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热处理对变质处理铸铁组织和力学性能的影响
引用本文:石小红,詹传明.热处理对变质处理铸铁组织和力学性能的影响[J].湖南有色金属,2010,26(6):34-38.
作者姓名:石小红  詹传明
作者单位:宜昌测试技术研究所,湖北宜昌443003
摘    要:在熔炼过程中对成分为1号:3.2C-1.0Si-0.6Mn-1.5Cr-2.0Ni;2号:3.2C-1.0Si-0.6Mn-1.5Cr-4.0Ni-0.7Mo的铸铁进行复合变质处理,制备变质铸铁试样。对试样进行球化退火、淬火及回火处理。观察试样各种状态的微观组织,测定其宏观硬度和抗拉力学性能。结果表明:变质处理能显著破坏碳化物网状结构,得到彼此孤立的块状碳化物。在950℃淬火后变质试样,分别在300℃、430℃、630℃回火,结果显示,随着回火温度的升高,马氏体完全分解的数量增多,硬度逐步下降。球化处理后,组织中出现了大量球粒状珠光体和渗碳体,硬度下降;两种铸铁抗拉强度分别为880 MPa和1 050 MPa,伸长率为2.8%、2.4%。

关 键 词:白口铸铁  变质处理  淬火回火  球化退火

The Effects of Heat Treatment on Microstructure and Mechanical Properties of Modified Cast Iron
SHI Xiao-hong,ZHAN Chuan-ming.The Effects of Heat Treatment on Microstructure and Mechanical Properties of Modified Cast Iron[J].Hunan Nonferrous Metals,2010,26(6):34-38.
Authors:SHI Xiao-hong  ZHAN Chuan-ming
Affiliation:(Testing Technology Institute of Yichang,Yichang 443003,China)
Abstract:The modified cast iron specimens were prepared by bringing the multi-modification into the melt during melt-casting process.Alloy 1:3.2C-1.0Si-0.6Mn-1.5Cr-2.0Ni;Alloy 2:3.2C-1.0Si-0.6Mn-1.5Cr-4.0Ni-0.7Mo.The specimens are annealed.The optical images shows that the lattice structure of carbides were broken and the carbides became isolated after modification.The specimens were quenched at 950 ℃,then tempered alternatively at 300 ℃,430 ℃,630 ℃,the optical images shows that the martensite decreased and the hardness decreased with the increase of temperature.A spheroidizing technology was applied to the specimens.There is some spherical pearlite and cementites appeared,and the hardness is lower than the tempered specimens.The tensile strength of the modified cast iron 1 and 2 are 880 MPa and 1 050 MPa respectively,while the elongation is poor,2.8% and 2.4%.The probable reason is that the temperature of spheroidizing anneal is low that there are still unspherical cementites.
Keywords:white cast iron  modification  tempering  spheroidization anneal
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