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首页> 外文会议>Annual Meeting Exhibition of The Minerals, Metals Materials Society >The Validity of Additivity Rule for Pearlite Transformation in Eutectoid Steels
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The Validity of Additivity Rule for Pearlite Transformation in Eutectoid Steels

机译：eutectoid钢中珠光体转化添加剂规则的有效性

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The additivity rule has been widely used to predict the phase transformation behavior during continuous cooling (CCT) from the experimental isothermal phase transformation data (TTT). The calculated result of the additivity rule is the time (t_(CCT)) which satisfies the summation of Δt/t_(TTT) equals unity under a specific continuous cooling rate. The t_(TTT) represents the time required to obtain the fraction X at temperature (t_(TTT))> which is usually fitted by Johnson-Mehl-Avrami (JMA) equation. Since the TTT experiment can be performed only in a limited temperature range, we realize the formula of t_(TTT) between equilibrium and the maximum measured temperature significantly affects t_(CCT- In this study, a proper formula of t_(TTT)(X, T) is suggested by considering nucleation and growth mechanism of pearlite transformation. The parameter indicates that the extrapolation effect (α_(ex)) is defined. The allowable cooling rate range with α_(ex) ≤ 0.1 is proposed based on the isothermal tested temperature range of Reti et al. (J Mater Eng Perfom 6:433-441 [1]). It is confirmed that allowable cooling rate range is enlarged by increasing isothermal tested temperature range to verify the validity of additivity rule. The additional isothermal test temperature is calculated which shows T~(Add)_(TTT) = 679.2 °C for eutectoid steel to determine additivity rule.
机译：的加性规则已被广泛用于预测从实验等温相变数据（TTT）连续冷却（CCT）中的相变行为。的加性规则的计算结果是时间（T_（CCT）），其满足ΔT/ T_（TTT）的总和的特定连续冷却速率下等于正常值。所述T_（TTT）表示，以获得在该温度下的分数X（T_（TTT））>其通常由Johnson-Mehl的-阿夫拉米（JMA）方程拟合所需的时间。由于TTT实验只能在有限的温度范围内进行，我们认识T_（TTT）的平衡和最大测量温度之间的式显著影响T_（CCT-在这项研究中，T_（TTT的适当式）（X ，T）是通过考虑成核和珠光体相变的生长机理提出，该参数表明外推的效果（α_（前））中定义。该允许的冷却速率范围与α_（前）≤0.1是基于测试的等温提出温度范围内的列蒂等人（J母校主机Perfom 6：433-441 [1]）。据证实，容许冷却速率范围是通过增加测试等温的温度范围内，以验证加性规则的有效性增大该附加的等温试验温度被计算，其示出了T〜（ADD）_（TTT）= 679.2℃，共析钢，以确定加性规则。

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