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65Mn钢制造的金刚石圆锯片在淬火后发现软点缺陷,为分析缺陷产生原因,采用光学金相显微镜、扫描电子显微镜、洛氏硬度计、显微维氏硬度计、直读光谱仪等设备对试样组织类型、硬度分布和化学成分进行了对比分析。分析结果表明,软点缺陷尺寸约为12 mm,是由于淬火时局部区域冷却速度低或材料淬透性不足发生珠光体相变产生细珠光体组织造成的。可以通过改进淬火工艺、提高冷却速度和增加钢中合金含量、提高淬透性来避免淬火软点缺陷,其中将Cr的质量分数提高到0.2%是一种有效的改进措施。
65Mn steel diamond saw blade after quenching found in soft spot defects, in order to analyze the causes of defects, the use of optical metallography, scanning electron microscopy, Rockwell hardness, micro Vickers hardness, direct reading spectrometer and other equipment pairs Specimen type, hardness distribution and chemical composition were analyzed comparatively. The analysis results show that the defect size of soft spots is about 12 mm, which is caused by the pearlite structure of pearlite transformation caused by the low cooling rate in local area or insufficient hardenability of material during quenching. The quenching process can be improved, the cooling rate can be increased, the alloy content in the steel can be increased, the hardenability can be improved to avoid the soft spot defect of quenching. The improvement of the mass fraction of Cr to 0.2% is an effective improvement measure.