作　　者： ; ; ;

机构地区： 暨南大学理工学院材料科学与工程系

出　　处： 《热加工工艺》 2014年第10期207-210,共4页

摘　　要： 采用金相显微镜、X射线衍射仪、硬度计、冲击试验机和扫描电镜，研究了铸态和经1050℃正火、920℃水淬和250℃回火热处理的含镍中碳低合金耐磨铸钢显微组织和硬韧性。结果表明，中碳低合金铸钢的铸态组织为片状珠光体，热处理后主要组织为混合马氏体。镍含量由0．08％增加到1．29％，铸态硬度逐渐上升，镍含量大于1．29％时，硬度稍降；冲击韧度随镍含量的增加而逐渐升高。热处理后的低合金钢硬度随镍含量的增加亦表现出先上升后下降的趋势，镍含量为0．08％～1．29％时，冲击韧度略有提高，当镍含量大于1．29％时，韧性迅速提高。镍含量为1．29％时．热处理低合金钢V型缺口韧度为11．9J，硬度为50．47HRC。硬韧性匹配较好。 The microstructure, hardness and toughness of the medium-carbon low-alloyed wear resistance steel in origional cast state and that normalized at 1050 ℃, water-quenched at 920 ℃ and then tempered at 250 ℃ were investigated by OM, XRD, durometer, impact testing machine and SEM. The results indicate that the microstructure of the medium-carbon low-alloyed cast steel in original state is lamellar pearlite, and the medium-carbon low-alloyed cast steel after heat treatment is mainly mixed martensite. The hardness of the＂former increases with the increase of nickel content in the range of 0.08wt% to 1.29wt%, but the hardness decreases when the nickel content above 1.29wt%. The impact absorbing energy increases with the increase of nickel content. The hardness of the latter firstly increases then decreases with the increase of nickel content. The impact absorbing energy improves slightly with the increase of nickel content from 0.08wt% to 1.29wt% and then decreases with the increase of nickel content. The medium-carbon low-alloyed cast steel after heat treatment with 1.29%Ni shows a better impact absorbing energy and hardness with V-notch impact absorbing energy 11.55 J and the hardness 50.47 HRC.

关 键 词： 镍 低合金钢 显微组织 硬度 韧度

领　　域： [金属学及工艺] [金属学及工艺]