P91弯管外弧侧硬度降低原因分析  

Analysis of Hardness Reduction on Outer Arc Side of P91 Bend Pipe

作　　者：赵志明[1] 夏静[2] Zhao Zhiming;Xia Jing(Taiyuan Boiler Group Co.,Ltd.,Taiyuan Shanxi 030008,China;Shanxi Medical University,Taiyuan Shanxi 030001,China)

机构地区：[1]太原锅炉集团有限公司,山西太原030008 [2]山西医科大学,山西太原030001

出　　处：《山西冶金》2024年第6期55-56,99,共3页Shanxi Metallurgy

摘　　要：介绍了P91钢管冷弯回火后弯头外侧硬度的降低情况,结合弯曲试验、硬度试验和金相分析,得出:对于冷弯变形量较小的P91钢管,经780℃回火,弯管外侧的硬度值一般比较稳定,金相组织只发生回复;当P91冷弯变形量较大时,弯管外侧显微组织发生再结晶,硬度值迅速下降。This paper introduces the hardness reduction of the outer elbow of P91 steel pipe after cold bending and tempering.Combining with bending test,hardness test and metallographic analysis,it is suggested that the hardness value of the outer elbow of P91 steel pipe with small cold bending deformation is generally relatively stable after tempering at 780℃,and the metallographic structure only recovers.When the cold bending deformation of P91 is large,the microstructure of the outside of the bending tube recrystallizes,and the hardness decreases rapidly.

关 键 词：P91钢管 冷弯 回火处理 硬度 再结晶 

分 类 号：TG113.251[金属学及工艺—物理冶金]