Slip-driven and weld pore assisted fatigue crack nucleation in electron beam welded TC17 titanium alloy joint,International Journal of Fatigue

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Slip-driven and weld pore assisted fatigue crack nucleation in electron beam welded TC17 titanium alloy joint
International Journal of Fatigue ( IF 5.7 ) Pub Date : 2021-09-06 , DOI: 10.1016/j.ijfatigue.2021.106525
Hanqing Liu _{1,

2} , Jun Song ₁ , Haomin Wang ₃ , Chuanli Yu ₁ , Yaohan Du ₁ , Chao He ₁ , Qingyuan Wang ₁ , Qiang Chen ₂

Affiliation

High cycle and very high cycle fatigue (VHCF) crack initiation mechanism of TC17 alloy joint with heterogeneous microstructures in FZ has been studied at the stress ratio of 0.1. Intrinsic deficiencies of slip deformation in β grains with few martensites and cracking coarse grain boundary between prior β grains with martensite colonies account for the high cycle fatigue (HCF) of joints. The average diameter of intergranular welding pores regarding VHCF crack nucleation is measured to be ∼36 μm. The driving force governing the crack nucleation from intrinsic deficiencies in HCF to porosity defects in VHCF is ∼1.66 MPa·m^1/2.

中文翻译：

电子束焊接TC17钛合金接头滑移驱动和焊缝辅助疲劳裂纹形核

研究了应力比为 0.1 时 FZ 非均质组织 TC17 合金接头的高周和甚高周疲劳 (VHCF) 裂纹萌生机制。具有少量马氏体的 β 晶粒中滑动变形的固有缺陷和具有马氏体群的先前 β 晶粒之间的粗晶界开裂是接头的高周疲劳（HCF）的原因。测得的 VHCF 裂纹形核的晶间焊孔平均直径为~36 μm。从 HCF 的固有缺陷到 VHCF 的孔隙缺陷，控制裂纹成核的驱动力为 1.66 MPa·m ^1/2。

更新日期：2021-09-20

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