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首页> 外文会议>THERMEC 2011;International conference on processing manufacturing of advanced materials >Effect of Liquid Hot Isostatic Pressing on Structure and Mechanical Properties of Aluminum Gravity Die Castings
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Effect of Liquid Hot Isostatic Pressing on Structure and Mechanical Properties of Aluminum Gravity Die Castings

机译：液体热等静压对重力铸铝组织和力学性能的影响

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摘要

Effect of liquid hot isostatic pressing (LHIP) on structure and mechanical properties of an A356.0 alloy was examined. Samples from this alloy were produced by gravity die castings. Part of these samples was subjected to homogenization annealing, and the other part was subjected to LHIP following homogenization annealing. All samples were water quenched from the temperature of prior homogenization annealing or LHIP and finally aged. It was shown that the LHIP processing leads to increase in yield stress, ultimate stress and total elongation. A significant increase in fatigue strength and decreased the scattering of fatigue data takes place too. This is caused by the fact that the fatigue crack initiation mostly occurs on lateral surfaces of the samples subjected to LHIP, whereas shrinkage voids in the non-hipped condition play a major role in crack initiation. In addition, crack propagation under fatigue occurs in samples subjected to LHIP in essentially ductile manner. Thus, LHIP eliminating shrinkage porosity enhances significantly mechanical properties and reliability of aluminum casting.
机译：研究了液体热等静压（LHIP）对A356.0合金的组织和力学性能的影响。通过重力压铸生产这种合金的样品。对这些样品的一部分进行均质退火，然后对另一部分进行均质退火后的LHIP。从先前的均质退火或LHIP的温度对所有样品进行水淬，然后进行时效处理。结果表明，LHIP加工导致屈服应力，极限应力和总伸长率的增加。疲劳强度也显着增加，而疲劳数据的散布也减少了。这是由于以下事实引起的：疲劳裂纹萌生主要发生在经受LHIP的样品的侧面上，而在非翘曲状态下的收缩空隙在裂纹萌生中起主要作用。另外，在经受LHIP的样品中，在疲劳下的裂纹扩展以基本上延展的方式发生。因此，消除收缩孔隙的LHIP可显着提高铝铸件的机械性能和可靠性。

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