摘要
基于有限元软件SYSWELD对U71Mn钢轨轨面堆焊温度场进行数值模拟,研究了预热、后热、预热+后热三种焊接工艺对焊接冷却时间(t8/5)的影响,并对焊接热影响区的组织进行观察,最后对模拟结果进行了试验验证。结果表明:预热、后热、预热+后热三种焊接工艺均能延长t8/5,预热+后热的效果最佳,后热的效果优于预热的;预热+后热工艺是防止出现淬硬组织和冷裂纹行之有效的措施;采用模拟得到的焊接工艺可以达到消除马氏体组织的目的,试验结果验证了模拟结果的准确性。
Based on software SYSWELD, the temperature field of U71Mn rail steel overlay welding was simulated. The influence of preheating, post-heating and preheating ＋ post-heating on the cooling time （t8/5） was studied , and the microstructure of heat effect zone was characterized to verify the correctness of the numerical simulation. The results showed that all the welding processes can prolong the cooling time. The effect of preheating ＋post-heating process was the best, and post-heating was better than preheating. Preheating ＋ post-heating process was an effective measure to control the hardening structure and cold crack. The calculated process can be used to control the hardening structure, and the simulation results were verified by experiment.
出处
《机械工程材料》
CAS
CSCD
北大核心
2015年第8期103-106,共4页
Materials For Mechanical Engineering
