The martensite-austenite constituent formation in X65 low-carbon steel under thermomechanical treatment and welding
The features of the martensite-austenite (M-A) constituent formation in the structures of X65 steel after helical rolling and laser welding were studied using transmission electron microscopy. Four main types of M-A constituent have been identified in the structures. After thermomechanical treatment under conditions of low cooling rates, the island type M-A constituent with a complex internal multiphase structure (types I and III) or a structure consisting entirely of twinned martensite (type II) is formed in X65 steel. The type of M-A constituent will change after laser welding. Instead of island multiphase areas of the M-A constituent, dispersed elongated sections are formed in the heat-affected zones (HAZ), consisting of residual austenite (type IV) or twinned martensite. The appearance of satellite spots in microdiffraction patterns taken from the M-A constituent areas in the HAZ of the welded joint was detected. It has been suggested that their formation is associated with local supersaturation of carbon in the M-A constituent and its inhomogeneous distribution due to the restriction of diffusion processes during accelerated cooling after laser welding.
Keywords
low carbon steel,
thermomechanical treatment,
laser welding,
microstructure,
martensite-austenite constituent,
residual austenite,
satellite spotsAuthors
| Gordienko A.I. | Institute of Strength Physics and Materials Science of SB RAS | mirantil@sibmail.com |
| Volochaev M.N. | Institute of Strength Physics and Materials Science of SB RAS | volochaev@iph.krasn.ru |
| Malikov A.G. | Institute of Strength Physics and Materials Science of SB RAS | smalik@ngs.ru |
| Panyukhina A.D. | Institute of Strength Physics and Materials Science of SB RAS | ovchinnikova-albina@mail.ru |
Всего: 4
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