45钢磨削硬化的试验研究

Experimental studies of grind-hardening for AISI1045 steel

在平面磨床上,采用干磨削方式对45钢进行了磨削硬化处理,研究了磨削硬化层的组织与性能.结果表明,在磨削温度场和应变场的综合作用下,完全硬化区马氏体相呈现“细-粗-细”的变化规律,且相对粗大马氏体相出现在次表层;而过渡区组织的形成主要在于磨削热循环温度场的作用.磨削深度或原始组织对显微硬度无显著影响,硬度值均在700～750HV之间;但磨削硬化层深度随着磨削深度的增加或原始组织均匀性的提高,从0.9mm增大到1.4mm.

The surface hardening of AISI1045 steel has been carried out on a surface grinder with dry grinding method. The microstructures and properties in grind-hardened layer were researched. The results showed that the martensite varies from fine to coarse and then backs to fine in the completely hardened zone, due to the coupled effect of temperature field and strain field. The coarse martensite formed in the subsurface. The grinding temperature field affects the microstructure of the transition zone. No significant changes of the micro-hardness were observed; the micro-hardness is 700-750HV in different grind conditions. But when the uniformity of original structure or depth of cut increases, the hardened layer depth increases from 0.9mm to1.4mm.