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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of austenitizing conditions on the impact properties of an alloyed austempered ductile iron of initially ferritic matrix structure
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Effect of austenitizing conditions on the impact properties of an alloyed austempered ductile iron of initially ferritic matrix structure

机译：奥氏体化条件对初始铁素体基体组织合金化奥氏体球墨铸铁冲击性能的影响

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摘要

The effect of austenitizing conditions on the microstructure and impact properties of an austempered ductile iron (ADI) containing 1.6% Cu and 1.6% Ni as the main alloying elements was investigated. Impact tests were carried out on samples ofinitially ferritic matrix structure and which had been first austenitized at 850,900,950, and 1000℃ for 15 to 360 mm and austempered at 360℃ for 180 min.Results showed that the austenitizing temperature, T{sub}γ and time, t have a significant effect on the impact properties of the alloy. This has been attributed to the influence of these variables on the carbon kinetics.The impact energy is generally high after short t~ and it falls with further soaking. In samples austenitized at 850 and 900℃, these trends correspond to the gradual disappearance of the pro-eutectoid ferrite and the attainment of fully developedausferritic structures. In initially ferritic structures, the carbon diffusion distances involved during austenitization are large compared to those in pearlitic structures. This explains the relatively long soaking periods required to attain fullyausferritic structures, which in spite of the lower impact energy values, have a better combination of mechanical properties.Microstructures of samples austenitized at 950 and 1000℃ contain no pro-eutectoid ferrite. The impact properties of the former structures are independent of t{sub}γ while those solution treated at 1000℃ are generally low and show wide variation overthe range of soaking time investigated.For fully ausferritic structures, impact properties fall with an increase in T{sub}γ This is particularly evident at 1000℃. As the T{sub}γ increases, the amount of carbon dissolved in the original austenite increases. This slows down the rate ofaustenite transformation and results in coarser structures with lower mechanical properties. Optimum impact properties are obtained following austenitizing between 900 and 950℃ for 120 to 180 mm.
机译：研究了奥氏体化条件对以1.6％Cu和1.6％Ni为主要合金元素的奥氏体球墨铸铁（ADI）的组织和冲击性能的影响。对最初的铁素体基体组织进行了冲击试验，该试样首先在850,900,950和1000℃下奥氏体化15至360 mm，然后在360℃下奥氏体化180 min。结果表明，奥氏体化温度T {sub}γ和时间t对合金的冲击性能有重要影响。这归因于这些变量对碳动力学的影响。短暂的t〜后冲击能量通常很高，并且随着进一步的浸泡而下降。在850和900℃时奥氏体化的样品中，这些趋势对应于前共析铁素体铁氧体的逐渐消失和完全形成的奥氏体铁素体的形成。在初始的铁素体结构中，与珠光体结构相比，奥氏体化过程中涉及的碳扩散距离较大。这解释了获得全铁素体组织所需的相对较长的浸泡时间，尽管冲击能量值较低，但具有更好的机械性能组合。在950和1000℃下奥氏体化的样品的显微组织不含共析铁素体。前者结构的冲击性能与t {sub}γ无关，而在1000℃处理的溶液通常较低，并且在所研究的浸泡时间范围内表现出较大的变化。对于完全奥氏体结构，冲击性能随T { sub}γ在1000℃尤其明显。随着T {sub}γ的增加，原始奥氏体中溶解的碳量增加。这减慢了奥氏体转变的速度，并导致具有较低机械性能的较粗组织。在900至950℃之间奥氏体化120至180毫米后，可获得最佳的冲击性能。

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