复相钢CP800焊接性能的研究
Welding Ability of Multiphase Steel CP800
韩 坤， 曾伟明， 张 梅， 李 麟
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作者单位：(上海大学 材料科学与工程学院，上海 200072)
中文关键字：CP800； 焊接模拟； 组织； 力学性能
英文关键字：CP800; welding simulation; microstructure; mechanical property
中文摘要：用Gleeble-3500热模拟机对CP800的焊接性能进行不同峰值温度及冷却速度的焊接模拟实验，分析了不同峰值温度和冷却速度对CP800金相组织、显微硬度、冲击性能和冲击断口形貌的影响。结果表明，新型CP800钢的综合力学性能良好。虽然随着峰值温度增加、冷却速度增大对金相组织有一些影响，但常温冲击性能和低温冲击性能比较稳定，绝大多数冲击断口均为韧性断口。而只有峰值温度1320 ℃和t8/5为100 s时样品才发生低温脆性断裂, 在其他各种峰温及t8/5下都能得到与母材相对匹配的组织以及力学性能。试验结果为CP800钢焊接工艺的合理制定提供了依据。
英文摘要：The welding ability of CP800 under different peak temperature and cooling rate was detected by Gleeble-3500 thermal simulator, microstructure test, hardness test, impact toughness test and the observation of impact fracture morphology of CP800 . The results show that CP800 steel has good mechanical properties and toughness. With the increase of peaking temperature and cooling rate, the microstructure of the samples changes a lot while the impact performance at room temperature and low temperature is stable and the impact fracture is ductile. When the peaking temperature is 1320 ℃ and the cooling rate is 100 s, the brittle fracture occurs at low temperature. However, the microstructure and mechanical properties relatively match with the base metal under other peaking temperature and cooling rate. The experiment results provide a reasonable basis for the development of CP800 steel welding process.