Abstract In this study, the effects of carbon concentration and magnetic transition on the austenite lattice parameter of Fe-30Mn-xC alloys were assessed. A linear relationship was obtained between the carbon content and the lattice parameter determined by neutron diffraction and neutron Bragg-edge transmission imaging for austenitic steels bearing 0.007–1.20 mass% C. The results obtained through both methods showed good agreement. In addition, carbon partitioning was evaluated in artificially piled-up discs with different carbon contents in order to develop a new technique for advanced multi-phase steels. The analysis of asymmetry and broadening of the diffraction line profile revealed that the carbon partitioning could be determined. In addition, the Neel temperature was determined by in situ neutron diffraction upon heating and cooling with magnetic diffraction peaks and the change in the lattice parameter with temperature being monitored. The temperature dependence of the austenite lattice parameter was found to become smaller below the Neel temperature. In conclusion, the results presented herein expand the current knowledge on the properties of high Mn austenite.

中文翻译：

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碳浓度和磁转变对30Mn-C钢奥氏体晶格参数的影响

摘要 本研究评估了碳浓度和磁转变对 Fe-30Mn-xC 合金奥氏体晶格参数的影响。对于含 0.007-1.20 质量% C 的奥氏体钢，碳含量与通过中子衍射和中子布拉格边缘透射成像确定的晶格参数之间存在线性关系。通过两种方法获得的结果显示出良好的一致性。此外，还对不同碳含量的人工堆积圆盘中的碳分配进行了评估，以开发一种用于先进多相钢的新技术。衍射线轮廓的不对称性和加宽的分析表明可以确定碳分配。此外，Neel 温度是通过加热和冷却时的原位中子衍射来确定的，其中磁衍射峰和晶格参数随温度的变化被监测。发现奥氏体晶格参数的温度依赖性在尼尔温度以下变得更小。总之，本文中呈现的结果扩展了目前对高锰奥氏体特性的认识。