期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：237
期号：3
页码：032096
DOI：10.1088/1755-1315/237/3/032096
出版社：IOP Publishing
摘要：In this paper, the MIG wire-filling method was used to fabricate 304 stainless steel in a layer-by-layer filling manner on a 20 mm thick low carbon steel surface. The microstructures of the upper, middle and lower parts of the cladding layer under different heat input conditions were studied. Finally, the microhardness test was carried out on different heights of the cladding layer produced by additive manufacturing under different processes. The results showed that with the gradual reduction of heat input, the grains of the same characteristic area were gradually refined under different processes. The cladding layer structure was mainly composed of columnar crystals, dendrites and equiaxed crystals. The microhardness increased as the heat input decreased. In this paper, the highest hardness value was 257.8 HV. The process parameters were voltage 27 V, current 190 A, deposition speed 8.69 mm/s, wire feeding speed 7 m/min, wire feeding angle 90° and shielding gas flow rate 15 L/min, respectively.
