锻造及热处理工艺对20CrMoH钢组织与性能的影响

发布时间：2019-05-13 20:08

【摘要】：针对20Cr Mo H齿轮材料应用在电动汽车和工程机械变速箱产品中的齿轮设计与制造问题,研究了锻造、热处理工艺对20Cr Mo H齿轮钢材料组织和力学性能的影响。通过锻造、预备热处理和渗碳淬火全过程的系统联动控制等工艺方法,对20Cr Mo H钢进行试验分析与研究。结果表明:将锻造比控制在4以内,且镦粗比≥1.5,拔长比≤2.5,可消除带状组织,有效改善材料组织和力学性能;选择正火温度区间为890~930℃,渗碳后直接淬火和二次淬火扩散碳势为0.70%~0.85%,强扩比为1∶1,可以得到良好的金相组织和力学性能,保证合理的硬度梯度分布,以满足20Cr Mo H钢的齿轮零件质量要求。
[Abstract]:In order to solve the problem of gear design and manufacture of 20Cr Mo H gear material used in electric vehicle and construction machinery gearbox, the effects of forging and heat treatment on the microstructure and mechanical properties of 20Cr Mo H gear steel were studied. The experimental analysis and research of 20Cr Mo H steel were carried out by means of forging, preparatory heat treatment and systematic linkage control of Carburizing and quenching process. The results show that the banded structure can be eliminated and the microstructure and mechanical properties of the material can be effectively improved by controlling the forging ratio within 4, upsetting ratio 鈮，

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