期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 259, 期 -, 页码 195-205出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2018.04.041
关键词
Filler wire; Laser welding; Al-Si coating; Hot stamping; delta-ferrite
资金
- Baoshan Iron Steel Company
- Natural Science Foundation of China (NSFC) [51705318]
- Ministry of Industry and Information Technology of China
Carbon-steel filler wire was used to solve the coating problem in laser welded blanks of Al-Si-coated 22MnB5 without a decoating procedure. The effect of the filler wire on the fusion-zone microstructure and mechanical properties was investigated. The Al content was diluted by the filler wire. The delta-ferrite phase was also reduced after the reduction in Al and homogenization. The joint strength was similar to 1210 MPa, and the elongation was 1.1% without filler wire. When filler wire was used, the joint strength increased to 1550 MPa, and the elongation was greater than 3%. The fracture surface of the joint with the filler wire was ductile. The effects of welding speed and feeding speed were also studied. A reduction in the Al content at the higher feeding speed or the use of a slower welding speed was found to be most effective because either approach enabled more filler material to be added to lower the ratio of the Al-Si coating in the fusion zone. In the absence of the filler wire, the delta-ferrite phases were large and long, connecting to a bulk zone. When the filler wire was used, the delta-ferrite phases were broken up and became narrow and small with a uniform distribution in the martensite matrix.
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