中文摘要：

介绍了采用深度轧制技术制备的纳米晶304不锈钢板材的力学与腐蚀性能。与普通304不锈钢相比,纳米晶304不锈钢的屈服和抗拉强度同时提高,且延伸率30%以上,拉伸性能提高。相同变幅度条件下,纳米晶304不锈钢应变疲劳的疲劳寿命和疲劳强度同时提高,抗应变疲劳性能提高。在650℃下、Na Cl-Na2SO4混合熔盐和不同浓度盐酸溶液中,纳米晶304不锈钢局部腐蚀阻力提高、腐蚀速度减少并形成致密氧化膜,耐腐蚀性能提高。从纳米晶和普通304不锈钢的价电子结构以及氧化膜电子结构的角度,分析了纳米晶304不锈钢耐腐蚀性能提高的本征因素。

英文摘要：

The mechanical and corrosion properties of nanocrystalline 304 stainless steel（BN-SS304） plate produced by severe rolling technique are introduced in this paper. Compared with conventional polycrystalline 304 stainless steel（CP-SS304） counterparts, the yield and tensile strengths of BN-SS304 are higher than those of CP-SS304 respectively, and the elongation of BN-SS304 is larger than 30%, these results indicate that the tensile properties of BN-SS304 is improved. Under the same strain amplitude, the fatigue life and strength of BN-SS304 were simultaneously enhanced during strain fatigue at room temperature, which means that the strain fatigue resistance of BN-SS304 is improved. In 650 ℃ Na Cl-Na_2SO_4 mixed molten salt and different-concentration HCl solutions, the enhanced localized corrosion resistance, the decrement of corrosion rate and formation of compact oxide film, can demonstrate that the corrosion resistance of BN-SS304 is enhanced at these corrosion cases. In this work, authors understand the intrinsic factors responsible for the enhanced corrosion resistance of BN-SS304 at the angle of its valence electron structures and electronic structures of oxide film.