Evolution of the mechanical properties of a cobalt-based alloy under thermal shocks

Wen, Junxia; Che, Hongyan; Cao, Rui; Dong, Hao; Ye, Youxiong; Zhang, Haiyan; Brechtl, Jamieson; Gao, Yanfei; Liaw, Peter K.

doi:10.1016/j.matdes.2019.108425

Title: Evolution of the mechanical properties of a cobalt-based alloy under thermal shocks

Journal Article · 12 December 2019 · Materials & Design

DOI: https://doi.org/10.1016/j.matdes.2019.108425 · OSTI ID:1606721

Wen, Junxia ^[1]; Che, Hongyan ^[2];

^[3]; Dong, Hao ^[2]; Ye, Youxiong ^[4]; Zhang, Haiyan ^[3];

^[4]; Gao, Yanfei ^[4];

^[4]

Lanzhou Univ. of Technology (China); Univ. of Tennessee, Knoxville, TN (United States); Liuzhou Vocational &Technical College (China)
China Iron & Steel Research Inst. Group, Beijing (China)
Lanzhou Univ. of Technology (China)
Univ. of Tennessee, Knoxville, TN (United States)

A cobalt-base alloy manufactured by hot isostatic pressing sintering (HIP) was investigated in the present work. A series of quenching thermal-shock experiments were carried out to study the effects of thermal-cycle shocks on this new cobalt-based alloy. Scanning Electron Microscope (SEM) and Energy Dispersion Spectrum (EDS) were employed to observe the evolution of microstructures under thermal-shock cycles. Results show that some floccus Co₃W₃C precipitated around the WC particles after several thermal-shock cycles. These precipitates and the carbide particles correspond to the locations with the high-stress concentration. The mechanical properties evolution under thermal-shock cycles was analyzed by Nanoindentation tests. The nanohardness presents no noticeable change with thermal-shock cycles. However, the reduced modulus demonstrates a decreasing trend with the thermal-shock cycles. The variation of the mechanical properties has an unestimated relationship with the residual stress and densities of dislocations caused by thermal shocks. Furthermore, the present work pointed out that the precipitates around the carbides are the places where the thermal fatigue crack initiated. How to deal with the precipitates will be the optimized way for this material.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; National Science Foundation; National Natural Science Foundation of China

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1606721

Journal Information:: Materials & Design, Journal Name: Materials & Design Journal Issue: C Vol. 188; ISSN 0264-1275

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
cobalt-based alloy
thermal shocks
nanoindentation test

Title: Evolution of the mechanical properties of a cobalt-based alloy under thermal shocks

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