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首页> 外文期刊>Journal of Materials Engineering and Performance >The Role of Silicon Content on Environmental Degradations of T91 Steels
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The Role of Silicon Content on Environmental Degradations of T91 Steels

机译：硅含量对T91钢环境降解的作用

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摘要

T91 grade steels showed a gradual enhancement in tensile ductility at ambient temperature due to an increase in Si content from 0.5 to 2.0 weight percent (wt.%). However, the ultimate tensile strength was reduced only above 1.5 wt.% Si. The corrosion potential became more active in an acidic solution with increasing temperature. The cracking susceptibility in a similar environment under a slow-strain-rate (SSR) condition was enhanced at higher temperatures showing reduced ductility, time to failure, and true failure stress. Cathodic potentials applied to the test specimens in SSR testing caused an enhanced cracking tendency at 30 and 60 ℃, suggesting hydrogen embrittlement as a possible mechanism of failure. Cracking of precracked and wedge-loaded double-cantilever-beam specimens was enhanced at higher initial stress intensity factors. In general, steels with 2.0 wt.% Si showed inferior corrosion resistance. A combination of cleavage and intergranular brittle failure was seen in the tested specimens depending on the type of testing.
机译：由于Si含量从0.5％（重量）增加到2.0％（重量），T91级钢在环境温度下显示出拉伸延展性的逐渐提高。但是，最终的抗拉强度仅在Si的1.5重量％以上降低。随着温度的升高，腐蚀电位在酸性溶液中变得更加活跃。在较高的温度下，在慢速应变速率（SSR）条件下，在类似环境中的开裂敏感性提高了，显示出延展性，失效时间和真实失效应力降低。在SSR测试中，施加到试样上的阴极电势在30和60℃导致开裂趋势增强，这表明氢脆是一种可能的破坏机理。在较高的初始应力强度因子下，预裂和楔形加载的双悬臂梁试样的裂纹会增强。通常，具有2.0重量％的Si的钢显示出较差的耐腐蚀性。根据测试的类型，在被测样品中观察到断裂和晶间脆性破坏的组合。

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