摘要
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。
Some soft point defects were found on diamond circular saw blades made from 65Mn steel after quenching. In order to find out the reason, the microstructure type, hardness distribution and chemical composition of samples were analyzed by optical metallographic microscope, scanning electron microscopy, Rockwell hardness tester, micro Vick- ers hardness tester and direct-reading spectrometer. The analysis results showed that the size of the soft point defects was about 12 mm, which was caused by fine pearlite structure due to the phase change of pearlite during quenching. In this process, the colling rate was partly low or the hardenability of material was not enough. The soft point defects during quenching could be avoided by improving the quenching process, enhancing the cooling rate and increasing the alloying content in steel to advance the hardenability. Wherein, increase Cr content to 0.2 % was an effective measure.
出处
《物理测试》
CAS
2016年第5期50-53,共4页
Physics Examination and Testing
关键词
65Mn
淬火
软点
缺陷分析
65Mn
quenching
soft point
defect analysis
