Macrosegregation induced interface structure and its effect on creep failure in dissimilar metal welds between Ni-based alloy and 10% Cr martensitic steel

被引：14

作者：

Zhang, Yu ^{[1
,2
]}

Cai, Zhipeng ^{[1
,2
,3
,4
]}

Han, Chaoyu ^{[1
,2
]}

Huo, Xin ^{[5
]}

Fan, Manjie ^{[5
]}

Li, Kejian ^{[1
,2
]}

Pan, Jiluan ^{[1
,2
]}

机构：

[1] Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China

[2] Minist Educ, Key Lab Adv Mat Proc Technol, Beijing 100084, Peoples R China

[3] Tsinghua Univ, State Key Lab Tribol, Beijing 100084, Peoples R China

[4] Tsinghua Univ, Collaborat Innovat Ctr Adv Nucl Energy Technol, Beijing 100084, Peoples R China

[5] Shanghai Turbine Plant Shanghai Elect Power Gener, Shanghai 200240, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2021年 / 824卷

基金：

中国国家自然科学基金;

关键词：

Dissimilar metal weld; Macrosegregation; Interface structure; Phase transformation; Creep failure; MICROSTRUCTURAL EVOLUTION; TRANSITION JOINTS; RESIDUAL-STRESS; SHEAR-STRESS; POWER-PLANTS; TRANSFORMATION; STRENGTH; USC; MECHANISMS; PREDICTION;

D O I：

10.1016/j.msea.2021.141847

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This study reported the evolutionary behavior of macrosegregation induced interface structure during post weld heat treatment (PWHT) and its effect on creep failure in dissimilar metal welds (DMWs) between Ni-based alloy and 10%Cr martensitic steel with Ni-based filler metal. During welding, macrosegregation led to formation of partially mixed beach-like lath martensite interface structure on the steel side. The beach-like structure transformed to rod-like Ni-rich and C-rich martensite accompanied by Ni-depleted and C-depleted martensite/ferrite after PWHT due to partial austenization and diffusion of austenite-stabilizing elements like Ni and C. Interfacial creep failure occurred along the interface between steel and the beach-like interface structure, which was related to creep voids nucleation at the BCC/FCC interface between steel and the beach-like structure during creep at 600 degrees C. Hence, the relationship between macrosegregation, interface structure and creep failure in the DMWs was clarified.

引用

页数：8

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