Effect of ageing temperature on the microstructure and localised corrosion of 15–5PH stainless steel

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Corrosion Science Pub Date : 2025-02-18 DOI:10.1016/j.corsci.2025.112800

Alyshia Keogh , Emily Aradi , Mark Taylor , Anthony Cook , Ed Pickering , Zacharie Obadia , Philip Prangnell , Fabio Scenini

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Abstract

The effect of microstructure on the localised corrosion resistance of 15–5PH stainless steel was investigated as a function of ageing temperature (450°C, 540°C and 650°C). Microstructural characterisation revealed an increase in reverted austenite content for samples aged at 650°C. Cu precipitates increased in size with ageing temperature. Cr carbides were observed in samples aged at 540°C, and in samples aged at 650°C with a greater size and number density. Potentiodynamic Polarisation (PDP) and Double-Loop Electrochemical Potentiokinetic Reactivation (DL-EPR) were used to determine the Pitting Potential (E_pit) and the Degree Of Reactivation (DOR) at each ageing temperature, respectively. The scatter in the measured E_pit values was too large to confidently rank pitting susceptibility as a function of ageing temperature. However, it was found that the DOR increased with ageing temperature; this increase correlated with an increase in density of Cr carbides in the microstructure at an ageing temperatures of 540°C and the formation of reverted austenite at 650 °C. These heat treatment induced changes resulted in the distribution of Cr in the microstructure becoming less homogeneous as the ageing temperature increased, leading to a likely increase in the number of susceptible sites for localised corrosion by disruption of the integrity of the passive film.

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时效温度对15-5PH不锈钢组织及局部腐蚀的影响

研究了时效温度（450℃、540℃和650℃）对15-5PH不锈钢局部耐蚀性的影响。显微组织表征表明，在650℃时效时，样品的还原奥氏体含量增加。随着时效温度的升高，Cu析出物的尺寸增大。在540°C时效的样品中观察到Cr碳化物，在650°C时效的样品中观察到Cr碳化物的尺寸和数量密度较大。采用动电位极化法（PDP）和双回路电化学动电位再激活法（DL-EPR）分别测定了各老化温度下的点蚀电位（Epit）和再激活度（DOR）。测量的Epit值的散点太大，无法自信地将点蚀敏感性作为老化温度的函数进行排序。随着老化温度的升高，DOR呈上升趋势；当时效温度为540℃时，微观组织中碳化物的密度增加，650℃时形成了还原奥氏体。随着时效温度的升高，这些热处理引起的变化导致微观组织中Cr的分布变得不均匀，导致钝化膜完整性被破坏，局部腐蚀的易感部位数量可能增加。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.