Ti-6Al-4V合金板材在电脉冲辅助弯曲过程中的显微组织演变及成形性能

扫码查看

原文链接

万方数据

中文摘要：在有效电流密度为0～3.2 A/mm2、占空比为10％～70％条件下对Ti-6Al-4V合金板材进行电脉冲辅助弯曲实验.结果表明:当有效电流密度从0增加到2.4A/mm2时,弯曲成形位移从9.15 mm增加到15.60 mm;同时,裂纹的尺寸和宽度减小.此外,当弯曲位移为8 mm时,回弹角随着有效电流密度的增加而减小.占空比同样影响弯曲角,在30％占空比条件下能获得最小的弯曲角135.0°.板材的热稳定温度随着有效电流密度的增加而增加,但是与占空比呈非线性关系.此外,在电脉冲辅助弯曲过程中出现了晶粒粗化、{0001｝织构强度增加和亚晶粒发展.电脉冲使位错密度降低且加速位错的重排,促进α晶粒内亚晶粒的形成,从而改善合金的成形性.电脉冲的非热效应提高了 Ti-6Al-4V合金板材的低温成形性,使其与高温下的成形效果类似.

外文标题：Microstructural evolution and formability of Ti-6Al-4V alloy sheet during electropulsing-assisted bending

外文摘要：The electropulsing-assisted bending test was carried out on Ti-6Al-4V alloy sheet with the effective current density of 0-3.2 A/mm2 and duty ratio of 10％-70％.The results show that the bending forming displacement increased from 9.15 to 15.60 mm with increasing effective current density from 0 to 2.4 A/mm2.The crack changed to be shallow and small at the same time.Besides,the springback angle decreased as the effective current density increased at the bending displacement of 8 mm.Duty ratio also affected bending angle,where 30％duty ratio led to the lowest bending angle of 135.0°.The thermal stability temperature increased with increasing effective current density and varied non-monotonically with duty ratio.In addition,grain coarsening,{0001} texture strengthening and sub-grain development were observed during electropulsing-assisted bending.The electropulsing decreased dislocation density and accelerated dislocation rearrangement,the rearranged and piled-up dislocation inside α grains promoted sub-grain structure formation,which improved the formability.The contribution of athermal effect made the low-temperature formability of Ti-6Al-4V alloy comparable to that at high temperature.

外文关键词：

Ti-6Al-4V alloy sheetmicrostructural evolutionformabilityelectropulsing-assisted bendingspringbackdislocationathermal effect

作者：

孟令健、殷宏亮、朱岩、崔晓磊、林鹏

展开 >

作者单位：

太原理工大学材料科学与工程学院,太原 030024

哈尔滨工业大学金属精密热加工国家重点实验室,哈尔滨 150001

太原理工大学先进金属复合材料成形技术与装备教育部工程研究中心,太原 030024

关键词：

Ti-6Al-4V合金板材显微组织演变成形性电脉冲辅助弯曲回弹位错非热效应

基金：

National Natural Science Foundation of ChinaApplied Basic Research Program of Shanxi Province,ChinaApplied Basic Research Program of Shanxi Province,China

项目编号：

515053232021030212311720210302124658

出版年：

2024

DOI：

10.1016/S1003-6326(23)66414-3

中国有色金属学报(英文版)

中国有色金属学会

中国有色金属学报(英文版)

CSTPCD

影响因子：1.183

ISSN：1003-6326

年,卷(期)：2024.34(2)