添加合金元素对耐热铸铁显微组织和抗拉强度的影响  

Effect of additive alloying elements on microstructure and tensile strength of heat-resistant cast iron

作　　者：朱婷婷[1] 刘可[1,2] 薛正良[1] 邹峰[1] 熊锐[1] 

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081 [2]中冶集团武汉冶金建筑研究院,湖北武汉430081

出　　处：《武汉科技大学学报》2015年第2期81-84,共4页Journal of Wuhan University of Science and Technology

基　　金：武汉科技大学钢铁冶金及资源利用教育部重点实验室开放基金资助项目(2014QN21)

摘　　要：利用光学显微镜观察五组不同化学成分铸锭的显微组织,并对铸锭试样在不同温度下抗拉强度进行测定,研究碳元素和合金元素对铸铁抗拉强度的影响。结果表明,在碳含量适宜的情况下,添加适量合金元素Ni、Mo能提高铸铁的高温强度;w(C)为3.72%、w(Si)为2.45%、w(Mn)为0.661%、w(Cr)为0.90%、w(Ni)为0.66%、w(Mo)为0.12%、w(Cu)为0.159%的合金蠕墨铸铁在600℃高温下的抗拉强度仍能达到358MPa。The microstructures of five kinds of ingots with different chemical compositions were observed by optical microscope and the tensile strength of each sample was measured at different temperatures.The effects of carbon and alloying elements on the tensile strength of the samples were investigated.The results show that the high temperature tensile strength of the samples can be improved by adding appropriate amounts of nickel and molybdenum when the carbon content is reasonable.Additionally,the tensile strength of vermicular graphite cast iron,which has the composition of 3.72%C,2.45% Si,0.661%Mn,0.90%Cr,0.66%Ni,0.12%Mo and 0.159%Cu,can still maintain 358 MPa at 600 ℃.

关 键 词：耐热铸铁 合金元素 化学成分 显微组织 抗拉强度 

分 类 号：TG143[一般工业技术—材料科学与工程]