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首页> 外文期刊>Journal of Materials Engineering and Performance >Influence of Intermetallic Compounds on Age Hardening of Gasoline Pistons in Engine Operations
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Influence of Intermetallic Compounds on Age Hardening of Gasoline Pistons in Engine Operations

机译：金属间化合物对发动机操作中汽油活塞年龄硬化的影响

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Intermetallic precipitates hold the tensile strength of alloy at elevated temperature along with enhanced mechanical and thermal properties. In this research work, we have implemented the new material development of Al-Si alloys with Fe-rich intermetallic precipitates for piston application in order to study the influence of intermetallic compounds (IMCs) on piston performance under engine operations in such a way that pistons with three different intermetallic compositions namely type A, type B and type C were developed to investigate the influence of IMC on age hardening. Three IMC pistons were installed in the engine and allowed to run for six consequent engine operations (1-6 hrs). After the designated hours of engine operation, piston was dismantled from the engine and cut sectioned for aging characterization. Hardness, an indicator of age hardening and thermal stability of the material, was measured at various piston zones such as crown, ring land, top land, skirt and gudgeon pin boss. These hardness values reflect the tendency of age hardening of pistons. It was found that higher IMC density piston alloys (type B and type C) showed the enhancement in tensile strength and hardness about 8 and 13%, respectively. Aging behavior of type B and type C piston zones has been predicted as better due to presence of high dense intermetallic compounds in comparison with type A piston. DSC testing showed that type B and type C have longer precipitation than that of type A piston. Type B and type C alloys have exhibited 20-40% higher specific heat capacity than type A piston. It was found that the high dense star-/Chinese script-like IMC has influenced the Al-Si piston alloy to enhance its properties and piston performance as well.
机译：金属间析出物在高温下保持合金的抗拉强度，同时提高机械和热性能。在这项研究工作中，我们开发了用于活塞应用的含富铁金属间化合物沉淀物的铝硅合金新材料，以研究金属间化合物（IMC）对发动机运行条件下活塞性能的影响，从而使具有三种不同金属间化合物成分的活塞，即a型，开发B型和C型是为了研究IMC对时效硬化的影响。发动机中安装了三个IMC活塞，并允许其连续运行六次（1-6小时）。在指定的发动机运行小时后，从发动机上拆下活塞，并将其剖切以进行老化表征。硬度是材料时效硬化和热稳定性的指标，在不同的活塞区域测量，如活塞顶、活塞环、活塞顶、活塞裙和活塞销凸台。这些硬度值反映了活塞的时效硬化趋势。研究发现，IMC密度较高的活塞合金（B型和C型）的抗拉强度和硬度分别提高了8%和13%。与A型活塞相比，由于高密度金属间化合物的存在，B型和C型活塞区的老化行为被预测为更好。DSC测试表明，B型和C型活塞比A型活塞的沉淀时间更长。B型和C型合金的比热容比A型活塞高20-40%。研究发现，高密度星形/汉字IMC对Al-Si活塞合金产生了影响，从而提高了其性能和活塞性能。

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