摘要
合理的锻造工艺能显著影响β钛合金的组织和性能。利用金相显微镜(OM)、扫描电镜(SEM)和显微硬度计研究了β锻造、α+β锻造两种工艺对新型β钛合金BTi20的显微组织和室温拉伸性能的影响。结果表明:β锻合金的锻态组织为均匀的等轴β晶粒,α+β锻合金的锻态组织为等轴初生α相和β相,两种合金锻态的强度均在1500 MPa级以上,伸长率7%左右;相变点下固溶后,两种合金中均析出了等轴状初生α相,β锻合金中初生相的体积分数高于α+β锻合金,且分布更均匀,相变点上固溶后,β锻合金中的晶粒平均尺寸大于α+β锻合金,前者强度高于后者,塑性反之;相变点下固溶时效后,β锻合金中短棒状的初生相分布更均匀,次生相尺寸更细小,强度高于两相锻合金,但塑性较低;相变点上固溶时效后,α+β锻合金的网篮组织更均匀,强度高于β锻合金,塑性相差无几,即固溶时效处理后,α+β锻合金的强塑性匹配优于β锻合金。
Reasonable forging process could significantly affect the microstructure and mechanical properties of beta titanium alloy. The effects of β forging process and α+β forging process on the microstructure and room temperature tensile properties of a new β titanium alloy BTi20 were studied by metallographic microscope(OM), scanning electron microscope(SEM) and microhardness tester. The results showed that the forged microstructure of β forging alloy has uniform equiaxed β grains, and the α+β forging alloy was equiaxed primary α and β phases. The strength of the two alloy was above 1500 MPa and the elongation was about 7%. After solution below the transformation point, the equiaxed primary α phase was precipitated in both alloys. The volume fraction of primary phase in β forging alloy was higher than that of α+β forging alloy, and the distribution was more uniform. After solution above the transformation point, the average grain size in β forging alloy was larger than that of α+β forging alloy. The strength of the former was higher than that of the latter, whereas the plasticity was not. After the(α+β) solution and aging treatment, the distribution of the primary short-rod α phase in β forging alloy was more uniform, and the size of the secondary α phase was smaller and the strength was higher than that of the α+β forging alloy, but the plasticity was lower. After the β phase zone solution and aging treatment, α+β forging alloy has more uniform basket weave microstructure and higher strength than the β forging alloy. But the plasticity was almost the same. That is, after the solution and aging treatment, the strength and plasticity of α + β forging alloy was better than that of β forging alloy.
作者
王庆娟
双翼翔
孙亚玲
王文
王伟
Wang Qingjuan;Shuang Yixiang;Sun Yaling;Wang Wen;Wang Wei(College of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2019年第1期32-37,共6页
Chinese Journal of Rare Metals
基金
国家重点研发计划项目(2017YFB0306200)
陕西省工业科技攻关项目(2016GY-207)资助
关键词
BTi20钛合金
锻造工艺
热处理
显微组织
力学性能
BTi20 titanium alloy
forging process
heat treatment
microstructure
mechanical properties
作者简介
王庆娟(1973-),女,辽宁大连人,博士,教授,研究方向:钛合金,电话:13992855295,E-mail:jiandawqj@163.com.
