Development of 38MnVS Non-quenched and Tempered Steel Automobile Semi-Axle
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摘要: 开发了38MnVS非调质钢汽车半轴，研究了热锻后冷却速率对38MnVS非调质钢半轴显微组织、力学性能的影响，并与42CrMo调质钢半轴进行了对比，讨论了半轴疲劳寿命的主要影响因素。结果表明：通过热锻后风冷可减小38MnVS非调质钢中铁素体尺寸和珠光体片层间距，冲击韧性由空冷后的16.84 J提高到风冷后的43.74 J；38MnVS非调质钢具有良好的淬透性；38MnVS非调质钢半轴的疲劳寿命可达到42CrMo调质钢半轴的水平，并且通过减小花键模数、增大花键齿根过渡圆角半径以及适当地增加硬化层深度可将38MnVS非调质钢半轴的疲劳寿命提高到30万次以上，可以代替42CrMo调质钢半轴。Abstract: The 38MnVS non-quenched and tempered steel semi-axle was developed. The effect of cooling rate after hot forging on microstructure and mechanical properties of 38MnVS non-quenched and tempered steel semi-axle was studied and cpmpared with 42CrMo quenched and tempered semi-axle. The main factors affecting the fatigue life of the semi-axle were discussed. The results show that the size of ferrite and pearlite lamellar spacing of 38MnVS non-quenched and tempered steel reduced by force air cooling after hot forging, and the impact toughness increased from 16.8 J after air cooling to 43.7 J after force air cooling. 38MnVS non-quenched and tempered steel had good hardenability. The fatigue life of 38MnVS non-quenched and tempered steel semi-axle was equivalent to that of the 42CrMo quenched and tempered steel semi-axle, and the fatigue life of 38MnVS non-quenched and tempered steel semi-axle could reach more than 300 000 times by reducing the spline modulus, increasing spline root fillet radius and increasing the depth of the hardened layer appropriately that could replace 42CrMo quenched and tempered steel semi-axle.
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Keywords:
- semi-axle /
- non-quenched and tempered steel /
- hardenability /
- fatigue life /
- microstructure
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