Creep Behavior and Life Assessment of a Novel Heat-Resistant Austenite Steel and Its Weldment  

作　　者：Yu Zhang Hong-Yang Jing Lian-Yong Xu Yong-Dian Han Lei Zhao Xi-Shan Xie Qiu-Hua Zhu 

机构地区：[1]School of Materials Science and Engineering, Tianjin University [2]Tianjin Key Laboratory of Advanced Joining Technology [3]School of Materials Science and Engineering, University of Science and Technology,Beijing [4]Jiangsu Wujin Stainless Steel Pipe Group Co., Ltd

出　　处：《Acta Metallurgica Sinica(English Letters)》2019年第5期638-650,共13页金属学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Grant No. 51475326);the Demonstration Project of National Marine Economic Innovation (No. BHSF2017-22)

摘　　要：In the present study, creep activation energy for rupture was obtained as 221-348 kJ/mol for 22Cr15Ni3.5 CuNbN due to the precipitation-hardening mechanism. The extrapolation strength of creep rupture time of 10~5 h at 923 K for22 Cr15 Ni3.5 CuNbN is more valid(83.71 MPa) predicted by the Manson-Haferd method, which is superior to other commercial heat-resistant steels. The tensile creep tests ranging from 180 to 240 MPa at 923 K were conducted to investigate creep deformation behavior of welded joint between a novel heat-resistant austenite steel 22Cr15Ni3.5 CuNbN and ERNiCrCoMo-1 weld metal. Apparent stress exponent value of 6.54 was obtained, which indicated that the ratecontrolled creep occurred in weldment during creep. A damage tolerance factor of 6.4 in the weldment illustrates that the microstructural degradation is the dominant creep damaging mechanism in the alloy. Meanwhile, the welded joints perform two types of deformation behavior with the variation in applied stress, which resulted from the different parts that govern the creep processing. Also, the morphology evolution of the fracture surfaces confirms the effects of stress level and stress state.In the present study, creep activation energy for rupture was obtained as 221-348 kJ/mol for 22Cr15Ni3.5 CuNbN due to the precipitation-hardening mechanism. The extrapolation strength of creep rupture time of 10~5 h at 923 K for22 Cr15 Ni3.5 CuNbN is more valid(83.71 MPa) predicted by the Manson-Haferd method, which is superior to other commercial heat-resistant steels. The tensile creep tests ranging from 180 to 240 MPa at 923 K were conducted to investigate creep deformation behavior of welded joint between a novel heat-resistant austenite steel 22Cr15Ni3.5 CuNbN and ERNiCrCoMo-1 weld metal. Apparent stress exponent value of 6.54 was obtained, which indicated that the ratecontrolled creep occurred in weldment during creep. A damage tolerance factor of 6.4 in the weldment illustrates that the microstructural degradation is the dominant creep damaging mechanism in the alloy. Meanwhile, the welded joints perform two types of deformation behavior with the variation in applied stress, which resulted from the different parts that govern the creep processing. Also, the morphology evolution of the fracture surfaces confirms the effects of stress level and stress state.

关 键 词：HEAT-RESISTANT STEEL WELDMENT Creep deformation Life assessment TTP(time–temperature parametric) method 

分 类 号：TG[金属学及工艺]