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采用焊接热模拟技术对屈服强度为850 MPa管线用平板进行了热影响区的模拟试验,研究该钢在不同峰值温度和冷却时间下的组织与性能,测定了其热影响区的显微硬度。结果表明,钢板基体组织为下贝氏体,经历不同的热循环后,热影响区组织有不同程度的变化;在所选择的工艺参数范围内,热影响区的显微硬度没有降低;在(α+γ)两相区受热后的冲击吸收能量降低了31 J,是整个热影响区的脆性区域。
The heat affected zone (HAZ) of 850 MPa pipelines with yield strength of 850 MPa was simulated by welding thermal simulation technology. The microstructure and properties of the steel under different peak temperature and cooling time were studied. The microhardness of HAZ was measured. The results show that the microstructure of the steel substrate is lower bainite, and the microstructure of the heat affected zone (HAZ) changes to some extent after being subjected to different thermal cycles. The microhardness of the HAZ does not decrease in the range of the selected technological parameters. α + γ) The shock absorption energy of the two-phase region is reduced by 31 J, which is the brittle region of the entire heat-affected zone.