冷却方式及试样尺寸对42CrMo钢磨削淬硬层影响  

Effect of Cooling Method and Specimen Size on Grinding-hardened Layer of 42CrMo Steel

作　　者：刘克铭[1] 马壮[1] 张连勇[1] 刘波[1] 

机构地区：[1]辽宁工程技术大学机械工程学院,辽宁阜新123000

出　　处：《热加工工艺》2012年第14期215-217,共3页Hot Working Technology

摘　　要：在MM7132平面磨床上对42CrMo钢进行了磨削淬火试验,研究了冷却方式及试样尺寸对淬硬层厚度及淬硬区组织的影响。结果表明:在湿磨条件下,随磨削深度的增加,淬硬层厚度总体呈增加趋势,淬硬层厚度均达到1.5 mm。磨削深度为0.2 mm、试件高度为100 mm干磨时,淬硬层厚度为0.75 mm,淬硬层显微硬度最高为771.8 HV;试件高度为150 mm时淬硬层厚度为0.5 mm,淬硬层显微硬度最高为605.4 HV。干磨时马氏体组织更细小。Grind hardening test was performed on the MM7132 surface grinder with 42CrMo steel. The effects of cooling method and specimen size on the depth of the hardened layer and the microstructure in the hardened region were studied. The results show that the depth of the hardened layer increases with the increase of the grinding depth under the condition of wet grinding. The hardened layer is 1.5mm in depth. When the grinding depth is 0.2mm and the height of specimen is 100mm, the hardened layer is 0.75 mm in depth and the maximum microhardness is 771.8 HV under the condition of dry grinding; when the height of specimen is 150 mm, the hardened layer is 0.5 mm in depth and the maximum microhardness is 605.4 HV with the same grinding condition. The martensite is more small under the condition of dry grinding.

关 键 词：冷却方式 磨削淬火 显微硬度 马氏体 

分 类 号：TG156.3[金属学及工艺—热处理]