Effects of tantalum on austenitic transformation kinetics of RAFM steel

IF 3.1 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Iron and Steel Research(International) Pub Date : 2017-07-01 DOI:10.1016/S1006-706X(17)30106-1
Jian-guo Chen, Yong-chang Liu, Chen-xi Liu, Bi-yu Yan, Hui-jun Li
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引用次数: 17

Abstract

The RAFM (reduced activation ferritic/martensitic) steels containing different tantalum contents (0 wt. %, 0. 027 wt. %, 0. 073 wt. %) were designed and cast. Differential scanning calorimetry and optical microscopy were employed to explore the influence of tantalum content on the austenitic transformation of RAFM steels. The austenitic transformation kinetics was described by a phase-transformation model. The model, involving site saturation nucleation, diffusion-controlled growth and impingement correction, was established based on the classical Johnson-Mehl-Avrami-Kolmogorov model. The phase-transformation kinetics parameters, including D0 (pre-exponential factor for diffusion) and Qd (activation energy for diffusion), were calculated by fitting the experimental data and the kinetic model. The results indicated that the average grain size is decreased with the increase of tantalum. The values of Ac1 and Ac3 (onset and finish temperature of austenitic transformation, respectively) are increased by increasing the tantalum content. The increase of tantalum caused the decrease of D0. However, Qd is increased with the increase of tantalum. In addition, as a carbides forming element, tantalum would reduce the carbon diffusion coefficient and slow down the austenitic transformation rate.

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钽对RAFM钢奥氏体转变动力学的影响
含不同钽含量(0 wt. %、0 wt. %、0 wt. %)的还原活化铁素体/马氏体钢。027 wt. %, 0。0.073 wt. %)设计并铸造。采用差示扫描量热法和光学显微镜研究了钽含量对RAFM钢奥氏体转变的影响。奥氏体相变动力学用相变模型来描述。基于经典的Johnson-Mehl-Avrami-Kolmogorov模型,建立了包含位置饱和成核、扩散控制生长和冲击校正的模型。通过拟合实验数据和动力学模型,计算了相变动力学参数D0(扩散指前因子)和Qd(扩散活化能)。结果表明,随着钽用量的增加,平均晶粒尺寸减小。随着钽含量的增加,Ac1和Ac3(奥氏体相变开始温度和结束温度)升高。钽的增加导致D0的降低。而量子点随钽含量的增加而增加。此外,作为碳化物形成元素,钽会降低碳扩散系数,减缓奥氏体相变速率。
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来源期刊
CiteScore
4.30
自引率
0.00%
发文量
2879
审稿时长
3.0 months
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