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precipitation behavior of p550 steel for non-magnetic drill collars during isothermal aging at 650–900℃

Journal of Iron and Steel Research International 2022年第4期29卷 636-646页

作者： Li-wei Xu Huai-bei Zheng Hua-bing Li Zhou-hua Jiang Shu-cai Zhang Jiang-tao Yu Hao Feng Yue Lin School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina State Key Laboratory of Metal Material for Marine Equipment and Application Anshan 114002LiaoningChina

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.

关键词： p550 steel Non-magnetic drill collar precipitation behavior Cellular Cr_(2)N r phase Nitrogen

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论p550与Ni718超强异种钢的手工TIG焊接工艺

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现代焊接 2016年第12期 31-33页

作者：魏宏兵王璐刘卫华郭学文苏州威尔汉姆管道科技有限公司中国核工业第五建设有限公司上海交通大学

本文主要论述了抗拉强度1000Mpa以上，延伸率20％的铁铬锰系p550与镍铬铁系Ni718异种材料采用手TTIG焊接时，各焊接工艺因素的影响能力。对比了低热输入及层间温度控制、ERNiCrMo-3的焊缝低强匹配设计、脉冲与非脉冲的TIG焊接模式等工... 详细信息

本文主要论述了抗拉强度1000Mpa以上，延伸率20％的铁铬锰系p550与镍铬铁系Ni718异种材料采用手TTIG焊接时，各焊接工艺因素的影响能力。对比了低热输入及层间温度控制、ERNiCrMo-3的焊缝低强匹配设计、脉冲与非脉冲的TIG焊接模式等工艺因素条件的焊接试验结果；分析研究发现非脉冲模式时弯曲试件全部断裂，而脉冲模式时弯曲试件全部合格，试验证明了脉冲模式焊接提高焊接接头性能，尤其对于超强钢焊接，在同等工艺的情况下，脉冲模式作用对焊接接头的晶粒细化及机械性能提高有着显著的贡献。

关键词： p550 Ni718 超强钢脉冲

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