Journal
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
Volume 50, Issue 2, Pages 595-600Publisher
SPRINGER
DOI: 10.1007/s11663-019-01519-x
Keywords
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Funding
- National Natural Science Foundation of China [51622401, 51628402, BRICS 51861145312, NAF 51861130361]
- National Key Research and Development Program of China [2016YFB0300602]
- Research Fund for Central Universities [N172502004]
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University [SKLSP201805]
- Global Talents Recruitment Program by the Chinese Government
- Jiangyin Xingcheng Special Steel Works Co., Ltd.
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The present study elaborates on the effect of simulated postweld heat treatment (SPWHT) on microstructure and mechanical property variations of 1.25Cr-0.5Mo steel. With the increase in SPWHT holding time, lath ferrite tends to morph into blocky ferrite, and carbides aggregate along grain boundaries. Although tensile strength keeps decreasing, Charpy impact toughness undergoes a spike, followed by a sharp decrease. Such an interesting phenomenon is explained by the competition between high-angle grain boundary population and carbide segregation, and bodes well to the pressure vessel industry for optimized PWHT.
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