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通过电子拉伸、冲击、显微硬度测试及微观组织分析,研究了P92钢焊接接头在不同焊后回火温度下的组织和力学性能。结果表明,760到820℃焊后回火处理,可有效提高P92钢焊缝的冲击韧性,降低焊缝及热影响区的硬度;760、780、800℃回火后,P92钢焊接接头均可获得良好的组织状态和综合力学性能;考虑到P92管道现场施工中的回火处理温度控制误差,选择780℃作为P92管道的回火温度是合适的。
The microstructure and mechanical properties of P92 steel welded joints at different post-weld tempering temperatures were studied by means of electronic tensile test, impact test, microhardness test and microstructure analysis. The results show that the post-weld tempering treatment from 760 to 820 ℃ can effectively improve the impact toughness of P92 steel weld and reduce the hardness of weld and heat affected zone. After tempering at 760 and 780 ℃, the welded joints of P92 steel Get a good state of the organization and mechanical properties; taking into account the field construction of P92 pipeline tempering temperature control error, choose 780 ℃ as P92 pipe tempering temperature is appropriate.