Effect of notch depth on creep rupture behaviour of 304HCu austenitic stainless steel

被引：15

作者：

Sahoo, Kanhu Charan ^{[1
]}

Goyal, Sunil ^{[2
]}

Paul, V. Thomas ^{[2
]}

Laha, Kinkar ^{[3
,4
]}

机构：

[1] Homi Bhabha Natl Inst, Kalpakkam Campus, Mumbai, Maharashtra, India

[2] Indira Gandhi Ctr Atom Res, Met & Mat Grp, Kalpakkam, Tamil Nadu, India

[3] Dept Atom Energy, Mumbai, Maharashtra, India

[4] AUSC Mission Project, Noida, India

来源：

MATERIALS AT HIGH TEMPERATURES | 2020年 / 37卷 / 05期

关键词：

304HCU SS; multiaxial Creep; notch depth; finite element analysis; SEM characterisation; EBSD-KAM mapping; STRESS; REDISTRIBUTION;

D O I：

10.1080/09603409.2020.1785084

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Multiaxial creep behaviour of 304HCu austenitic stainless steel was studied at 973 K, 200 MPa by varying depth of U-notches from 1.67 to 3 mm, keeping the root radius of 1.25 mm on cylindrical specimen. Rupture life increased with notch depth and showed a peak value for 2.5 mm depth followed by rapid decrease, indicating the tendency towards notch weakening instead of strengthening. Creep rupture ductility decreased progressively with notch depth, resulting predominantly ductile dimple for shallow depth of notch and creep cavitation induced brittle fracture for deeper notch. Finite element analysis of stress and strain distributions across the notch along with SEM fractography and Electron Backscatter Diffraction (EBSD) studies was carried out to assess the effect of notch depth on creep rupture life. Creep strain concentration through Kernel Average Misorientation (KAM) map also supported the above views of creep strain accumulation which influence creep rupture life of notched specimens.

引用

页码：295 / 304

页数：10

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