Influence of Martensite Fraction on the Stabilization of Austenite in Austenitic–Martensitic Stainless Steels
Influence of Martensite Fraction on the Stabilization of Austenite in Austenitic–Martensitic Stainless Steels
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DOI：
10.1007/s11661-016-3382-1
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发表时间：
2016-02
期刊：
影响因子：
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通讯作者：
Qiuliang Huang;B. C. Cooman;H. Biermann;J. Mola
中科院分区：
文献类型：
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作者：
Qiuliang Huang;B. C. Cooman;H. Biermann;J. Mola
本文通过Fe-13 Cr-0.31C（质量百分数）不锈钢在低于室温下的淬火中断，研究了马氏体分数（fα′）对奥氏体稳定化的影响。淬火中断温度和二次马氏体开始温度之间的间隔（表示为θ）用于量化奥氏体稳定化的程度。在淬火中断后有和没有再加热步骤的实验中，θ随f α '的变化表明，几乎一半的奥氏体发生转变后，θ随f α'的变化出现转变。无论影响马氏体起始温度的固溶退火温度如何，都观察到这种趋势。θ的转变归因于马氏体形核点的类型从低α′时的奥氏体晶界和孪晶晶界转变为高α′时的马氏体-马氏体（A-M）晶界附近的缺陷。在低温下，这种边界的局部碳富集是在高f α′下增强稳定性的原因。另一方面，在与淬火和分配处理相关的高温下，在高f α′处的显著稳定归因于储存在A-M边界处的碳均匀分配到奥氏体中。在高温下，奥氏体的缺陷密度的减少作为一种辅助稳定机制。
The influence of martensite fraction (fα′) on the stabilization of austenite was studied by quench interruption belowMstemperature of an Fe-13Cr-0.31C (mass pct) stainless steel. The interval between the quench interruption temperature and the secondary martensite start temperature, denoted asθ, was used to quantify the extent of austenite stabilization. In experiments with and without a reheating step subsequent to quench interruption, the variation ofθwithfα′showed a transition after transformation of almost half of the austenite. This trend was observed regardless of the solution annealing temperature which influenced the martensite start temperature. The transition inθwas ascribed to a change in the type of martensite nucleation sites from austenite grain and twin boundaries at lowfα′to the faults near austenite–martensite (A–M) boundaries at highfα′. At low temperatures, the local carbon enrichment of such boundaries was responsible for the enhanced stabilization at highfα′. At high temperatures, relevant to the quenching and partitioning processing, on the other hand, the pronounced stabilization at highfα′was attributed to the uniform partitioning of the carbon stored at A–M boundaries into the austenite. Reduction in the fault density of austenite served as an auxiliary stabilization mechanism at high temperatures.