Effect of Carbon Content on the Creep Rupture Properties and Microstructure of 316H Weld Metals  

作　　者：Langlang Zhao Shitong Wei Dianbao Gao Shanping Lu 

机构地区：[1]Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China [3]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [4]Nuclear Power and Petro-Chemical Business Group,China First Heavy Industries,Dalian 116113,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2021年第7期986-996,共11页金属学报（英文版）

基　　金：financially supported by the Opening Foundation of CAS Key Laboratory of Nuclear Material and Safety Assessment under Grant No.2019NMSAKF04;the China Institute of Atomic Energy under Grant No.2016-DGB-I-KYSC-0024。

摘　　要：Two types of 316 butt welds with carbon contents of 0.016%and 0.062%have been produced using the gas tungsten arc welding process.Theδ-ferrite content decreased from 7.2 to 2.8%in volume as the carbon content increased.The creeprupture strength and creep ductility of the two types of weld metals have been measured at 550℃over the stress range of 290-316 MPa and at 600℃over 230-265 MPa.The microstructure change and precipitation behavior of the weld metals were observed and related to the creep rupture properties.The creep rupture strength of the C2(0.062%C)weld metal was higher than that of the Cl(0.016%C)weld metal at both 550℃and 600℃.At 550℃,as the decrease in the applied stress,the difference of the creep-rupture life between the two weld metals diminished due to the higher depletion rate of carbon by precipitation of M_(23)C_(6) in the C2 weld metal,while at 600℃,the difference enlarged due to the massive precipitation ofσphase and extensive crack formation and propagation alongσ/austenite boundaries in the C1 weld metal.For both the C1 and C2 weld metal,the decrease in ductility was adverse with the transformation percentage and related to products of theδ-ferrite transformation.

关 键 词：316 stainless steel weld metal Creep rupture properties Δ-FERRITE M23C6 σphase 

分 类 号：TG441.7[金属学及工艺—焊接]