不同变形量对0Cr21Ni6Mn9N不锈钢力学性能的影响

研究了不同变形量对不同氮含量的OCr21Ni6Mn9N不锈钢力学性能的影响。结果表明，不同氮含量的0Cr21Ni6MngN不锈钢都具有很强的加工硬化特性，冷变形使强度和硬度得到大幅度提高，但塑性会有所降低。氮的质量分数为0．20％～0．48％的0Cr21Ni6MngN不锈钢，控制变形量在20％以下，屈服强度可达到745MPa以上，同时保持伸长率在25％以上。分析表明，不同变形后钢的屈服强度与产生同等变形量的真应力具有很好的对应关系，且两者随变形量的变化规律基本相同。该钢的加工硬化行为明显分为两种情况，应变水平低于约20％时，强度提高幅度很大，而应变水平高于约20％后，强度提高幅度相对较小了，其原因是变形机制不同。

Effect of Cold Deformation on Mechanical Properties of 0Cr21Ni6Mn9N Stainless Steel

The influence of cold deformation on mechanical properties of 0Cr21Ni6Mn9N stainless steel with different nitrogen contents was studied.The results show that the stainless steels 0Cr21Ni6Mn9N with different N content have strong work hardening characteristics and cold deformation can enhance the strength and hardness significantly,whereas the ductility of the steel is decreased.With respect to the 0Cr21Ni6Mn9N stainless steel containing(0.20%~)0.48%N,when deformation is controlled below 20%,the yield strength can reach 745 MPa and above,while(elongation) can be maintained 25% and above.The variation of yield strength with deformation is corresponding with Ludwigson model,the yield strength of the steel after different deformation is corresponding to the true stress for yielding equal strain very well.Both of them change with deformation in similar way.There are two kinds of work-hardening of the steel: when strain is lower than about 20%,the enhancement of strength is quite great,whereas,when strain is higher than about 20%,the enhancement of strength is smaller because of different deforming mechanism.