Abstract：The E309 type austenitic electrodes was used in welding of 13CrMo44 heat resisting steel to form a dissimilar metal joint. The notched three-point bend specimens (S/W=4) were prepared for the fatigue crack propagation (FCP) test. The relationship between the fatigue crack propagation and the microstructures in the joint was studied. The results show that the path that the fatigue crack propagation takes is in the overheated zone of HAZ, which may be attributed to the low toughness values in the zone. The fatigue crack propagates along the fusion zone at the region 5 25μm to the fusion line. The martensite layer has ability to resist the fatigue crack propagation,which indicates that the trace of FCP is mainly controlled by toughness of the structures. The expression for fatigue crack propagation rate in the fusion zone of the Cr25Ni13/13CrMo44 dissimilar metal joint by Paris equation is as follows:da/dN=7.07×10-13(△K)3.863.
王智慧, 贺定勇. 疲劳裂纹在奥氏体/铁素体异种钢焊接接头中的扩展行为[J]. 材料工程, 2001, 0(1): 36-39.
WANG Zhi-hui, HE Ding-yong. The Behavior of the Fatigue Crack Propagation in Austenitic/Ferritic Dissimilar Metal Joints. Journal of Materials Engineering, 2001, 0(1): 36-39.