different solution cooling methods have obvious effects on the microstructure and mechanical properties of the material.With the decrease of the cooling rate,the strength of Ti150 alloy gradually decreases.The tensile strength of Ti150 alloy at room temperature reaches 1176MPa when it is cooled by solution water and 1027MPa when it is cooled by air.The plasticity gradually increased,and the tensile elongation at room temperature increased from 8.4% in water cooling to 14.1% in air cooling.In terms of hardness,it not only decreases with the decrease of the solution cooling rate,but also the core hardness of the sample under the same system is significantly lower than the surface hardness.Conclusion the analysis shows that Ti150 alloy has a strong solid solution strengthening effect,the slower the solid solution cooling rate,the more fully the alloying element diffusion,the primary α phase gradually grows,the secondary α phase slat thickens,the dislocation density decreases,so the strength and hardness decrease,and the creep resistance becomes worse.Conversely,the faster the solution cooling rate,the higher the strength and hardness,Therefore,in order to obtain high strength and creep resistance,water cooling should be used for solid solution.

关 键 词：固溶 硬度 扩散 蠕变 Α相 

分 类 号：TG156.9[金属学及工艺—热处理]