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用Gleeble1500热模拟机对含铜超低碳贝氏体钢进行不同焊接工艺下热模拟试验。研究了焊接热影响区的组织、性能。探讨了不同t85对钢中贝氏体组织组成及形态的影响以及组织与低温韧性的关系。用径迹显微照相技术(PTA)显示了硼在热影响区的行为。结果表明:在不同焊接条件下,此类钢焊接热影响区均具有较好的低温韧性和较低的韧脆转变温度。当以中等速率冷却时,高温时生成的一定量的粒状贝氏体可有效地分割奥氏体晶粒,使后生成的板条贝氏体更细,从而获得最佳的低温韧性。
Thermal simulation of copper-containing ultra-low carbon bainitic steel under different welding conditions with Gleeble1500 thermal simulator. The microstructure and properties of HAZ were studied. The effects of different t85 on the microstructure and morphology of bainite in steel and the relationship between microstructure and low temperature toughness were discussed. The behavior of boron in the heat-affected zone is shown with track photomicrography (PTA). The results show that under different welding conditions, the HAZ of these steels have good low temperature toughness and low ductile-brittle transition temperature. When cooled at a moderate rate, a certain amount of granular bainite produced at high temperature effectively separates the austenite grains, resulting in finer bainite of the resulting slab, resulting in the best low temperature toughness.