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首页> 外文期刊>ISIJ international >Effects of Sintering Conditions on the Mechanical Properties of Metal Injection Molded 316L Stainless Steel
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Effects of Sintering Conditions on the Mechanical Properties of Metal Injection Molded 316L Stainless Steel

机译：烧结条件对316L不锈钢注射成型金属力学性能的影响

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摘要

In this work, tensile and fatigue properties of the metal injection molded 316L stainless steel were studied with the variation of sintering conditions. It was found that increasing sintering temperature and time resulted in a decrease in the porosity along with an increase in the grain size. With decreasing porosity, tensile strength and elongation increased, while yield strength maintained constant, which was attributed to the balanced effects of decrease of porosity and grain coarsening. Tensile strength and elongation were found to be largely dependent on the porosity rather than on the grain size since the fracture occurred mainly by microvoid growth and coalescence. A quantitative analysis on the yield strength was tried by considering the classical Hall-Petch equation and mechanistic models for yield strength of porous materials. The fatigue crack growth resistance at low ΔK level was not largely decreased when the porosity was increased up to 8%, but was significantly decreased when the porosity was increased to 17%. It was discussed in relation to the intrinsic nature of pore morphology and the extrinsic nature of crack closure.
机译：在这项工作中，随着烧结条件的变化，研究了金属注射成型的316L不锈钢的拉伸和疲劳性能。发现增加的烧结温度和时间导致孔隙率降低以及晶粒尺寸增加。随着孔隙率的降低，抗拉强度和伸长率增加，而屈服强度保持恒定，这归因于孔隙率降低和晶粒粗化的平衡作用。由于断裂主要通过微孔生长和聚结而发生，因此发现拉伸强度和伸长率很大程度上取决于孔隙率而不是晶粒尺寸。通过考虑经典的Hall-Petch方程和多孔材料屈服强度的力学模型，对屈服强度进行了定量分析。当孔隙率增加到8％时，在低ΔK值下的抗疲劳裂纹扩展性没有显着降低，但是当孔隙率增加到17％时，抗疲劳裂纹扩展性却显着降低。讨论了有关孔隙形态的内在性质和裂缝闭合的外在性质。

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