Effect of hydrogen and strain rate on nanoindentation creep of austenitic stainless steel. (8th January 2019)

• Record Type: Journal Article
• Authors: Hong, Yuanjian; Zhou, Chengshuang; Zheng, Yuanyuan; Zhang, Lin; Zheng, Jinyang; Chen, Xingyang
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 2(2019)
• Page Start: 1253
• Page End: 1262
• Publication Date: 2019-01-08
• Subjects: Hydrogen -- Stainless steel -- Nanoindentation creep -- Strain rate -- α′ martensite; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2018.11.017
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The effect of hydrogen and strain rate on nanoindentation creep of austenitic stainless steel was investigated by nanoindentation loading and creep tests. The loading segment mainly reflects dislocation nucleation, but creep mainly indicates dislocation movement. The strain rate significantly influences dislocation nucleation, resulting in increased creep displacement with strain rate. The interaction between hydrogen and dislocation is responsible for the increased creep displacement in 310S steel. Hydrogen greatly enhances the displacement burst after small strain rate due to increased dislocation nucleation rate. Hydrogen slightly enhances creep of 304 steel as hydrogen diffuses through strain-induced α′ martensite to accumulate under the indenter before creep and enhances dislocation movement. Highlights: Displacement burst occurs at small loading strain rate due to low dislocation nucleation rate in 310S steel. Hydrogen greatly enhances the displacement due to increased dislocation nucleation rate in 310S steel. Hydrogen enhances creep of 304 steel slightly.