首页|Influence of heat input on microhardness and microstructure across the welding interface between stainless steel and low alloy steel
Influence of heat input on microhardness and microstructure across the welding interface between stainless steel and low alloy steel
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The welding interface is crucial to the service safety of dissimilar metal weld (DMW)joints between stainless steel (SS)and low alloy (LA)steel.Different status of welding interfaces was prepared by cladding SS consumables to LA steel substrates with different heat inputs via tungsten inert gas arc welding (TIG),followed by a series of microstructural characterizations and hardness tests.Results showed that a hardening and transition layer (TL)would be generated along the welding interface,and the width and hardening degree of the TL would increase with the heat input.Meanwhile,heavy load hardness tests showed that highly severe inhomogeneous plastic deformation and the microcrack would be generated in the interfacial region and the welding interface respectively in the highest heat input sample (1.03 kJ/mm).These results indicate that the increase in heat input would deteriorate the bonding performance of DMW joints.Further microstructural observations showed that the higher hardening degree of the highest heat input sample was mainly attributed to the stronger grain boundary,solution, and dislocation strengthening effects.
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