Microstructure and Properties of Welded Joint of E36 Steel and 304 Stainless Steel by Electron Beam Welding
Author(s): Liu Dongyu, Li Dong, Li Kaibin, Chen Qianqian
Pages: 29-33,68
Year: 2014 Issue: 6
Journal: Aerospace Manufacturing Technology
Keyword: electron beam welding; dissimilar steel; microstructure; properties;
Abstract: E36 high-strength steel and 304 stainless steel were welded by electron beam welding. Microstructure was investigated by means of optical microscope (OM), scanning electron microscopy (SEM), energy disperse spectroscopy (EDS) and X-ray diffraction (XRD), and the micro-hardness of joint was also tested. The results show that electron beam welding is well used to dissimilar steel’s welding. There was no significant change on HAZ of 304 stain steel while a fewδ-ferrites are separated out on the fusion zone. After the modification welding, microstructure is transformed from dendritic crystals to cellular dendrites and cellular crystals from fusion zone to the middle of weld zone of E36, but for 304 stain steel, microstructure is transformed from planar crystals to cellular dendrites and cellular crystals. The weld zone mainly consists of martensitics and a few carbides, while the lath martensites, ferrites and pearlites are formed on HAZ of E36. There are composition gradient on both sides of the fusion zone. The highest hardness value of weld zone is about 430HV, the hardness value of 304 fusion zone is lager than before while nearby weld zone of E36 becomes lower with the increase of the depth.
Pages: 29-33,68
Year: 2014 Issue: 6
Journal: Aerospace Manufacturing Technology
Keyword: electron beam welding; dissimilar steel; microstructure; properties;
Abstract: E36 high-strength steel and 304 stainless steel were welded by electron beam welding. Microstructure was investigated by means of optical microscope (OM), scanning electron microscopy (SEM), energy disperse spectroscopy (EDS) and X-ray diffraction (XRD), and the micro-hardness of joint was also tested. The results show that electron beam welding is well used to dissimilar steel’s welding. There was no significant change on HAZ of 304 stain steel while a fewδ-ferrites are separated out on the fusion zone. After the modification welding, microstructure is transformed from dendritic crystals to cellular dendrites and cellular crystals from fusion zone to the middle of weld zone of E36, but for 304 stain steel, microstructure is transformed from planar crystals to cellular dendrites and cellular crystals. The weld zone mainly consists of martensitics and a few carbides, while the lath martensites, ferrites and pearlites are formed on HAZ of E36. There are composition gradient on both sides of the fusion zone. The highest hardness value of weld zone is about 430HV, the hardness value of 304 fusion zone is lager than before while nearby weld zone of E36 becomes lower with the increase of the depth.
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