锻压技术

不同应变速率和脉冲电压下0.3%置氢Ti-6Al-4V钛合金压缩变形力学分析

英文标题：Mechanical analysis on compressive deformation of Ti-6Al-4V titanium alloy with 0.3% hydrogen under different strain rates and pulse voltages

作者：陈伟

单位：浙江工业职业技术学院

关键词：Ti-6Al-4V钛合金脉冲电压压缩变形置氢准解理穿晶断裂

分类号：TG146

出版年,卷(期):页码：2019,44(1):161-165

摘要：

利用固态充氢法制备0.3%置氢的Ti-6Al-4V钛合金，在万能力学测试机上研究应变速率和脉冲电压对其压缩变形行为的影响。研究结果表明：0.3%置氢Ti-6Al-4V钛合金的微观组织相对于未置氢钛合金组织形态发生了明显改变。当施加脉冲电压后，钛合金的伸长率都发生了大幅提高，随着电压升高到80 V时，0.3%置氢钛合金具有显著高于未置氢钛合金的屈服强度。当应变量增加后，钛合金压缩过程中温度发生先升后降的变化。当对钛合金施加脉冲电压后，会形成大量浅韧窝，对0.3%置氢Ti-6Al-4V钛合金施加脉冲电压后可以提高其塑性，发生准解理穿晶断裂。

The Ti-6Al-4V titanium alloy with 0.3% hydrogen was prepared by the solid hydrogen filling method, and the influences of strain rate and pulse voltage on its compressive deformation behavior were studied by the universal mechanical testing machine. The results show that the microstructure of Ti-6Al-4V titanium alloy with 0.3% hydrogen changes significantly compared with that of the titanium alloy without hydrogen. When the pulse voltage is applied, the elongations of titanium alloy both increase greatly, and when the voltage increases to 80 V, the titanium alloy with 0.3% hydrogen has a significantly lower yield strength than that of the titanium alloy without hydrogen. When the strain increases, the temperature of titanium alloy increases firstly and then decreases during the compression process. And when the pulse voltage is applied to the titanium alloy, many shallow dimples are formed. Thus, the pulse voltage applied to the Ti-6Al-4V titanium alloy with 0.3% hydrogen can improve its plasticity and produce quasi-cleavage transcrystalline fracture.

基金项目：

国家基金重大科研仪器研制项目（4142780076）

陈伟（1989－），男，硕士，助教，E-mail：545338971@qq.com

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