基于铸辗连续成形的42CrMo铸造环坯高温力学性能及临界应变计算

发布时间：2018-05-06 08:25

  本文选题：金属材料 + 高温力学性能　； 参考：《机械工程学报》2017年06期

【摘要】：针对铸辗连续成形工艺中高温出模环形铸坯的易裂缺陷,采用Gleeble-3500热力模拟试验机对铸造42CrMo钢环坯进行高温拉伸试验,分析其高温强度、热塑性等力学行为,预测高温易裂敏感温度区。结果表明:铸造42CrMo钢的抗拉强度随温度的升高及应变速率的减小而减小。断面收缩率随应变速率增大而增大。1 100℃时,试样开始发生动态再结晶。试验条件下,材料存在两个脆性温度区,分别为红脆性温度区和高温脆性温度区。高温脆性是导致铸造42CrMo高温出模环坯产生裂纹的内在原因。能谱分析表明:硫化物、氧化物等夹杂物极易诱发裂纹的发生。根据试验结果,建立铸造42CrMo钢的峰值流动应力模型及产生裂纹的临界应变模型,该模型可为优化铸辗连续成形工艺,避免铸造缺陷,提高铸件质量提供指导。
[Abstract]:In view of the easy cracking defects of ring billet produced by high temperature die in continuous casting rolling process, the high temperature tensile test of cast 42CrMo steel ring billet was carried out by using Gleeble-3500 thermal simulation machine, and the mechanical behaviors such as high temperature strength, thermoplasticity and so on were analyzed. The sensitive temperature region of high temperature cracking is predicted. The results show that the tensile strength of cast 42CrMo steel decreases with the increase of temperature and the decrease of strain rate. Dynamic recrystallization occurs when the cross section shrinkage rate increases with strain rate increasing at 1.100 鈩，

本文编号：1851535