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Sulfide Stress Cracking Susceptibility of Low Alloy Steels for Casing Application in Sour Environments.

机译:低合金钢在酸性环境中的硫化物应力开裂敏感性。

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摘要

Sulfide stress cracking (SSC) resistance of casing steels with different alloying chemistries (i.e. Ti-B and Mn-Cr-Mo) was evaluated using constant load tensile test and slow strain rate test in NACE-TM0177 environment. SSC resistance in terms of RAH2S/RAair and time to failure was found to decrease with increase of material strength. For more susceptible steels, a mix mode of transgranular and intergranular fracture was observed. For less susceptible steels, intergranular fracture was less prevalent.;Inclusions were found to be the dominant factor contributing to SSC susceptibility. Mn-Cr-Mo steels were more susceptible to inclusions than Ti-B steels. Cracking was found to be initiated mainly from elongated inclusions such as MnS, Al-Si-O, or large globular Ca-enriched oxide inclusions. Clustering of inclusions were main SSC initiation sites. The distribution and morphology of carbides played an important role in SSC propagation. A uniform microstructure with fine globular carbides was found to improve SSC resistance.
机译:在NACE-TM0177环境中使用恒定载荷拉伸试验和慢应变速率试验评估了具有不同合金化学成分(即Ti-B和Mn-Cr-Mo)的套管钢的抗硫化物应力开裂(SSC)能力。随着材料强度的增加,发现RAH2S / RAair和失效时间方面的SSC抵抗力降低。对于易受影响的钢,观察到了跨晶和晶间断裂的混合模式。对于敏感性较低的钢,晶间断裂的发生率较低。;发现夹杂物是造成SSC敏感性的主要因素。 Mn-Cr-Mo钢比Ti-B钢更容易夹杂。发现裂纹主要是由诸如MnS,Al-Si-O之类的细长夹杂物或大球形的富含Ca的氧化物夹杂物引起的。夹杂物的聚集是SSC的主要起始位点。碳化物的分布和形态在SSC的传播中起着重要作用。发现具有细小球形碳化物的均匀微观结构可改善耐SSC性能。

著录项

  • 作者

    Huang, Weishan.;

  • 作者单位

    University of Alberta (Canada).;

  • 授予单位 University of Alberta (Canada).;
  • 学科 Chemical engineering.;Materials science.
  • 学位 M.S.
  • 年度 2012
  • 页码 164 p.
  • 总页数 164
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 老年病学;
  • 关键词

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