易切削钢中夹杂物的纳米压痕表征  

Nanoindentation characterization of non-metallic inclusions in free cutting steel

作　　者：王毓男[1,2] 包燕平[1,2] 王敏[3] 

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083 [2]北京科技大学冶金与生态工程学院,北京100083 [3]北京科技大学国家板带生产先进装备工程技术研究中心,北京100083

出　　处：《北京科技大学学报》2014年第7期903-909,共7页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(51274029);中国博士后科学基金资助项目(2012M510319)

摘　　要：利用纳米压痕技术对钢中BN、MnS、Al2O3、TiN等夹杂物进行纳米压痕表征,详细讨论了BN夹杂物对钢的切削性能的改善作用,并分析了纳米压痕表征及宏观硬度测量的误差.研究表明:铸态BN夹杂物硬度低于MnS夹杂物,锻造态BN夹杂物硬度高于MnS夹杂物,三者均远低于钢基体;铸态与锻造态BN夹杂物均能在钢中起到应力集中源、润滑及包裹硬质点的作用,改善钢的切削性能;纳米压痕表征及宏观硬度测量均存在一定的误差.Inclusions in free cutting steel such as BN, MnS, Al2 O3 and TiN were characterized by nanoindentation. The improvement of BN inclusions on the machinability of the steel was discussed. The error between nanoindentation and macrohardness measurement was analyzed. The hardness of BN inclusions in as-cast samples is lower than that of MnS inclusions, but BN inclusions after forging become harder than MnS, even though these three kinds of inclusions are far softer than the based metal. BN inclusions in as-cast samples and forged samples are stress concentration sources, lubricants and enclose hard particles, therefore improve the machinability of the steel. Nanoindentation characterization and macrohardness measurement have certain error.

关 键 词：易切削钢 非金属夹杂物 纳米压痕 硬度 切削性能 氮化硼 

分 类 号：TG142.33[一般工业技术—材料科学与工程]