Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 51, Issue 7, Pages 3371-3376Publisher
SPRINGER
DOI: 10.1007/s11661-020-05806-0
Keywords
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Funding
- National Natural Science Foundation of China [51622401, 51861130361, 51861145312, 51850410522]
- Newton Advanced Fellowship by the Royal Society [RP12G0414]
- Fundamental Research Fund for Central Universities [N172502004, N182506002]
- Natural Science Foundation of Liaoning [2019KF0502]
- Xingliao Talents Program [XLYC1807024, XLYC1802024]
- Innovation Team of Northeastern University
- Global Talents Recruitment Program by the Chinese Government
- UK's Engineering and Physical Sciences Research Council, EPSRC Early Career Fellowship Scheme [EP/R043973/1]
- EPSRC [EP/R043973/1] Funding Source: UKRI
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The solid-state phase transformation in the coarse-grained heat-affected zone of P91 steel under simulated welding thermal cycle has been investigated in situ by confocal scanning laser microscope. It is found that gamma-austenite initiates from the triple point of delta-ferrite grain boundaries (GBs), then at ordinary delta-GBs, and eventually from grain interiors. Upon further cooling, martensite laths are observed to nucleate and growth instantaneously, with the growth rate being estimated ranging from 175 to 454 mu m/s.
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