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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。
Using Gleeble-3500 thermal simulator to simulate the welding performance of CP800 with different peak temperatures and cooling rates, the effects of different peak temperatures and cooling rates on the microstructure, microhardness, impact properties and impact fracture morphology of CP800 influences. The results show that the new CP800 steel has good mechanical properties. Although as the peak temperature increases, the cooling rate increases the microstructure has some impact, but at room temperature impact properties and low temperature impact properties are relatively stable, the vast majority of impact fracture toughness fracture. However, only the peak temperature of 1320 ℃ and t8 / 5 of 100 s when low temperature brittle fracture occurs, at all other peak temperatures and t8 / 5 can be matched with the parent material and the mechanical properties of the organization. The test results provide the basis for the reasonable formulation of the welding process of CP800 steel.