论文部分内容阅读
一、前言解放牌汽车发动机上的柱螺栓(304000FB),是用15MnVB 低碳马氏体高强度材料制造的。其使用性能较好,但也曾发生过断裂现象。为彻底杜绝螺栓断裂,我们进行了试验研究。我们认为,经淬火—回火—电镀后的柱螺栓,在低应力拉伸载荷作用下经过短时间而发生的脆断,是属于氢致延迟断裂。为彻底弄清这一问题,我们采用不同碳含量(高、中、低碳)以及不同同火温度的15MnVB低碳马氏体钢进行了试验研究。二、试验用材料及试验方法1.试验用钢的化学成分试验用钢的化学成分见表1。
First, the preface Jiefang card car engine studs (304000FB), is made of 15MnVB low-carbon martensite high-strength materials. Its use of performance is better, but also had broken phenomenon. In order to completely eliminate the bolt fracture, we conducted a pilot study. In our opinion, the brittle fracture occurred after quenching-tempering-plating of studs under a low tensile tensile load for a short period of time belongs to the hydrogen-induced delayed fracture. In order to fully understand this problem, we conducted experiments with 15MnVB low-carbon martensitic steels with different carbon contents (high, medium and low carbon) and different tempering temperatures. Second, the test materials and test methods 1. Test steel chemical composition of the steel used in the chemical composition shown in Table 1.