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采用脉冲氩弧焊接工艺、高温加速模拟工况、高温持久、常温力学性能试验研究了不同焊缝强度匹配条件下,马氏体耐热钢9Cr1MoVNbN与贝氏体耐热钢12Cr2MoWVTiB焊接接头的力学性能、高温强度、蠕变损伤及界面破坏特征。研究结果表明;焊前预热250℃,焊后回火750℃×1h条件下,加速模拟运行500h,1000h,1500h后低匹配焊接接头的界面蠕变损伤较严重,力学性能下降明显,失效倾向较大;而中匹配接头的蠕变损伤及失效倾向较小。中匹配与低匹配接头的持久强度比较接近;高匹配接头的持久强度最低。因此,对于9Cr1MoVNbN/12Cr2MoWVTiB异种钢焊接接头采用中匹配比较合适。
The mechanical properties of welded joint of 9Cr1MoVNbN and bainitic heat-resistant steel 12Cr2MoWVTiB were studied with pulsed argon arc welding, high temperature accelerated simulation, long-lasting high temperature and mechanical properties at room temperature under different welding seam strength matching conditions , High temperature strength, creep damage and interface failure characteristics. The results show that under the conditions of preheating 250 ℃ and post-weld tempering 750 ℃ × 1h, the interfacial creep damage of low-matching welded joints after accelerated simulative operation for 500h, 1000h and 1500h is more serious, the mechanical properties decrease significantly, and the failure tendency Larger; while the mating connector creep damage and failure tendencies. The long-term strength of the middle-matched and the low-matched connectors is close; the high-matched connectors have the lowest endurance. Therefore, for 9Cr1MoVNbN / 12Cr2MoWVTiB dissimilar steel welded joints used in the more appropriate match.