Mechanical Properties of Indentation in Plasma Nitrided and Nitrocarburized Austenitic Stainless Steel AISI 321

Q4 Physics and Astronomy
M. D. Manfrinato, Luciana Sgarbi Rossino, A. Kliauga, O. Florêncio
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Abstract

Austenitic stainless steels are widely used due to their resistance to corrosion and to the possibility of using them at temperatures above 600 °C. Plasma nitriding and nitrocarburizing consist of a thermochemical process that introduces nitrogen and nitrogen/carbon, in atomic form, allowing the formation of second phases of these elements with the substrate. These thermochemical treatments of plasma nitriding and nitrocarburizing were performed on austenitic stainless steel AISI 312 at temperatures of 400 °C and 500 °C, obtaining thicknesses of around 12 μm and 24 μm, respectively. Mechanical properties of indentation were obtained using a Hit 300 nanoindenter (Anton Paar), in a load-unload cycle and with a depth of up to 10% of the layer, with Berkovich indenter. The elastic moduli obtained for the nitrided layers were 281 ± 21 GPa (400 °C) and 163 ± 32 GPa (500 °C) and for the nitrocarburized were 214 ± 12 GPa (400 °C) and 169 ± 25 GPa (500 °C). The indentation nanohardness obtained for the nitrided layers were 14.1 ± 1.0 GPa (400 °C) and 3.5 ± 1.2 GPa (500 °C) and for the nitrocarburized layers were 10.8 ± 0.8 GPa (400 °C) and 4.3 ± 1.2 GPa (500 °C). Therefore, these results indicate slightly higher values for the two mechanical properties indentation (elastic modulus and nanohardness) at 400 °C than at 500 °C caused by nitriding compared to nitrocarburizing treatment; however, when considering the percentages of standard deviations, the treatments at 500 °C present much higher values for these properties, as compared to the treatments at 400 °C, a behavior associated with the presence of chromium and iron nitrides.
等离子氮化和渗氮奥氏体不锈钢 AISI 321 的压痕机械特性
奥氏体不锈钢因其耐腐蚀性和可在 600 °C 以上的温度下使用而被广泛使用。等离子渗氮和软氮化是一种热化学过程,它以原子形式引入氮和氮/碳,使这些元素与基体形成第二相。对奥氏体不锈钢 AISI 312 进行了等离子渗氮和软氮化的热化学处理,温度分别为 400 ℃ 和 500 ℃,获得的厚度分别约为 12 μm 和 24 μm。使用 Hit 300 型纳米压头(Anton Paar),在加载-卸载循环过程中,用 Berkovich 压头对钢层进行压痕,压痕深度可达钢层的 10%,从而获得了压痕的机械性能。氮化层的弹性模量为 281 ± 21 GPa(400 °C)和 163 ± 32 GPa(500 °C),氮化层的弹性模量为 214 ± 12 GPa(400 °C)和 169 ± 25 GPa(500 °C)。氮化层的压痕纳米硬度为 14.1 ± 1.0 GPa(400 °C)和 3.5 ± 1.2 GPa(500 °C),软氮化层的压痕纳米硬度为 10.8 ± 0.8 GPa(400 °C)和 4.3 ± 1.2 GPa(500 °C)。因此,这些结果表明,与软氮化处理相比,氮化处理在 400 ℃ 时的两种机械性能压痕值(弹性模量和纳米硬度)略高于 500 ℃ 时的两种机械性能压痕值;但是,如果考虑到标准偏差的百分比,500 ℃ 时的处理与 400 ℃ 时的处理相比,这些性能值要高得多,这与铬和氮化铁的存在有关。
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来源期刊
Defect and Diffusion Forum
Defect and Diffusion Forum Physics and Astronomy-Radiation
CiteScore
1.20
自引率
0.00%
发文量
127
期刊介绍: Defect and Diffusion Forum (formerly Part A of ''''Diffusion and Defect Data'''') is designed for publication of up-to-date scientific research and applied aspects in the area of formation and dissemination of defects in solid materials, including the phenomena of diffusion. In addition to the traditional topic of mass diffusion, the journal is open to papers from the area of heat transfer in solids, liquids and gases, materials and substances. All papers are peer-reviewed and edited. Members of Editorial Boards and Associate Editors are invited to submit papers for publication in “Defect and Diffusion Forum” . Authors retain the right to publish an extended and significantly updated version in another periodical.
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