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Elevated temperature mechanical properties and corrosion characteristics evaluation of alloy HT-9.

机译：HT-9合金的高温力学性能和腐蚀特性评估。

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This thesis presents the results of tensile testing, stress corrosion cracking (SCC) and localized corrosion studies of Alloy HT-9, which is currently being considered as a target structural material for transmutation applications. The results of tensile testing indicate that the yield strength and the ultimate tensile strength were gradually reduced with increasing temperature, but the ductility parameters were enhanced due to increased plastic deformation, irrespective of the tempering time. The results of SCC testing in the 90°C acidic solution, performed by the slow-strain-rate (SSR) technique, revealed higher failure stress (sigmaf) at longer tempering time. Localized corrosion studies conducted by polarization technique showed pitting and crevice corrosion in specimens exposed to both neutral and acidic environments. The fractographic evaluations of the primary fracture face of the broken tensile specimen by scanning electron microscopy revealed dimpled microstructure indicating ductile failure. Branched secondary cracks were observed along the gage length of the SCC test specimens, evaluated by optical microscopy.

机译：本文介绍了HT-9合金的拉伸试验，应力腐蚀开裂（SCC）和局部腐蚀研究的结果，该合金目前被认为是as变应用的目标结构材料。拉伸试验的结果表明，随温度升高，屈服强度和极限抗拉强度逐渐降低，但由于塑性变形增加，延展性参数得以提高，而与回火时间无关。通过慢应变速率（SSR）技术在90°C酸性溶液中进行SCC测试的结果表明，在较长的回火时间下，较高的破坏应力（sigmaf）。通过极化技术进行的局部腐蚀研究表明，暴露于中性和酸性环境的样品均出现点蚀和缝隙腐蚀。通过扫描电子显微镜对断裂的拉伸试样的主断裂面进行的形貌评价表明，微观结构凹陷，表明韧性破坏。沿SCC测试样品的标距长度观察到分支的次要裂纹，通过光学显微镜评估。

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作者
Yarlagadda, Bhagath.;
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作者单位

University of Nevada, Las Vegas.;

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授予单位 University of Nevada, Las Vegas.;
学科 Engineering Mechanical.; Engineering Materials Science.
学位 M.S.
年度 2004
页码 73 p.
总页数 73
原文格式 PDF
正文语种 eng
中图分类机械、仪表工业;工程材料学;
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Elevated temperature mechanical properties and corrosion characteristics evaluation of alloy HT-9.

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