Fatigue Behavior of High Speed Steel Roll Materials for Hot Rolling by Laser Impacting  

作　　者：ZHOU Li SUN Da-le LIU Chang-sheng WU Qiong 

机构地区：[1]School of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China [2]Technology Center, Baoshan Iron and Steel Co Ltd, Shanghai 201900, China

出　　处：《Journal of Iron and Steel Research International》2006年第6期49-52,共4页

基　　金：ItemSponsored by National Natural Science Foundation of China (50274028) ;State Key Fundamental Research Project(G19990650)

摘　　要：The fatigue behavior of high speed steel （HSS） roll materials for hot rolling was researched under watercooling conditions by laser impacting. The microstructure of HSS sample and the morphologies of fatigue samples were observed by scanning electron microscope. The phase structure was detected by XRD. The morphology of situ oxide scale was observed by optical microscope, and the expansion coefficient was measured by TGA. The experiment results indicate that the cracks come into being at the carbide-matrix interface, but there are no cracks in the matrix after many times of laser impacting treatment, for the situ sample taken from the fractured roll surface, big carbides are more sensitive to the fatigue, and peel off prior to small ones. The relevant fatigue mechanisms are also discussed.The fatigue behavior of high speed steel （HSS） roll materials for hot rolling was researched under watercooling conditions by laser impacting. The microstructure of HSS sample and the morphologies of fatigue samples were observed by scanning electron microscope. The phase structure was detected by XRD. The morphology of situ oxide scale was observed by optical microscope, and the expansion coefficient was measured by TGA. The experiment results indicate that the cracks come into being at the carbide-matrix interface, but there are no cracks in the matrix after many times of laser impacting treatment, for the situ sample taken from the fractured roll surface, big carbides are more sensitive to the fatigue, and peel off prior to small ones. The relevant fatigue mechanisms are also discussed.

关 键 词：high speed steel fatigue laser impacting stress concentration carbide 

分 类 号：TG142.45[一般工业技术—材料科学与工程]