In this work, a Ti-modified austenitic stainless steel used in the core of fast reactors is subjected to large strain deformation. The steel is deformed to 200% effective strain through high-temperature torsional loading in temperature domain 1173–1473 K. Three strain rates, namely 0.01 s⁻¹, 0.1 s⁻¹ and 1 s⁻¹, are used for this deformation, so that the combined effect of deformation temperature and strain rate on material response can be studied. The torsional loading conditions are correlated with microstructural mechanisms of work hardening, dynamic recrystallisation (DRX) and post-DRX grain growth, each of which are found to bear a different relation with processing parameters. The microstructural response to this thermo-mechanical treatment is contrasted with the response to a heat treatment that involves equivalent exposure to high temperature. It is found that the steel is amenable to large strain hot deformation, and a variety of microstructures can be generated through control of the hot deformation parameters.

在这项工作中，用于快速反应堆堆芯的Ti改性奥氏体不锈钢经受了较大的变形。该钢是通过高温扭转载荷在温度域变形，以200％的有效应变1173年至1473年K.三应变率，即0.01秒^-1，0.1秒^-1和1秒^-1，用于变形，因此可以研究变形温度和应变速率对材料响应的综合影响。扭转载荷条件与加工硬化，动态再结晶（DRX）和后DRX晶粒长大的微观结构机制相关，发现它们各自与加工参数具有不同的关系。对这种热机械处理的微观结构响应与对涉及等效暴露于高温的热处理的响应形成对比。发现该钢适合大应变热变形，并且通过控制热变形参数可以产生各种微观结构。