The Effect of Different Heat Treatment Procedures on Duplex Stainless Steel Microstructures and Electrochemical Properties

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2020-03-10 DOI:10.22068/IJMSE.17.1.91

M. Azadi, M. Ferdosi, H. Shahin

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引用次数: 2

Abstract

In this paper, the effect of solutioning and various aging heat treatment processes on the microstructure, the hardness and electrochemical properties of a duplex stainless steel (DSS) were studied. The evaluation of the microstructure and phase compositions were carried out by the optical microscopy (OM) and the X-ray diffraction (XRD). Electrochemical behavior of specimens were evaluated by both potentiodynamic polarization and electrochemical impedance spectra (EIS) tests at 25 and 60 oC. The obtained results showed that the solutioning heat treatment increased corrosion rates with respect to the blank specimen. The aging process at 490 oC for 20 hrs increased the volume percent of the carbide phase to the highest value (25.1%) which resulted in an increase in the hardness value up to 170 VHN. The specimen which was aged at 540 oC for 10 h with the Cr7C3 size of 22.8 μm, exhibited the higher corrosion resistance at both temperatures of 25 and 60 oC with respect to other aged specimens. In addition, the temperature of 60 oC promoted the anodic reactions in 3.5 wt.% NaCl solution which decreased impedance modulus values significantly. Consequently, the carbide size was more effective parameter than the carbide content in predicting electrochemical behavior of such alloys.

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不同热处理工艺对双相不锈钢组织和电化学性能的影响

研究了固溶和不同时效热处理工艺对双相不锈钢(DSS)显微组织、硬度和电化学性能的影响。利用光学显微镜(OM)和x射线衍射仪(XRD)对材料的微观结构和相组成进行了表征。在25℃和60℃条件下，通过动电位极化和电化学阻抗谱(EIS)测试来评价样品的电化学行为。结果表明，固溶热处理相对于空白试样提高了腐蚀速率。在490℃时效20 h后，碳化物相的体积百分比达到最大值(25.1%)，硬度值提高到170 VHN。在540℃时效10 h, Cr7C3尺寸为22.8 μm的试样，在25℃和60℃时的耐蚀性均高于其他时效试样。此外，在3.5% wt.% NaCl溶液中，60℃的温度促进了阳极反应，显著降低了阻抗模量。因此，碳化物尺寸比碳化物含量更能有效地预测合金的电化学行为。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.