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Corrosion Fatigue Crack Propagation of Oil-Grade Alloy 718 in NaCl Solution.

机译：油品合金718在NaCl溶液中的腐蚀疲劳裂纹扩展。

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摘要

Nickel-based alloy 718 was originally developed for use in aircraft gas turbine engines, where there was a need for low cost, high temperature superalloys. Today, alloy 718 has evolved into a special grade (oilgrade) for use in the oil and gas industry for deep sea oil drilling where its good corrosion resistance and customization of mechanical properties via heat treatments are highly sought out. In recent decades, oil-grade Alloy 718 has been directly used in bottom-hole assembly components such as measurement while drilling tools and drill collars, where it applies a combination of good corrosion resistance, high fatigue/corrosion fatigue strength, and non-magnetism. However, as the modern oil and gas industry drilled into high pressure, high temperature, ultra-deep wells, the demand for increased strength and toughness is very critical for newly designed Alloy 718. Thus, a two-step aging treatment, which is used to maximize the yield strength of aerospace-grade Alloy 718, has been adopted and modified for oilgrade alloy 718. However, the effect of aging treatments on corrosion fatigue resistance of oil-grade alloy 718 has not been extensively investigated yet.;The aim of this study is to investigate the effect of three different aging treatments on corrosion fatigue crack growth (CFCG) of oil-grade Alloy 718 in NaCl solutions with various temperatures, concentrations, and waveforms.;The results show that there is no obvious effect of 3.5 wt.% NaCl solution on the CFCG rates of oil-grade alloy 718 in all three different aged conditions. However, the CFCG rates of oil-grade alloy 718 in 21 wt.% NaCl solution are increased as compared with the ones in air and in 3.5 wt.% NaCl solution. Moreover, aging treatments lead to lower CFCG rates of oil-grade alloy 718 in all tested conditions. Fractographical examinations of the fractured surfaces showed that the fatigue cracks propagated in the transgranular mode for all conditions.
机译：镍基合金718最初是为用于飞机燃气涡轮发动机而开发的，那里需要低成本，高温的高温合金。如今，718合金已发展成为用于深海石油钻探的石油和天然气行业的特殊等级（oilgrade），在该行业中，人们强烈寻求其良好的耐腐蚀性和通过热处理定制的机械性能。近几十年来，油品级718合金已直接用于井底钻具组合件，例如随钻工具和钻measurement的测量，其结合了良好的耐腐蚀性，高疲劳/腐蚀疲劳强度和非磁性。但是，随着现代石油和天然气行业钻进高压，高温，超深井，对于新设计的718合金，增加强度和韧性的需求变得非常关键。因此，采用了两步时效处理为了使航空级合金718的屈服强度最大化，已经对油级合金718进行了修改。但是，时效处理对油级合金718的耐腐蚀疲劳性的影响尚未得到广泛研究。本研究旨在研究三种不同时效处理对NaCl溶液中不同温度，浓度和波形的油级718合金的腐蚀疲劳裂纹扩展（CFCG）的影响;结果表明3.5没有明显的影响。在所有三种不同时效条件下，NaCl溶液的重量百分比对油品级合金718的CFCG速率的影响。然而，与在空气中和在3.5重量％的NaCl溶液中相比，在21重量％的NaCl溶液中的油级合金718的CFCG速率增加。此外，时效处理导致在所有测试条件下油级合金718的CFCG降低。断裂表面的分形检查​​表明，在所有条件下，疲劳裂纹均以跨晶模式传播。

著录项

  • 作者

    Nutter, Jared S.;

  • 作者单位

    West Virginia University.;

  • 授予单位 West Virginia University.;
  • 学科 Engineering Mechanical.
  • 学位 M.S.
  • 年度 2013
  • 页码 80 p.
  • 总页数 80
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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