含锡易切削中碳钢的切削加工性能  

Machinability of medium carbon tin-bearing free cutting steel

作　　者：张永军[1] 韩静涛[1] ZHANG Yong-jun,HAN Jing-tao(School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, Chin)

机构地区：[1]北京科技大学材料科学与工程学院

出　　处：《钢铁研究学报》2018年第1期66-70,共5页Journal of Iron and Steel Research

摘　　要：含锡易切削钢是一种环境友好的钢铁材料。对利用真空感应炉冶炼锡的质量分数为0.16%的试验用含锡易切削中碳钢,经过热锻成型直径100 mm的圆钢。之后,在C6140无极调速机床上对其进行切削加工性能试验研究,同时利用二次离子质谱仪对Sn、S、Mn合金元素在试验用含锡易切削钢中的分布进行表面线、面扫描的质谱分析。研究结果表明,试验钢的相对切削系数为1.75;切屑的形状主要呈C型,并伴有少量螺旋屑,说明该钢具有良好的切削加工性,能够满足高速切削加工的要求。锡在晶界和Mn S界面上偏聚的这种分布特点以及锡的低熔点特性而引起的晶界脆化,熔融金属脆性,以及切削刀具与切屑、工件界面之间的润滑剂——熔融锡的润滑作用,可以认为是该钢易切削的主要机理。Tin-bearing free cutting steel is environmentally friendly material. The test steel of 100 mm in diameter with Sn of 0. 16 mass% by smelting in industrial frequency induction furnace and hot forging was prepared. Machinability experiments of the test steel using a stepless speed regulation lathe（ C6140） was conducted. Besides,the distribution of tin,sulfur and manganese in the tested steel using secondary ion mass spectrometer was analyzed. The research results show that the coefficient of relative machinability of the test steel is 1. 75,the style of cutting chip mainly is C-shaped,in addition to this,there is a small amount of helical chip. Therefore,the test steel has excellent machinability,and it can meet the requirements of high speed machining. It is considered that grain boundary embrittlement caused by segregation of tin at ferrite grain boundaries,liquid metal embrittlement and lubrication action caused by low melting point of tin,are main reasons of the improvement of machinability.

关 键 词：含锡易切削钢 切削加工性能 晶界脆化 熔融金属脆性 润滑作用 

分 类 号：TG142.1[一般工业技术—材料科学与工程]