CAJ | 학술논문

为改善纳米材料的高强低塑性，采用温共轧（WCR）和表面机械研磨处理（SMAT）技术，制备出一种具有纳米晶层、亚微米晶层和微米晶层呈交替分布的层状纳米结构（LN）304SS板。研究温轧工艺对LN板力学性能和微观结构的影响。层状纳米结构钢板实现了良好的高强高塑性结合，其屈服强度为700-950MPa，抗拉强度为930-1000MPa，断裂延伸率为30％～50％，且均匀延伸率最高达37％。良好的塑性源于高的加工硬化能力，加工硬化指数竹为0．350，明显高于其它超细晶金属材料。
위개선납미재료적고강저소성，채용온공알（WCR）화표면궤계연마처리（SMAT）기술，제비출일충구유납미정층、아미미정층화미미정층정교체분포적층상납미결구（LN）304SS판。연구온알공예대LN판역학성능화미관결구적영향。층상납미결구강판실현료량호적고강고소성결합，기굴복강도위700-950MPa，항랍강도위930-1000MPa，단렬연신솔위30％～50％，차균균연신솔최고체37％。량호적소성원우고적가공경화능력，가공경화지수죽위0．350，명현고우기타초세정금속재료。
In order to improve the properties of high strength and low ductility of nanostructured metallic materials, a layered and nanostructured (LN) 304 stainless steel sheet characterized by alternate distribution of ultrafine-grained nanocrystalline layer and micro-crystal layer was fabricated by surface mechanical attrition treatment (SMAT) combined with warm co-rolling (WCR). The effects of processing parameters on the mechanical properties of LN sheet were studied. A good combination of high strength and large ductility was achieved in the LN 304 SS. The results of tensile tests revealed that the yield strength was in the range of 700-950 MPa, ultimate strength reached 930 -1 000 MPa,moreover, the elongation to fracture ranged from 30 % to 50%. More importantly, the uniform tensile ductility of LN sheet was high up to 37 %. The strong ductility originated from obvious work hardening ability, where work hardening exponent, n, is high up to 0. 350, much higher than that of the other refined metallic materials.