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首页> 外文期刊>Materials Science and Engineering >Microstructure characteristics and temperature-dependent high cycle fatigue behavior of advanced 9% Cr/CrMoV dissimilarly welded joint
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Microstructure characteristics and temperature-dependent high cycle fatigue behavior of advanced 9% Cr/CrMoV dissimilarly welded joint

机译：先进的9％Cr / CrMoV异种焊接接头的组织特性和温度相关的高周疲劳行为

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摘要

Advanced 9% Cr and CrMoV steels chosen as candidate materials are first welded by narrow-gap submerged arc welding (NG-SAW) to fabricate the heavy section rotor. The present work focuses on studying the high-cycle fatigue (HCF) behavior of advanced 9% Cr/CrMoV dissimilarly welded joint at different temperatures. Conditional fatigue strength of this dissimilarly welded joint was obtained by HCF tests at room temperature (RT), 400 ℃ and 470 ℃. It was observed that the failure occurred at the side of CrMoV base metal (BM), weld metal (WM) and heat affected zone (HAZ) of CrMoV side over 5 × 10~7 cycles for the specimens tested at RT, 400 ℃ and 470 ℃ The detailed microstructures of BMs, WMs and HAZs as well as fracture appearance were observed by optical microscopy (OM) and scanning electron microscopy (SEM). Precipitation and aggregation of carbides along the grain boundaries were clearly detected with the increase of temperature, which brought a negative effect on the fatigue properties. It is interesting to note that the inclusion size leading to crack initiation became smaller for the HCF test at higher temperature. Therefore, reduction in the inclusion size in a welded joint helps to improve the HCF performance at high temperature.
机译：首先，通过窄间隙埋弧焊（NG-SAW）焊接被选为候选材料的高级9％Cr和CrMoV钢，以制造重型转子。目前的工作重点是研究先进的9％Cr / CrMoV异种焊接接头在不同温度下的高周疲劳（HCF）行为。通过室温（RT），400℃和470℃下的HCF测试获得了这种异种焊接接头的条件疲劳强度。对于在室温，400℃和室温下测试的试样，经过5×10〜7个循环后，观察到了失效发生在CrMoV基底金属（BM），焊缝金属（WM）和热影响区（HAZ）的侧面。 470℃用光学显微镜（OM）和扫描电子显微镜（SEM）观察了BMs，WMs和HAZs的详细微观结构以及断裂外观。随着温度的升高，碳化物沿晶界的沉淀和聚集被清楚地检测到，这对疲劳性能产生了负面影响。有趣的是，在高温下进行HCF测试时，导致裂纹萌生的夹杂物尺寸变小了。因此，减小焊接接头中的夹杂物尺寸有助于改善高温下的HCF性能。

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  • 来源
    《Materials Science and Engineering》 |2014年第6期|98-106|共9页
  • 作者

    Qingjun Wu; Fenggui Lu; Haichao Cui; Yuming Ding; Xia liu; Yulai Gao;

  • 作者单位

    Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240, PR China,Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, Shanghai 200072, PR China;

    Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co. Ltd., Shanghai 200240, PR China;

    Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co. Ltd., Shanghai 200240, PR China;

    Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, Shanghai 200072, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    High-cycle fatigue; Dissimilarly welded joint; Fracture location; Inclusion size; 9 Cr/CrMoV steels;

    机译：高周疲劳;异种焊接接头;骨折部位;夹杂物大小;9％Cr / CrMoV钢;

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