Abstract Encapsulated microstructures of austenite and co-precipitates were formed using a designed tempering and double partitioning (TDP) heat treatment based on the precipitation-induced localized austenite reversion in a medium manganese (Mn) steel. The retained austenite in TDP steel showed better mechanical stability due to the preferable coherency of austenite/ferrite interfaces and a greater capability of geometrically necessary dislocations (GNDs) accommodation. The outstanding cryogenic tensile mechanical properties were attributed to the heterogeneous capsule structure of the austenite in the TDP steel, in which the e-martensite transformation has been suppressed and the austenite were segmented by the α’-martensite during deformation.

中文翻译：

---

含包封奥氏体的中锰钢的机械响应

摘要 基于中锰 (Mn) 钢中析出引起的局部奥氏体回复，使用设计的回火双分配 (TDP) 热处理形成奥氏体和共沉淀物的包封显微组织。由于奥氏体/铁素体界面的优选相干性和更大的几何必要位错 (GNDs) 适应能力，TDP 钢中的残余奥氏体显示出更好的机械稳定性。出色的低温拉伸力学性能归因于 TDP 钢中奥氏体的异质胶囊结构，其中 e-马氏体转变受到抑制，奥氏体在变形过程中被 α'-马氏体分割。