期刊
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
卷 14, 期 8, 页码 698-707出版社
MANEY PUBLISHING
DOI: 10.1179/136217109X12505932584853
关键词
Reverse transformation; B steel; Martensitic reverse transformation; Retained austenite; Ferritic heat resistant steel; Austenite memory effect; Creep properties; HAZ microstructure
资金
- New Energy and Industrial Technology Development Organization (NEDO)
Creep properties of the high Cr heat resistant steel welded joint can be improved by adding B due to prevention of the grain refinement in heat affected zone (HAZ). In the present study, phase transformation behaviour of the B steel HAZ has been investigated to understand suppression mechanism of the grain refinement. During reverse transformation, fine austenite was formed through diffusional transformation at the prior austenite grain boundary in the first stage, and then coarse austenite was formed at the same location of the original austenite. The volume fraction of the fine austenite increased with increasing perk temperature of the weld thermal cycle. This phenomenon can be explained if the coarse austenite contains high density of dislocations. Clear surface relief was observed during the reverse transformation by a confocal laser microscope. These results indicate that martensitic or displacive reverse transformation takes place during welding and it prevents the grain refinement in HAZ.
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