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首页> 外文会议>2003 International Conference on Powder Metallurgy amp; Particulate Materials; Jun 8-12, 2003; Las Vegas, NV >EFFECT OF POROSITY ON THE MICROSTRUCTURE AND MECHANICAL BEHAVIOR OF POWDER METALLURGY Fe-Mo-Ni STEELS
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EFFECT OF POROSITY ON THE MICROSTRUCTURE AND MECHANICAL BEHAVIOR OF POWDER METALLURGY Fe-Mo-Ni STEELS

机译：孔隙度对粉末冶金Fe-Mo-Ni钢的显微组织和力学行为的影响

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摘要

The microstructure and mechanical properties of Fe-0.85Mo-2Ni-0.6 graphite powder metallurgy (P/M) steels were investigated as a function of sintered density. A quantitative analysis of microstructure was correlated with tensile and fatigue behavior to understand the influence of pore size, shape, and distribution on mechanical behavior. Tensile strength, Young's modulus, strain-to-failure, and fatigue strength all increased with a decrease in porosity. The decrease in Young's modulus with increasing porosity was predicted by analytical modeling. Two-dimensional microstructure-based finite element modeling showed that the enhanced tensile and fatigue behavior of the denser steels could be attributed to smaller, more homogeneous, and more rounded porosity which resulted in more homogeneous deformation and decreased strain localization in the material. The implications of pore size, morphology, and distribution on the mechanical behavior and fracture of P/M steels are discussed.
机译：研究了Fe-0.85Mo-2Ni-0.6石墨粉末冶金（P / M）钢的组织和力学性能随烧结密度的变化。微观结构的定量分析与拉伸和疲劳行为相关，以了解孔径，形状和分布对机械行为的影响。拉伸强度，杨氏模量，断裂应变和疲劳强度均随孔隙率的降低而增加。通过分析模型预测了杨氏模量随孔隙率的增加而降低。基于二维微观结构的有限元建模表明，致密钢的拉伸和疲劳行为增强可归因于较小，更均匀和更圆滑的孔隙率，从而导致材料更均匀的变形和减小的应变局部化。讨论了孔径，形态和分布对P / M钢力学性能和断裂的影响。

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