Microstructure,Mechanical Properties and Processing Study of Arc Overlying Welding Rapid Forming of 316L Stainless Steel

By comparing the different influences of welding voltage and welding speed of MIG method on the formation of single cladding pass, a proper processing parameter was obtained, and with which 316L stainless steel blocks were prepared. The microstructure and mechanical properties of the overlying welding rapid forming samples were studied. It is shown that, the microstructure of the rapid formed 316L materials is mainly consisted of coarse columnar grains in which dendrites grown epitaxially from the layers already formed. The rapid formed blocks are compact and free from porosities and inclusions. Tensile testing results at room temperature show that the tensile strength of the rapid forming samples reaches up to 605 MPa and elongation is 32.1%. This result is better than that of the hot rolling and casting samples. Finally, it is concluded that, for the arc overlying rapid forming of 316L stainless steel, heat accumulation have little influence of on microstructure and mechanical property, and continuous processing without interval cooling can be used in the actual production.