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首页> 美国政府科技报告 >Fracture: A Novel Technique to Investigate the High Temperature Oxidation of the 20%Cr/25%Ni/Nb Stainless Steel
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Fracture: A Novel Technique to Investigate the High Temperature Oxidation of the 20%Cr/25%Ni/Nb Stainless Steel

机译：断裂：一种研究20％Cr / 25％Ni / Nb不锈钢高温氧化的新工艺

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Simple procedures have been developed for the preparation by fracture of transverse corroded metal sections for subsequent examination of the microstructure and microchemistry of the corrosion attack by scanning electron microscopy. The procedures involved the fabrication of miniature H-shaped tensile specimens from the corroded metal to ensure fracture within a defined location. Tensile fracture was undertaken using a standard vice modified only to clamp the specimens. Examination of 20Cr/25Ni/Nb stainless steel following 120 h oxidation in carbon dioxide at 1000 C confirmed that the essentially three-dimensional picture revealed by fracture provided additional microstructural information not apparent from optical microscopy of standard metallographically mounted sections. The size and morphology of the oxide grains constituting the various layers of the uniform protective and the pitting types of attack were established. Nearest to the underlying steel a band of the inner Cr2O3 layer contained a high but variable silicon concentration and also substantial voidage. Silica intrusions dramatically influenced the mechanical properties of the 20/25/Nb stainless steel to the depth of this intergranular attack, as fracture at 78 K occurred by a brittle mode. Steel unaffected by oxidation, however, continued to remain ductile.

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