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采用ф1.2 mm实芯焊丝对CrMo耐热钢进行了热输入量为8和18 kJ/cm的富氩气体保护焊试验,对焊板整体进行焊后热处理后,研究了焊缝金属的组织与性能。结果表明,随着热输入量从8 kJ/cm增加至18 kJ/cm,焊缝金属组织由板条贝氏体(LB)+粒状贝氏体(GB)转变为GB+少量多边形铁素体(PF);随着回火温度从620℃升高至660℃,焊缝金属中M-A组元逐渐分解,碳化物在基体上弥散析出;同时,焊缝金属韧性随热输入增加和回火温度降低而降低,硬度随热输入增加和回火温度升高而减小。
The Ф1.2 mm solid wire was used to test the CrMo heat-resistant steel with argon-rich gas with heat inputs of 8 and 18 kJ / cm. After welding the entire plate to the post-weld heat treatment, the microstructure of the weld metal And performance. The results show that as the heat input increases from 8 kJ / cm to 18 kJ / cm, the weld metal microstructure changes from lath bainite (LB) + granular bainite (GB) to GB + minor polygonal ferrite PF). As the tempering temperature increased from 620 ℃ to 660 ℃, the MA components in the weld metal gradually decomposed and carbides dispersed and precipitated on the matrix. Meanwhile, the toughness of the weld metal increased with the heat input and the tempering temperature decreased While the hardness decreases as the heat input increases and the tempering temperature increases.