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测定了32Mn－7Cr－0．6Mo－0．3N奥氏体钢77K温度下的力学性能、组织稳定性，并研究了其低温变形和断裂行为。结果表明：该钢具有很好的低温强度和韧性以及高的组织稳定性。由于氮原子的影响以及在低温变形过程中产生的滑移带、形变李晶、位错间的相互作用，导致该钢具有较高的加工硬化率和高的均匀延伸率。该钢于77K发生沿（111）历发生穿晶断裂，沿晶断裂被完全抑制。77K断口为韧窝占主导并混有少量准解理小刻面的韧性断裂特征。
The mechanical properties and microstructure stability of 32Mn-7Cr-0.6Mo-0.3N austenitic steel at 77K were measured. The deformation and fracture behavior at low temperature were also studied. The results show that: the steel has good low temperature strength and toughness and high tissue stability. Due to the influence of nitrogen atoms and the interaction of slip band, deformed Li Jing and dislocations generated during the deformation at low temperature, the steel has high work hardening rate and high uniform elongation. The steel undergoes transgranular fracture along (111) at 77K, and the intergranular fracture is completely suppressed. 77K fracture is dominated by dimples and mixed with a small amount of quasi-cleavage facet toughness fracture characteristics.