包覆对称组坯热轧制备高铬铸铁/低碳钢耐磨复合板
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摘要
通过对碳钢板和高铬铸铁板进行六层对称包覆组坯,在1 200℃下分别采用30%和60%压下率多道次热轧制备了耐磨复合板。使用扫描电镜对试样的微观组织和界面结合情况进行了观察。试验结果表明:热轧后板形表现平直无翘曲现象;热轧过程中较软碳钢层的协调变形和应力释放作用使得高铬铸铁热变形裂纹敏感度降低,脆性高铬铸铁层实现了一定程度的热变形;两种材质界面结合质量良好,无可辨别的沿界面的夹层和空隙等缺陷;通过EDS能谱检测发现在高铬铸铁侧有无碳化物的过渡区,界面两侧的硬度值连续变化,证明两种材料实现了冶金结合。
The carbon steel and high-chromium cast iron plates were symmetrically cladded with asix-layer billet,and then multi-pass hot-rolled to prepare a wear-resistant composite plate at a temperature of1 200 ℃ with 30%and 60%reduction rates. The microstructure of the samples was observed by SEM. Theexperimental results show that the plate deformations after hot rolling are straight and warping-free. Due to thecoordinated deformation and stress release of the soft carbon steel during hot rolling,the sensitivity of hotdeformation cracking of high chromium cast iron is reduced,and the brittle high chromium cast iron layerachieves a certain degree of thermal deformation. The two material interfaces with good quality,there is nodiscernable interfacial interlayers and gaps and other defects. Energy dispersive spectrometer(EDS)tests findthat a transition zone free of carbides on the high-chromium cast iron sides and the hardness values on bothsides of the interface continuously changes indicates metallurgical bonding between the two materials.
The carbon steel and high-chromium cast iron plates were symmetrically cladded with asix-layer billet,and then multi-pass hot-rolled to prepare a wear-resistant composite plate at a temperature of1 200 ℃ with 30%and 60%reduction rates. The microstructure of the samples was observed by SEM. Theexperimental results show that the plate deformations after hot rolling are straight and warping-free. Due to thecoordinated deformation and stress release of the soft carbon steel during hot rolling,the sensitivity of hotdeformation cracking of high chromium cast iron is reduced,and the brittle high chromium cast iron layerachieves a certain degree of thermal deformation. The two material interfaces with good quality,there is nodiscernable interfacial interlayers and gaps and other defects. Energy dispersive spectrometer(EDS)tests findthat a transition zone free of carbides on the high-chromium cast iron sides and the hardness values on bothsides of the interface continuously changes indicates metallurgical bonding between the two materials.
引文
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[3]李茂林.我国金属耐磨材料的发展和应用[J].铸造,2002,51(9):525-529.LI Maolin.Development and Application of Wear Resistant Metal Materials in China[J].Foundry,2002,51(9):525-529.
[4]郝石坚.高铬耐磨铸铁[M].北京:煤炭工业出版社,1993:1-20.HAO Shijian.High Chromium Wear-resistant Cast Iron[M].Beijing:China Coal Industry Publishing House,1993:1-20.
[5]SAPATE S G,RAO A V R.Effect of Carbide Volume Fraction on Erosive Wear Behaviour of Hardfacing Cast Irons[J].Wear,2004,256(7/8):774-786.
[6]刘晓涛,张廷安,崔建忠.层状金属复合材料生产工艺及其新进展[J].材料导报,2002,16(7):41-43.LIU Xiaotao,ZHANG Ting.an,CUI Jianzhong.Technology of Clad Metal Produetion and Its Latest Progress[J].Materials Review,2002,16(7):41-43.
[7]周志宏.高铬铸铁堆焊复合耐磨板工艺研究[J].化学工程与装备,2010(7):100-102.ZHOU Zhihong.Research on the Process of Surfacing and Wear-resisting Composite Wear Plates of(下转第1374页)High-chromium Cast Iron[J].Chemical Engineering&Equipment,2010(7):100-102.
[8]OH H,LEE S,JUNG J,et al.Correlation of Microstructure with the Wear Resistance and Fracture Toughness of Duocast Materials Composed of High-chromium White Cast Iron and Low-chromium Steel[J].Metallurgical&Materials Transactions A,2001,32(3):515-524.
[9]覃劲松,贺柏龄.高铬铸铁-碳钢复合板水平浇注铸造工艺[J].热加工工艺,2004(5):33-34.QIN Jinsong,HE Bailin.Plane Casting Technology for High Chromium Cast/Carbon Steel Composite Plate[J].Hot Working Technology,2004(5):33-34.
[10]XIAO X F,YE Shengping,YIN Weixin,et al.HCW-CI/Carbon Steel Bimetal Liner by Liquid-Liquid Compound Lost Foam Casting[J].Journal of Iron and Steel Research,2012,19(10):13-19.
[11]EROGLU M,KURT B.Diffusion Bonding Between High Chromium White Iron and Low Carbon Steel[J].Metal Science Journal,2013,23(2):171-176.
[12]LIU F,JIANG Y,XIAO H,et al.Study on Fragmentation and Dissolution Behavior of Carbide in a Hot-rolled Hypereutectic High Chromium Cast Iron[J].Journal of Alloys&Compounds,2015,618:380-385.
[13]JIANG Z Y,GAO X J,LI Shengli,et al.Interface Analysis and Hot Deformation Behaviour of a Novel Laminated Composite with High-Cr Cast Iron and Low Carbon Steel Prepared by Hot Compression Bonding[J].Journal of Iron and Steel Research,2015,22(5):438-445.
[14]GAO X,JIANG Z,WEI D,et al.Effects of Temperature and Strain Rate on Microstructure and Mechanical Properties of High Chromium Cast Iron/Low Carbon Steel Bimetal Prepared by Hot Diffusion-compression Bonding[J].Materials&Design,2014,63(63):650-657.