TY - JOUR
T1 - Ferrite to austenite reverse transformation process in B containing 9%Cr heat resistant steel HAZ
AU - Shirane, T.
AU - Tsukamoto, S.
AU - Tsuzaki, K.
AU - Adachi, Y.
AU - Hanamura, T.
AU - Shimizu, M.
AU - Abe, F.
PY - 2009/11/1
Y1 - 2009/11/1
N2 - Creep properties, HAZ microstructure 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.
AB - Creep properties, HAZ microstructure 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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U2 - 10.1179/136217109X12505932584853
DO - 10.1179/136217109X12505932584853
M3 - Article
AN - SCOPUS:77949476218
VL - 14
SP - 698
EP - 707
JO - Science and Technology of Welding and Joining
JF - Science and Technology of Welding and Joining
SN - 1362-1718
IS - 8
ER -