论文部分内容阅读
汽车曲轴用钢42CrMo要求在不影响力学性能的前提下,具有较好的切削性。传统的钢种无法满足使用需求,通过在钢中添加B、N元素,并对钢中夹杂物进行控制,以满足性能要求。首先通过坩埚熔炼实验得到不同B、N含量的试样;其次利用FactSage软件计算出理想条件下不同B、N含量的钢液中各种夹杂物的析出量及析出温度;然后通过对试样设置不同的冷却方式和定向凝固实验,得到钢中BN夹杂物的形貌、尺寸及分布的影响因素;最后,通过切削实验研究了夹杂物对切削性能的影响因素,最终得到理想切削性能的BN型易切削钢。结果表明,尺寸较小而密度较大的BN夹杂物对钢的切削性能的改善作用更好。切削性较好的试样,其切削性能已达到与硫系易切削钢Y1215同等水平。
Automotive crankshaft steel 42CrMo requirements without affecting the mechanical properties of the premise, with better machinability. Traditional steels can not meet the needs of the use, by adding B, N elements in the steel, and control of inclusions in the steel to meet the performance requirements. Firstly, the samples with different B and N contents were obtained through the crucible melting experiment. Secondly, the amount and precipitation temperature of various inclusions in the molten steel with different B and N contents under the ideal conditions were calculated by FactSage software. Then, Different cooling methods and directional solidification experiments to get the influence factors of the morphology, size and distribution of BN inclusions in steel. Finally, the influencing factors on the cutting performance of the inclusions were studied by cutting experiments, finally the BN type Free cutting steel. The results show that BN inclusions with smaller size and larger density have a better effect on the machinability of steel. Better machinability of the sample, the cutting performance has reached the sulfur-free cutting steel Y1215 the same level.