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首页> 外文期刊>Metallurgical and Materials Transactions A >Influence of Thermal Aging on the Microstructure and Mechanical Behavior of Dual-Phase, Precipitation-Hardened, Powder Metallurgy Stainless Steels
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Influence of Thermal Aging on the Microstructure and Mechanical Behavior of Dual-Phase, Precipitation-Hardened, Powder Metallurgy Stainless Steels

机译：热时效对双相，沉淀强化粉末冶金不锈钢的组织和力学行为的影响

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摘要

The effects of thermal aging on the microstructure and mechanical behavior of dual-phase, precipitation-hardened, powder metallurgy (PM) stainless steels of varying ferrite–martensite content were examined. Quantitative analyses of the inherent porosity and phase fractions were conducted on the steels, and no significant differences were noted with respect to aging temperature. Tensile strength, yield strength, and elongation to fracture all increased with increasing aging temperature reaching maxima at 811 K (538 °C) in most cases. Increased strength and decreased ductility were observed in steels of higher martensite content. Nanoindentation of the individual microconstituents was employed to obtain a fundamental understanding of the strengthening contributions. Both the ferrite and martensite nanohardness values increased with aging temperature and exhibited similar maxima to the bulk tensile properties.
机译：研究了热时效对铁素体-马氏体含量不同的双相，沉淀硬化粉末冶金（PM）不锈钢的显微组织和力学行为的影响。对这些钢的固有孔隙率和相分数进行了定量分析，并且在时效温度方面未发现明显差异。在大多数情况下，拉伸强度，屈服强度和断裂伸长率都随着时效温度的升高而增加，达到811 K（538°C）的最大值。在较高马氏体含量的钢中观察到强度增加和延展性降低。使用单个微成分的纳米压痕获得对增强作用的基本了解。铁素体和马氏体的纳米硬度值都随着时效温度的增加而增加，并且表现出与整体拉伸性能相似的最大值。

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