Microstructure and Hot Deformation Behaviour of High-Cr Cast Iron/Low Carbon Steel Composite
A hot diffusion-compression bonding process was developed to fabricate a novel laminated composite consisting of high-Cr cast iron as the core and low carbon steel as the cladding on a Gleeble 3500 thermo mechanical simulator at a temperature of 1150℃ and a strain rate of 0.01 s-1.Interfacial bond quality was examined by microstructural characterisation,and hot deformation behaviour of the composite was studied by finite element modelling.Experimental results show that the metallurgical bond between the cast iron and carbon steel was achieved under the proposed bonding conditions.The interface has a good bonding quality because no defects such as micro crack and lack of bonding were detected.The intergrowth between the cast iron and carbon steel was observed,and a carbide-free zone was detected near the interface on the cast iron side.These phenomena indicate that the cast iron and carbon steel were bonded together by diffusion of elements.After well cladding by the low carbon steel,the brittle high-Cr cast iron can be severely deformed at high temperature with crack-free.This significant improvement should be attributed to a decrease of crack sensitivity due to stress being relieved by the soft cladding and an enhanced flow ability of the cast iron by a simultaneous deformation with ductile steel.
hot deformation behaviour high-Cr cast iron brittleness laminated metal composite
Gao Xingjian Jiang Zhengyi Wei Dongbin Jiao Sihai
School of Mechanical,Materials and Mechatronic Engineering,University of Wollongong,Wollongong,Austr School of Mechanical,Materials and Mechatronic Engineering,University of Wollongong,Wollongong,Austr Research Institute,Baoshan Iron and Steel Co.,Ltd.,Shanghai,China
国内会议
上海
英文
1-6
2015-10-21（万方平台首次上网日期，不代表论文的发表时间）