论文部分内容阅读
对20CrMnMo汽车齿轮模具进行不同工艺的退火处理,并进行了不同退火工艺下试样的表面硬度测试、显微组织观察和冲击试验。结果表明,与770、890℃的退火加热温度相比,选择830℃退火更有利于降低20CrMnMo汽车齿轮模具锻造后的硬度,细化晶粒,得到颗粒状弥散分布的碳化物,提高韧性,延长模具的使用寿命;其表面硬度降至98HB,剪切断面率高达89%。
The 20CrMnMo automotive gear mold annealing process for different processes, and carried out under different annealing process the surface hardness of the sample test, microstructure observation and impact test. The results show that compared with the annealing temperature of 770 ℃ and 890 ℃, the annealing at 830 ℃ is more effective in reducing the hardness of forged 20CrMnMo gear molds after forging, and the grain size is refined to obtain the carbide with granular dispersion distribution to improve the toughness and elongation Mold life; its surface hardness down to 98HB, shear section rate as high as 89%.