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首页> 美国卫生研究院文献>Materials >Microstructure Mechanical and Corrosion Properties of Ni-Free Austenitic Stainless Steel Prepared by Mechanical Alloying and HIPping
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Microstructure Mechanical and Corrosion Properties of Ni-Free Austenitic Stainless Steel Prepared by Mechanical Alloying and HIPping

机译：机械合金化和HIPping法制备的无镍奥氏体不锈钢的组织力学和腐蚀性能

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摘要

An influence of the powder metallurgy route on the phase structure, mechanical properties, and corrosion resistance of Fe–18%Cr–12%Mn–N nickel-free austenitic stainless steel as a potential material for medical applications were studied. The powder was mechanically alloyed in a high purity nitrogen atmosphere for 90 h followed by Hot Isostatic Pressing at 1150 °C (1423 K) and heat treatment at 1175 °C (1423 K) for 1 h in a vacuum with furnace cooling and water quenching. More than 96% of theoretical density was obtained for the samples after Hot Isostatic Pressing that had a direct influence on the tensile strength of the tested samples (Ultimate Tensile Strength is 935 MPa) with the total elongation of 0.5%. Heat treatment did not affect the tensile strength of the tested material, however, an elongation was improved by up to 3.5%. Corrosion properties of the tested austenitic stainless steel in various stages of the manufacturing process were evaluated applying the anodic polarization measurements and compared with the austenitic 316LV stainless steel. In general, the heat treatment applied after Hot Isostatic Pressing improved the corrosion resistance. The Hot Isostatic Pressing sample shows dissolution, while heat treatment causes a passivity range, the noblest corrosion potential, and lower current density of this sample.
机译：研究了粉末冶金路线对作为医学应用潜在材料的无Fe-18％Cr-12％Mn-N无镍奥氏体不锈钢的相结构，力学性能和耐蚀性的影响。将粉末在高纯度氮气气氛中机械合金化90小时，然后在1150°C（1423 K）的热等静压中，在真空中在1175°C（1423 K）的热处理中进行1 h，并进行炉冷和水淬。热等静压后样品的理论密度超过96％，这直接影响了测试样品的拉伸强度（最终拉伸强度为935 MPa），总伸长率为0.5％。热处理不会影响被测材料的拉伸强度，但是，伸长率提高了多达3.5％。使用阳极极化测量评估了测试的奥氏体不锈钢在制造过程各个阶段的腐蚀性能，并与奥氏体316LV不锈钢进行了比较。通常，热等静压后进行的热处理可提高耐腐蚀性。热等静压样品显示溶解，而热处理会导致该样品的钝化范围，最高的腐蚀电位和较低的电流密度。

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