Thermal Analysis of the Formation and Dissolution of Cr‐Rich Carbides in Al‐Alloyed Stainless Steels

Thermal Analysis of the Formation and Dissolution of Cr‐Rich Carbides in Al‐Alloyed Stainless Steels
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铝合金不锈钢中富铬碳化物形成和溶解的热分析

DOI:
10.1002/adem.201800658
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发表时间:
2019
影响因子:
3.6
通讯作者:
J. Mola
J. Mola
中科院分区:
材料科学3区
文献类型:
--
作者:
R. Rahimi;O. Volkova;H. Biermann;J. Mola

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采用差示扫描量热法(DSC)和扫描电镜(SEM)研究了Al合金化的Fe-17 Cr-9 Ni-6 Mn-4Al-0. 42 C(质量分数)奥氏体不锈钢中富Cr M7 C3和M23 C6碳化物的形成和溶解过程。在DSC加热过程中以50 K min-1的速率形成M23 C6,导致出现弱放热峰。该峰之后是两个吸热峰,在固态下在较高温度下出现。在1140-1230 °C和1290-1315 °C的温度范围内的峰分别归因于M23 C6和M7 C3碳化物的溶解。还对参比合金的组成改性进行DSC测量。沉淀和溶解反应的过程通过从化学组成中去除Al而保持不变。此外,与参比合金相比,含有较低Cr和C浓度的合金不表现出由于M7 C3碳化物的溶解而导致的吸热峰,表明其在微观结构中不存在。
The formation and dissolution of the Cr‐rich M7C3and M23C6carbides in an Al‐alloyed Fe–17Cr–9Ni–6Mn–4Al–0.42C (mass%) austenitic stainless steel are investigated by differential scanning calorimetry (DSC) measurements and correlative scanning electron microscopy (SEM)‐based examinations. The formation of M23C6during DSC heating at a rate of 50 K min−1results in the occurrence of a weak exothermic peak. This peak is followed by two endothermic peaks appearing at higher temperatures in the solid state. The peaks in the approximate temperature ranges 1140–1230 °C and 1290–1315 °C are attributed to the dissolution of M23C6and M7C3carbides, respectively. DSC measurements are also conducted for compositional modifications of the reference alloy. The course of precipitation and dissolution reactions remains unchanged by the removal of Al from the chemical composition. Furthermore, an alloy containing lower Cr and C concentrations compared to the reference alloy do not exhibit the endothermic peak due to the dissolution of M7C3carbides, indicating its absence in the microstructure.
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