THE TEMPERING OF IRON-CARBON MARTENSITE - DILATOMETRIC AND CALORIMETRIC ANALYSIS
THE TEMPERING OF IRON-CARBON MARTENSITE - DILATOMETRIC AND CALORIMETRIC ANALYSIS
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DOI：
10.1007/bf02645469
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发表时间：
1988-10-01
期刊：
影响因子：
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通讯作者：
MITTEMEIJER, EJ
中科院分区：
文献类型：
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作者：
CHENG, L;BRAKMAN, CM;MITTEMEIJER, EJ
通过定量分析体积和焓的变化，研究了铁碳马氏体（1.13 wt Pct C）在-190 ~ 450℃之间的时效行为。描述了一种通过对试样的某些物理性质进行非等温测量来确定发生的固态转变的活化能的方法。采用纯铁渗碳、盐水和液氮淬火法制备马氏体试样。膨胀和量热实验辅以显微硬度测量。至少可以区分出五个不同的结构变化阶段，并根据它们对体积和焓的影响进行了定量分析：(i)残余奥氏体向马氏体转变（在- 180至- 100°C之间）；（ii）碳原子的再分配（低于100℃）；（iii）过渡碳化物的析出（在80 ~ 200℃之间）；（iv）残余奥氏体的分解（在240 ~ 320℃之间）；(v)过渡碳化物向渗碳体的转变（在260 ~ 350℃之间）。
The aging behavior of iron-carbon martensite (1.13 wt Pct C) between -190 °C and 450 °C was investigated by quantitative analysis of the corresponding changes in volume and enthalpy. A method to determine activation energies of the occurring solid-state transformations by performing non-isothermal measurements of some physical property of the specimen has been described. Martensitic specimens were prepared by carburizing pure iron and quenching in brine and liquid nitrogen. The dilatometric and calorimetric experiments were supplemented with microhardness measurements. At least five different stages of structural change can be distinguished, which are quantitatively analyzed in terms of their effects on volume and enthalpy: (i) transformation of retained austenite into martensite (between −180 and −100 °C); (ii) redistribution of carbon atoms (below 100 °C); (iii) precipitation of transition carbide (between 80 and 200 °C); (iv) decomposition of retained austenite (between 240 and 320 °C); and (v) conversion of transition carbide into cementite (between 260 and 350 °C).