Evaluating the Hydrogen Embrittlement Susceptibility of Aged 2205 Duplex Stainless Steel Containing Brittle Sigma Phase,Steel Research International

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Evaluating the Hydrogen Embrittlement Susceptibility of Aged 2205 Duplex Stainless Steel Containing Brittle Sigma Phase
Steel Research International ( IF 1.9 ) Pub Date : 2021-05-01 , DOI: 10.1002/srin.202000693
Loyslene Rabelo Fernandes ₁ , Lisa Claeys ₂ , Margot Pinson ₂ , Tom Depover ₂ , Dagoberto Brandão Santos ₁ , Kim Verbeken ₂

Affiliation

Duplex stainless steels (DSS) have a two-phase microstructure of ferrite and austenite which results in a high strength combined with high ductility and good corrosion resistance. However, when DSS are heated to an inappropriate temperature range, e.g., during welding, the brittle sigma phase forms which deteriorates the mechanical properties. In the present work, a heat treatment is performed to intentionally create this deleterious phase. Hydrogen is introduced in this alloy to investigate the combined effect of embrittling phases (sigma phase) and hydrogen. Melt extraction analysis is performed to quantify the hydrogen uptake capacity in the steel. In-situ mechanical tests are used to assess the hydrogen embrittlement susceptibility. The uncharged DSS shows a low ductility and almost no hydrogen embrittlement is observed via an in-situ tensile test set-up due to its intrinsic brittle nature under tensile mode. Complementary in-situ bending tests which are more suitable for an intrinsically brittle material are done to further evaluate the role of hydrogen on the mechanical integrity. Hydrogen charging does indeed result in additional embrittlement in the in-situ bending set-up. The reason is thought to be the faster initiation, interconnection and propagation of cracks in the presence of hydrogen, as indicated by microstructural characterization.

中文翻译：

评估含有脆性 Sigma 相的老化 2205 双相不锈钢的氢脆敏感性

双相不锈钢 (DSS) 具有铁素体和奥氏体的两相微观结构，因此具有高强度、高延展性和良好的耐腐蚀性。然而，当 DSS 被加热到不合适的温度范围时，例如在焊接过程中，会形成脆性 sigma 相，这会降低机械性能。在目前的工作中，进行热处理以故意产生这种有害相。在该合金中引入氢以研究脆化相（σ 相）和氢的综合影响。进行熔体萃取分析以量化钢中的氢吸收能力。原位机械测试用于评估氢脆敏感性。由于其在拉伸模式下的固有脆性，不带电的 DSS 显示出低延展性，并且通过原位拉伸试验装置几乎没有观察到氢脆。进行了更适合于固有脆性材料的补充原位弯曲试验，以进一步评估氢对机械完整性的作用。充氢确实会导致原位弯曲装置的额外脆化。其原因被认为是在氢存在的情况下，裂纹的萌生、互连和传播速度更快，如微观结构表征所示。进行了更适合于固有脆性材料的补充原位弯曲试验，以进一步评估氢对机械完整性的作用。充氢确实会导致原位弯曲装置的额外脆化。其原因被认为是在氢存在下裂纹的更快启动、互连和传播，如微观结构表征所示。进行了更适合于固有脆性材料的补充原位弯曲试验，以进一步评估氢对机械完整性的作用。充氢确实会导致原位弯曲装置的额外脆化。其原因被认为是在氢存在的情况下，裂纹的萌生、互连和传播速度更快，如微观结构表征所示。

更新日期：2021-05-01

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