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采用光学金相显微镜、扫描电镜观察,测试力学性能,研究不同焊后热处理对2.25Cr4 Mo-0.25V钢焊缝力学性能、夏比冲击吸收能量和显微组织的影响。结果表明,回火参数增加,焊缝力学性能提高。焊态硬度最高,冲击吸收能量最小,组织主要为板条贝氏体,贝氏体粗大且板条平行;最小焊后热处理后硬度下降,冲击吸收能量提高,组织为板条贝氏体和粒状贝氏体;最大焊后热处理后焊缝硬度和母材接近,冲击吸收能量均在153J以上,板条贝氏体细化,粒状贝氏体增加,焊缝的力学性能相对最好。
The effects of different post-weld heat treatments on the mechanical properties, Charpy impact energy and microstructure of 2.25Cr4 Mo-0.25V steel were studied by optical microscope, scanning electron microscope and mechanical properties test. The results show that the tempering parameters increase, the mechanical properties of the weld increase. The highest welding hardness and the least impact absorption energy. The microstructure mainly consists of lath bainite and coarse bainite and parallel lath. The hardness after minimum post-weld heat treatment decreases and the impact absorption energy increases. The lath bainite and granular Bainite. The weld hardness and the base metal close to the maximum postweld heat treatment are all above 153J, the lath bainite is refined and the granular bainite is increased, and the mechanical properties of the weld are relatively best.