两种不同冶金工艺生产的60Si2CrVA弹簧钢的高周疲劳性能

来源期刊：钢铁2009年第2期

论文作者：郝立群 惠卫军 项金钟 惠荣 翁宇庆

文章页码：64 - 68

关键词：冶金生产工艺； 60Si2CrVA弹簧钢； 高周疲劳； 非金属夹杂物

Key words：metallurgical process； 60Si2CrVA spring steel； high-cycle fatigue； non-metallic inclusion

摘    要：采用旋转弯曲疲劳试验研究了两种不同冶金工艺生产的60Si2CrVA弹簧钢的高周疲劳破坏行为。结果表明,尽管两种试验料的氧含量接近,但两者夹杂物特征的差异使其疲劳性能存在明显的差异。与采用电炉+LF+VD+CC工艺生产的X8料相比,采用转炉+LF+RH+CC工艺生产的X6料中的夹杂物数量明显减少,夹杂物尺寸较小,同时还减少了不规则的多棱角富Al₂O₃夹杂,因而后者的疲劳强度得到明显提高,并具有良好的疲劳寿命稳定性。

Abstract: The high-cycle fatigue fracture behavior of 60Si2CrVA spring steels produced by two different metallurgical processes were studied by using rotating bar two-point bending fatigue machine.The experimental results indicate that the characteristics of the inclusions in these two steels were different,which was the main reason for the significant difference of their fatigue properties,although their oxygen content was almost equal.Compared with X8 steel produced by the metallurgical process of EAF+LF+VD+CC,the number and size of inclusions in X6 steel produced by the metallurgical process of LD+LF+RH+CC was decreased obviously,especially the number of Al₂O₃-riched hard inclusions was reduced,therefore the latter had not only higher fatigue strength,but also higher fatigue life stability.