TC17钛合金在α+β两相区加热过程中片状组织的粗化行为  

Coarsening Behavior of Lamellar Microstructure of TC17 Titanium Alloy During Heating Processing in α + β Phase Field

作　　者：王云利 赵兴东 徐建伟[2] 曾卫东[2] Wang Yunli;Zhao Xingdong;Xu Jianwei;Zeng Weidong(AECC Shenyang Liming Aero-engine Co.,Ltd.,Shenyang 110043,China;State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]中国航发沈阳黎明航空发动机有限责任公司,辽宁沈阳110043 [2]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《钛工业进展》2018年第3期30-33,共4页Titanium Industry Progress

基　　金：国家重点研发计划项目(2016YFB0301203)

摘　　要：研究了TC17钛合金分别在800℃和840℃两相区加热过程中片状组织的粗化行为。结果表明,随着加热时间的延长,片状组织逐渐粗化,粗化速率逐渐降低。片状α相的粗化过程是一个元素扩散过程,元素从势能较高的片状组织末端或缺陷位置向势能较低的平滑位置迁移,导致片状α相粗化。经计算,800℃下粗化指数为0.37,840℃下粗化指数为0.42,根据LSW粗化理论,TC17钛合金片状组织的粗化行为由体扩散和界面反应共同控制。此外,基于Gibbs-Thompson理论,建立了TC17钛合金片状组织的粗化速率预测模型。The coarsening behavior of TC17 titanium alloy at 800℃and 840℃was investigated in this research.The results show that the thickness of alpha lamellae continues to increase with heat treatment time.However,the coarsening rate decreases with heat treatment time.The coarsening of alpha lamellae is a process of element diffusion.Elements will migrate from the large curvature(the termination or defect position)to the small curvature(the flat interface),which leads to the dissolution of the termination tip and the coarsening of the adjacent plate.The coarsening index is calculated as 0.37 and 0.42 for 800℃and 840℃.According to the LSW theory,the coarsening behavior of TC17 titanium alloy is controlled by bulk diffusion and interface reaction.The prediction model of coarsening rate of TC17 titanium alloy is successfully established based on Gibbs-Thompson theory.

关 键 词：TC17钛合金 两相区加热 粗化行为 

分 类 号：TG146.23[一般工业技术—材料科学与工程]