Precipitation behavior of P550 steel for non-magnetic drill collars during isothermal aging at 650–900℃
作者机构：School of MetallurgyNortheastern UniversityShenyang 110819LiaoningChina State Key Laboratory of Metal Material for Marine Equipment and ApplicationAnshan 114002LiaoningChina
出 版 物：《Journal of Iron and Steel Research(International)》 (钢铁研究学报（英文版）)
年 卷 期：2022年第29卷第4期
页 面：636-646页
核心收录：
学科分类：0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学]
基 金：the National Natural Science Foundation of China(Grant Nos.U1960203 and 51774074) Shanxi Municipal Major Science&Technology Project(Grant No.20181101014) Fundamental Research Funds for the Central Universities(Grant Nos.N172512033 and N2024005-4) Talent Project of Revitalizing Liaoning(XLYC1902046) State Key Laboratory of Metal Material for Marine Equipment and Application(Grant No.HG-SKL(2019)13)
主 题：P550 steel Non-magnetic drill collar Precipitation behavior Cellular Cr_(2)N r Phase Nitrogen
摘 要：Precipitation behavior of P550 steel for non-magnetic drill collars was investigated by microstructure characterization as well as thermodynamic *** results demonstrate that the main precipitate formed at 650–900℃was cellular Cr_(2)N,and its precipitation depended heavily on the aging *** most sensitive precipitation temperature of cellular Cr_(2)N was 750℃.At 750℃,the cellular Cr_(2)N exhibited fast-slow precipitation kinetics with the aging time *** initial precipitation of cellular Cr_(2)N was governed by the short-range intergranular diffusion of *** long-term aging,its growth was controlled by the long-range bulk diffusion of *** addition,cellular Cr_(2)N induced the precipitation of r phase ahead of the cell after long period of *** the nitrogen content resulted in the increment of both the nucleation site and the driving force for the cellular Cr_(2)N,which jointly promoted its precipitation.
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