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Increased resistance to hydrogen embrittlement in high-strength steels composed of granular bainite

机译:由颗粒贝氏体组成的高强度钢具有更高的抗氢脆性

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This paper presents two high-strength steels composed of granular bainite microstructure that have higher extrinsic resistance to hydrogen embrittlement (HE) than conventional tempered-martensite steel, because the granular bainite steel traps less hydrogen than tempered-martensite steel. However, the granular bainite steels had lower intrinsic HE resistance than tempered-martensite steel because hydrogen in granular bainite steels becomes concentrated at microstructures composed of martensite islands and retained austenite. The granular bainite steels with less sulfur showed better HE properties, because S degrades grain-boundary strength. Since the extrinsic properties correspond to the HE resistance that is relevant in industry, granular bainite steels are suitable for applications in hydrogen environment.
机译:本文介绍了两种由粒状贝氏体组织组成的高强度钢,它们比常规的回火马氏体钢具有更高的抗氢脆性(HE),因为粒状贝氏体钢所捕获的氢比回火马氏体钢少。但是,粒状贝氏体钢比回火马氏体钢具有较低的固有耐高温性,因为粒状贝氏体钢中的氢集中在由马氏体岛和残留奥氏体组成的微结构中。硫含量较低的粒状贝氏体钢表现出更好的HE性能,因为S降低了晶界强度。由于其外在性能与工业上的耐高温性能相对应,因此颗粒贝氏体钢适用于氢环境。

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