Effects of vanadium carbides on hydrogen embrittlement of tempered martensitic steel

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• 作者：Junmo Lee ; Taekyung Lee ; Young Jin Kwon ; Dong-Jun Mun…
• 刊名：Metals and Materials International
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：22
• 期：3
• 页码：364-372
• 全文大小：2,587 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Metallic Materials
  Operating Procedures and Materials Treatment
  
• 出版者：The Korean Institute of Metals and Materials, co-published with Springer Netherlands
• ISSN：2005-4149
• 卷排序：22

文摘

Precipitation of V carbides is known to suppress the hydrogen-embrittlement (HE) phenomenon as well as to increase material strength. Despite increasing attention to V carbides, there have been few systematic and quantitative investigations on their effects on HE resistance. This study reveals the role of V carbides on the HE behavior of tempered martensitic steel while eliminating other factors, such as chemical composition of other elements, mechanical strength, and dislocation density. The amount of trapped hydrogen increased with increasing V content, whereas the best HE resistance was attained at 0.2 wt% V and it decreased with further V addition. V carbide was considered as a non-diffusible hydrogen-trapping site in this study. However, excessive V content led to the formation of large undissolved carbides that gave rise to brittle fracture and decreased HE resistance. This study suggests that improved HE resistance can be achieved by minimizing the size and amount of undissolved V carbides.Keywordshydrogenembrittlementprecipitationvanadium carbidetempered martensite