The austenite stability and deformation behavior of 15Cr-15Mn-4Ni based austenitic stainless steels alloyed with C or N are studied. Stability of austenite against martensitic transformation was enhanced with increasing C or N content, while N was a more effective element at an equivalent concentration. With the addition of interstitial elements, both yield and tensile strengths increased. The more pronounced effect of N than C on the yield strength was likely to be due to the formation of short range ordering (SRO) and its higher binding energy with dislocations. The strain hardening behavior was described by classifying the deformation regime into two parts. At low strain, short-range obstacle was a main governing factor, while strain-induced martensitic transformation and dislocation interaction controlled the strain hardening at high strain. The difference between C and N on strain hardening at low strain arose from the existence of SRO which induced the formation of planar slip in N containing alloys. On the other hand, the difference in strain hardening behavior at high strain was attributed to the difficulty of SRO recovery in N containing alloys and a larger increase of SFE by N addition in comparison with C.

研究了与C或N合金化的15Cr-15Mn-4Ni基奥氏体不锈钢的奥氏体稳定性和变形行为。随着C或N含量的增加，奥氏体对马氏体相变的稳定性增强，而当量相同时，N是更有效的元素。随着间隙元素的添加，屈服强度和抗拉强度均增加。N对屈服强度的影响比N更明显，这可能是由于形成了短程有序（SRO）及其具有较高位错的结合能。通过将变形状态分为两部分来描述应变硬化行为。在低应变下，短程障碍是主要的控制因素，而应变引起的马氏体转变和位错相互作用控制了高应变下的应变硬化。C和N在低应变下的应变硬化差异，是由于SRO的存在而引起的，这引起了含N合金中平面滑移的形成。另一方面，高应变下的应变硬化行为的差异归因于含氮合金中SRO的回收困难，以及与C相比，添加N导致SFE的增加更大。