拉伸速率和转速位置对Nb47Ti合金拉伸测试的影响  

Effect of Tensile Rate and Rate Shift Point on Tensile Test of Nb47Ti Alloy

作　　者：王玺玉 李芹芹 高慧贤[1] 樊智涛 罗文忠[1] 刘向宏[1] Wang Xiyu;Li Qinqin;Gao Huixian;Fan Zhitao;Luo Wenzhong;Liu Xianghong(Western Superconducting Technology Co.,Ltd.,Xi'an 710018,China)

机构地区：[1]西部超导材料科技股份有限公司,陕西西安710018

出　　处：《钛工业进展》2024年第5期33-37,共5页Titanium Industry Progress

摘　　要：利用万能试验机研究了拉伸速率和转速位置对Nb47Ti合金拉伸测试的影响,通过计算其真应力-应变曲线、加工硬化指数(n)和应变速率敏感系数(m)分析了Nb47Ti合金的力学行为。结果表明:Nb47Ti合金加工硬化能力十分有限,其屈强比接近1;随着拉伸速率的提高,加工硬化效果进一步减弱;拉伸速率对强度的影响较为显著,根据恒速率拉伸法计算其应变速率敏感系数为0.0263。转速试验中,随着拉伸速率的转换,应力值骤增。在加工硬化阶段的不同应变处转速时,突变幅值相对稳定,但整体随着应变量的增加而降低。本研究可为Nb47Ti合金拉伸测试时拉伸速率和转速点等参数的选取提供参考。The effects of tensile rate and rate shift point on tensile test of Nb47Ti alloy were studied by universal testing machine.The mechanical behavior of Nb47Ti alloy was analyzed by calculating true stress-strain curve,work hardening coefficient(n)and strain rate sensitivity coefficient(m).The results show that the work hardening ability of Nb47Ti alloy is very limited,and the ratio of yield strength to tensile strength approaching 1.With the increase of tensile rate,the work hardening effect decreases further.The tensile rate has a significant effect on strength,the strain rate sensitivity coefficient calculated by constant rate tensile method is 0.0263.In the two-stage tensile test,the stress value changes abruptly with the conversion of tensile rate,and the amplitude of abrupt change is relatively constant when transitions rate at different strains in work hardening stage,but it decreases with the increase of strain on the whole.This study can provide references for the selection of tensile rate and rate shift point during tensile test of Nb47Ti alloy.

关 键 词：Nb47Ti合金 应变速率敏感系数 拉伸速率 加工硬化指数 转速位置 

分 类 号：TG146.23[一般工业技术—材料科学与工程]