热处理对无钼镍低合金耐磨铸钢组织和性能的影响  

Effect of Heat Treatment on Microstructure and Performance of Mo and Ni-Free Low Alloy Wear-Resistant Cast Steel

作　　者：侯建强[1] 符寒光[1] 蒋志强[2] 雷永平[1] 尹恩生 田玉铁 

机构地区：[1]北京工业大学材料科学与工程学院,北京100022 [2]郑州航空工业管理学院,河南郑州450015 [3]新疆八钢佳域公司机械厂,新疆乌鲁木齐830022

出　　处：《铸造》2010年第5期441-444,共4页Foundry

基　　金：国家航空科学基金(2009ZF55008);乌鲁木齐市科技计划资助(Y09112004)

摘　　要：以低价的硅、锰、铬为主要合金元素,加入少量的硼、钛和稀土等元素细化和净化铸钢的组织,设计研究了一种不含钼、镍等贵重合金的低合金耐磨铸钢,同时研究了不同淬火温度对铸钢组织和性能的影响。结果表明,随着淬火温度的升高,硬度略有提高。淬火温度超过950℃后,淬火组织略显粗化,且出现残留奥氏体,硬度反而下降。在950℃淬火时,低合金铸钢组织由强韧性好的细小板条状马氏体和少量残余奥氏体组成且组织均匀性好,硬度大于HRC52,无缺口试样冲击韧性大于100J/cm2,综合性能良好。用于制造挖掘机斗齿,使用寿命比高锰钢斗齿提高2倍以上。The Mo and Ni-free low alloy wear-resistant cast steel was successfully developed and its main alloy elements were silicon, manganese and chromium. Moreover, there were some trace elements such as boron, titanium and rare earth in the cast steel which could refine and purify the structure of steel. The effect of heat treatment temperature on the structure and property of cast steel was also studied. The results show thatthe hardness of cast steel has a slight increase with the increase of quenching temperature. When the quenching temperature is above 950 ℃, the structure is slightly coarsened and the retained austenite appears and the hardness has a slight decrease. After quenching at 950℃, the structure of cast steel consists of the lath martensite and a little retained austenite. Its hardness was over HRC 52 and the impact toughness greater than 100 J/cm^2 with unnotched specimen. The service life of low alloy cast steel bucket teeth is two times longer than that of high manganese steel.

关 键 词：低合金铸钢 显微组织 力学性能 热处理 

分 类 号：TG161[金属学及工艺—热处理]