维普中文期刊产品整合服务

Effects of microstructure on fatigue crack propagation behavior in a bi-modal TC11 titanium alloy fabricated via laser additive manufacturing

查看全文 作　　者：Yafei [1,2]Wang;Rui [1,2]Chen;Xu [1,2]Cheng;Yanyan [1,2]Zhu;Jikui [1,3]Zhang;Huaming [1,2]Wang 高影响力作者 机构地区：[1]National Engineering Laboratory of Additive Manufacturing for Large Metallic Components, Beihang University;[2]School of Materials Science and Engineering, Beihang University;[3]School of Aeronautic Science and Engineering, Beihang University高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2019年第35卷第2期,共6页高影响力期刊 基　　金：supported by the Beijing Municipal Science & Technology Commission (Z171100000817002);the National Postdoctoral Program for Innovative Talents of China (BX201600010);the China Postdoctoral Science Foundation (2017M620014) 摘　　要：In this study, the crack propagation behaviors in the equiaxed and equiaxed-columnar grain regions of a heat-treated laser additive manufacturing(LAM) TC11 alloy with a special bi-modal microstructure are investigated. The results indicate that the alloy presents a special bi-modal microstructure that comprises a fork-like primary α(αp) phase surrounded by a secondary α colony(αs) in the α phase matrix after the heat treatment is completed. The samples demonstrate a fast crack growth rate with larger da/d N values through the equiaxed grain sample versus across the equiaxed-columnar grain sample at low K values(<13.8). The differences that are observed between the crack propagation behaviors(in the crack initiation stage) of the samples can be mostly attributed to the different size and morphology of the αp lamellae and αscolony within the grains in the equiaxed and columnar grain regions rather than the grain boundaries. The cracks prefer to grow along the α/β boundary with a smooth propagation route and a fast propagation rate in the equiaxed grain region, where the αpand α clusters have a large size.However, in the columnar grain region, small and randomly distributed αplamellae generate a zigzagshaped propagation path with a reduction in the da/d N value. Additionally, the change in the size of the αp lamellae in the equiaxed grains(heat affected bands, HAB) is also observed to influence the propagation behavior of the crack during the crack initiation stage. 关 键 词：LASER additive manufacturing TC11 titanium alloy MICROSTRUCTURE FATIGUE CRACK propagation path FATIGUE CRACK growth rate
相关文献

参考文献(20)

引证文献(10)

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1　渝公网安备 50019002500403号　违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费