摘要
通过形变结合热处理细化铸态Ti-6Al-4V钛合金的组织。首先将铸态Ti-6Al-4V钛合金在1100℃下进行固溶处理并水冷使组织转变为马氏体,然后采用750℃反复轧制的方式,将组织细化。研究分析表明,相关微观组织细化原理为:形变孪晶、位错重排、晶体旋转以及非连续动态再结晶。通过拉伸性能测试,发现相比铸态Ti-6Al-4V钛合金,经组织细化处理的合金具有较好的强塑性匹配关系。合金强度的提升是细晶强化以及位错强化共同作用的结果。塑性的提升是由于裂纹萌生并扩展时,裂纹尖端形成塑性区,从而阻碍裂纹扩展提升材料的塑性。此外,位错可在α相和β相之间完成滑移传递,从而能较好地协调α相和β相之间的变形,进一步提升材料的塑性。
Microstructure of the as-cast Ti-6Al-4V titanium alloy was refined by deformation combined with heat treatment.Firstly,the as-cast Ti-6Al-4V titanium alloy was subjected to solution treatment at 1100℃and water cooling to transform the microstructure into martensite.Then,the microstructure was refined by repeated rolling at 750℃.The results show that the principles of microstructure refinement are the deformation twinning,dislocation rearrangement,crystal rotation and discontinuous dynamic recrystallization.Through tensile test,it is found that compared to the as-cast Ti-6Al-4V titanium alloy,the alloy treated with microstructure refinement has a better strength-plasticity matching relationship.The improvement of alloy strength is the result of the combined effect of fine grain strengthening and dislocation strengthening.The improvement of plasticity is due to the formation of a plastic zone at the crack tip during crack initiation and propagation,which hinders crack propagation and enhances the plasticity of the material.In addition,dislocations can complete slip transmission between theαandβphases,which can better coordinate the deformation between theαandβphases and further enhance the plasticity of the material.
作者
孙皓
蒙迅
Sun Hao;Meng Xun(Advanced Batteries and Materials Engineering Research Center,Guizhou Light Industry Technical College,Guiyang Guizhou 550025,China;Guizhou Yonghong Heat Transfer&Cooling Technology Co.,Ltd.,Qiannan Guizhou 550601,China)
出处
《金属热处理》
北大核心
2025年第2期52-60,共9页
Heat Treatment of Metals
基金
贵州轻工职业技术学院项目(24QYGCC01)。
