SelfSuperplasticization of Spray Formed UltrahighCarbon Steel
LIN Yijian1,ZHANG Jingguo1,LI Xiaojun2,SHI Haisheng3,ZHOU Candong3
1. Shanghai Key Lab. of Functional Metallic Materials, Shanghai 200092, China; 2. School of Material Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, China;3. Advanced Technology Institute,Shanghai Baosteel Research Institute, Shanghai 201900, China
Abstract：1.25C2.8Si1.5Cr ultrahigh carbon steel (UHCS) with a carbidenetworkfree and fully fine pearlitic microstructure,prepared by spray forming technology, exhibits fairly good superplasticity with elongation up to 380% without any thermal and/or mechanical pretreatment.An elongation of 122% was reached when the strain rate was raised to 2×10-1s-1.It was found that the unique superplasticity is resulted from microstructure evolution during the deformation, from the pearlite to fineequiaxedgrained structure with the lamellar cementite turning into spheroidized particles. High strain rate could facilitate utrafine spheroidized structure. Based on the above result, a method combining sprayforming and hot rolling with highdeformation rate was developed to make UHCS superplastic more effectively. The method was proved to be effective for other highcarbon steels such as highspeed steels.
林一坚;章靖国;李小军;史海生;周灿栋. 喷射成形超高碳钢的自超塑化现象[J]. 钢铁, 2007, 42(7): 59-0.
LIN Yijian;ZHANG Jingguo;LI Xiaojun;SHI Haisheng;ZHOU Candong. SelfSuperplasticization of Spray Formed UltrahighCarbon Steel. Iron and Steel, 2007, 42(7): 59-0.
2007, Vol. 42 
