Residual stress effects on the propagation of fatigue cracks in the weld of a CA6NM stainless steel
The fatigue crack growth behavior in an automatic flux core arc weld was investigated for stainless steel alloy CA6NM.As-welded and heat treated compact tension specimens were prepared with the crack propagation plane perpendicular to the weld.Constant stress intensity factor range tests were performed at a load ratio R = 0.1 to reveal intra-specimen fatigue crack growth rate variations and differences between the fatigue crack growth behavior of as-welded and heat treated specimens.Comparing the fatigue crack growth rate of as-welded and heat treated specimens revealed that the crack propagates at a faster rate in the as-welded specimens where indications point to the existence of tensile residual stresses acting on the crack tip by inhibiting crack closure.As for the heat treated specimens,when the crack is in the base metal,the fatigue crack growth rate decreases accompanied by an increase in crack closure levels.Tensile residual stresses that may have remained after the post-weld heat treatment and their subsequent relaxation with crack growth could explain this behavior.
Welding Stainless Steel Fatigue Crack Growth Residual Stresses Crack Closure
Alexandre Trudel Myriam Brochu Martin Lévesque
Department of Mechanical Engineering,école Polytechnique de Montréal,Montréal,Canada
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）