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<p>An investigation (susceptibility) of stress corrosion cracking and hydrogen environment of a commercial austenitic steel SS316 is carried out in two different chemical environments (35% concentrated solution nitric acid solution at 70°C and 35% ammonium thiocyanate) under low strain rate. The materials susceptible to these environments can be significant hazards in industrial application. Stainless steel is one of the widely employed across various industries because, in most environments, they are inert. However, under certain applications, even stainless steel is not corrosion-free. A small surface flaw induced chemically can initiate and propagate fracture in the component. The microcracks induced on the surface are critical to propagation of crack. The effect of chemically induced flaws due to SCC and HE and cracking mode of SCC and HE was investigated. The lower susceptibility of SCC was probably due to the impeding effect of passive layer on the SCC propagation, whereas higher HE susceptibility was attributed to the facilitating effect of hydrogen on the crack initiation and propagation. In this paper, the tensile test results of SS316, before and after the exposure to the respective environments, were presented. The experiments have proved that the effect of stress corrosion is more sensitive than hydrogen embrittlement and is distinct in behavior. The fracture surface was inspected using a scanning electron microscope (SEM). Although the ductile fracture dominates, the fractography shows the intergranular rupture affected by the hydrogen near the surface.</p>

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Environmentally Assisted Tensile Failures of Austenitic Steel in Simulated Corrosive Environments

  • 期刊论文

  • 发表日期：

    2025年1月13日

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  • H. K. Basukumar,
  • K. V. Arun

摘要

An investigation (susceptibility) of stress corrosion cracking and hydrogen environment of a commercial austenitic steel SS316 is carried out in two different chemical environments (35% concentrated solution nitric acid solution at 70°C and 35% ammonium thiocyanate) under low strain rate. The materials susceptible to these environments can be significant hazards in industrial application. Stainless steel is one of the widely employed across various industries because, in most environments, they are inert. However, under certain applications, even stainless steel is not corrosion-free. A small surface flaw induced chemically can initiate and propagate fracture in the component. The microcracks induced on the surface are critical to propagation of crack. The effect of chemically induced flaws due to SCC and HE and cracking mode of SCC and HE was investigated. The lower susceptibility of SCC was probably due to the impeding effect of passive layer on the SCC propagation, whereas higher HE susceptibility was attributed to the facilitating effect of hydrogen on the crack initiation and propagation. In this paper, the tensile test results of SS316, before and after the exposure to the respective environments, were presented. The experiments have proved that the effect of stress corrosion is more sensitive than hydrogen embrittlement and is distinct in behavior. The fracture surface was inspected using a scanning electron microscope (SEM). Although the ductile fracture dominates, the fractography shows the intergranular rupture affected by the hydrogen near the surface.