Effect of molybdenum addition on the mechanical properties of sinter-forged Fe-Cu-C alloys
Effect of molybdenum addition on the mechanical properties of sinter-forged Fe-Cu-C alloys
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DOI：
10.1016/j.jallcom.2015.07.156
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发表时间：
2015-11-15
影响因子：
6.2
通讯作者：
Dabhade, Vikram V.
中科院分区：
文献类型：
--
作者：
Rathore, Sanjay S.;Salve, Milind M.;Dabhade, Vikram V.
钼提供固溶体强化，增强可淬性，因此已被用于显著改善铁合金的机械性能。本文研究了在不同的热处理条件下，添加钼对元素粉末烧结锻造Fe-Cu-C合金性能的影响。将元素粉末混合物在500 MPa的压力下压实，然后在1120 ℃下在N-2- 20%H-2气氛中烧结。此外，在烧结温度下在封闭模具中立即锻造烧结的压坯。烧结锻造压坯进一步均匀化，然后在不同的冷却速率下进行热处理。机械性能（硬度和抗拉强度）的提高，观察与Mo的添加和淬火的严重性的增加。空冷试样的硬度略低于水淬试样，但与油淬试样相当。然而，没有观察到超过1.5wt%的Mo添加的所有冷却条件下的硬度显着增加。在较高的钼含量下，由于钼对铁素体相的稳定，保留了延展性。显微组织研究表明，在炉冷条件下主要是铁素体-珠光体组织，而在快速冷却条件下观察到复杂的显微组织。还观察到钼的加入使晶粒细化。(C)2015 Elsevier B. V.版权所有。
Molybdenum provides solid solution strengthening, enhances hardenability and has thus been used to improve mechanical properties of ferrous alloys significantly. The present study reports the effect of molybdenum addition on the properties of sinter-forged Fe-Cu-C alloys prepared using elemental powders under various heat treatment conditions. The elemental powder mixtures were compacted at a pressure of 500 MPa followed by sintering at 1120 degrees C in N-2-20% H-2 atmosphere. Further, the sintered compacts were immediately forged at the sintering temperature in a closed die. The sinter-forged compacts were further homogenized and then heat treated under different cooling rates. Enhancement of the mechanical properties (hardness and tensile strength) were observed with Mo addition and increase in severity of quench. Hardness of air cooled samples was slightly lower than that of the water quenched samples but comparable with oil quenched samples. However, no significant increase in hardness was observed beyond 1.5 wt% Mo addition for all cooling conditions. At higher molybdenum content ductility was retained due to stabilization of ferrite phase by molybdenum. The microstructural study showed mostly ferrite-pearlite structure in furnace cooled condition whereas a complex microstructure was observed in the faster cooling conditions. Grain refinement was also observed with molybdenum addition. (C) 2015 Elsevier B.V. All rights reserved.