奥氏体不锈钢熔敷金属结晶裂纹断口形貌及抗热裂性能

Fracture morphology of solidification crack and crack resisting property of austenitic stainless steel deposited metal

The deposited metals of austenitic stainless steel type covered electrode with differentalloy system are tested by using Trans-varestraint test. Their fracture morphologies of cracks are observered with EPSA. The results show that when the crack-resisting capacity of deposited met-al is poor the crack fracture morphologies appear a development from prism to rectangle.The content of ferrite in weld metal is one of important factors affecting the solidificationcarck sensibility of austentic stainless steels deposited metal. While the temperature and strain rateare constant the crack-resisting property can be obivously improved through changing the ratioof .The deposited metal of the type covered electrode researched inthis paper possesses better crackresisting property when its is 1.7 and its ferritecontent is more than 1 5 pereent.