Direct measurement of carbon enrichment during austenite to ferrite transformation in hypoeutectoid Fe-2Mn-C alloys
Direct measurement of carbon enrichment during austenite to ferrite transformation in hypoeutectoid Fe-2Mn-C alloys
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DOI：
10.1016/j.actamat.2013.02.003
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发表时间：
2013-05
期刊：
影响因子：
9.4
通讯作者：
Zhanwei Liu;G. Miyamoto;Z.G. Yang;T. Furuhara
中科院分区：
文献类型：
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作者：
Zhanwei Liu;G. Miyamoto;Z.G. Yang;T. Furuhara
利用场发射电子探针显微分析技术，研究了在873-998K温度范围内等温转变的Fe-2Mn-(0.05，0.14)C(质量%)合金中未转变奥氏体碳的富集量与转变温度、名义碳含量和原始奥氏体晶粒度的关系。与PE模型相比，PLE/NPLE模型能更好地预测未转变奥氏体碳在无分割生长结束时的富集量。减小原始奥氏体晶粒度可提高碳的富集度。此外，随着转变温度的降低，碳的富集度从PLE/NPLE转变线向T0线转移。这种转变可能归因于溶质阻力效应和/或有限的界面迁移率，两者都随着相变温度的不同而变化。
Carbon enrichment in untransformed austenite at the end of Mn partitionless growth of ferrite for Fe–2Mn–(0.05, 0.14)C (mass%) alloys isothermally transformed in the temperature range 873–998K was measured using field-emission electron probe microanalysis to reveal its dependence on the transformation temperature, nominal carbon content and prior austenite grain size. The PLE/NPLE model gives much better predictions than the PE model for carbon enrichment in untransformed austenite at the end of partitionless growth. Carbon enrichment could be increased by reducing the prior austenite grain size. Furthermore, carbon enrichment shifted from the PLE/NPLE transition line to the T0line on lowering the transformation temperature. This shift is probably attributed to the solute drag effect and/or to the finite interface mobility, both of which vary with the transformation temperature.