冷轧及热处理对一种亚稳β型钛合金组织及性能的影响  

Effect of Cold Rolling and Heat Treatment on Microstructure and Properties of MetastableβTitanium Alloy

作　　者：王艳晶[1] 袁晨航 徐再东 徐荣正[1] 马寰宸 张文东 Wang Yanjing;Yuan Chenhang;Xu Zaidong;Xu Rongzheng;Ma Huanchen;Zhang Wendong(Shenyang Aerospace University,Shenyang 110136,China)

机构地区：[1]沈阳航空航天大学,辽宁沈阳110136

出　　处：《稀有金属材料与工程》2023年第1期238-244,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51601121)。

摘　　要：利用光学显微镜(OM)、X射线衍射仪(XRD)、扫描电镜(SEM)及室温拉伸等试验方法研究了单次冷轧退火、三次冷轧退火以及后续时效工艺对自主设计的亚稳β型钛合金Ti-7.46V-5Mo-3.13Cr-1Zr-3Al的显微组织及力学性能的影响。结果表明:与单次冷轧退火相比,三次冷轧退火后合金晶粒更加细小,强度塑性均有提高,屈服强度达到815 MPa,延伸率为27%。样品经单次冷轧退火和时效处理后,析出弥散细小的次生α相,合金屈服强度达到1280 MPa并且屈服强度随时效时间的增加呈先增加后减小的趋势,总体呈现较高的强度和较低的延伸率;而经三次冷轧退火和时效后的样品屈服强度略低,但塑性显著提高,具有较好的强度和塑性匹配。综合比较实验结果,可以确定本次实验中合金经过三次800℃/20 min冷轧退火和500℃/10 h时效后能达到良好的强度和塑性匹配,其抗拉强度为1380 MPa,延伸率为10.8%。The effects of single cold rolling annealing, triple cold rolling annealing and subsequent aging on the microstructure and mechanical properties of self-designed metastable β titanium alloy Ti-7.46V-5Mo-3.13Cr-1Zr-3Al were investigated by optical microscope(OM), X-ray diffractometer(XRD), scanning electron microscope(SEM) and room temperature tensile tests. The results show that compared with single cold rolling annealing, the grain size of the alloy after triple cold rolling annealing is finer, the strength and plasticity are improved, the yield strength reaches 815 MPa and the elongation is 27%. After single cold rolling annealing and aging treatment, the fine and dispersed secondary α phase is precipitated, the yield strength of the alloy reaches 1280 MPa, and the yield strength increases at first and then decreases with the increase of aging time, showing higher strength and lower elongation. However,the strength of the sample after triple cold rolling annealing and aging is slightly lower, but the plasticity is significantly improved, and it has a better match between strength and plasticity. Based on the comprehensive comparison of the experimental results, it can be determined that the alloy can achieve a good match of strength and plasticity after triple cold rolling annealing at 800 ℃/20 min and aging at 500 ℃/10 h, the tensile strength is 1380 MPa and the elongation is 10.8%.

关 键 词：亚稳β型钛合金 冷轧退火 时效处理 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]