Simulated effects of martensite start temperature, thermal conductivity and pore content on end quench cooling rate
Simulated effects of martensite start temperature, thermal conductivity and pore content on end quench cooling rate
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DOI：
10.1179/174329008x286712
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发表时间：
2009-12-01
影响因子：
1.4
通讯作者：
Lados, D. A.
中科院分区：
文献类型：
--
作者：
Semel, F. J.;Lados, D. A.
过程建模，基于有限差分法，被用来表明，热传导率的增加，这通常参加在钢中的马氏体相变，影响冷却速率在Jominy端淬试验。一个一维模型，其中包括材料性能变化的影响，提出了预测略有增加的冷却速率与完全致密的钢和粉末冶金（PM）钢的M-S温度的增加和显着增加的速率。该模型是基于早期研究的最终淬火试验，最初显示增加的冷却速率在PM钢与完全致密的，然后继续显示水渗透的孔隙作为一个致病机制。在本研究中，它表明，通过结合一个简单的理论，这种机制与上述的M-S效应，它是可能的，以获得冷却曲线，显示出显着的相似性，这些早期的研究实验观察到的。
Process modelling, based on finite difference methods, is used to show that the thermal conductivity increases, which typically attend the martensite transformation in steel, affect the cooling rate in the Jominy end quench test. A one-dimensional model, which includes the effects of material property variations, is presented that predicts slightly increased cooling rates with increases in the M-s temperature for fully dense steels and significantly increased rates for powder metallurgy (PM) steels. The model is based on earlier studies of the end quench test that initially showed increased cooling rates in PM steels versus fully dense ones and then went on to show water penetration of the pores as a causative mechanism. In the present study, it is shown that by combining a simple theory of this mechanism with the aforementioned M-s effects, it is possible to obtain cooling curves that display a marked resemblance to the experimentally observed ones of these earlier studies.