Please click Additional Files below to see the full abstrac

Dadfarnia, Mohsen

Komoda, Ryosuke

Kubota, Masanobu

Sofronis, Petros

Somerday, Brian P.

Takazaki, Daisuke

Tsuchiyama, Toshihiro

English

Engineering Conferences International

EFFECT OF HYDROGEN ON CREEP PROPERTIES OF SUS304 AUSTENITIC STAINLESS STEEL  Masanobu Kubota, International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University kubota.masanobu.304@m.kyushu-u.ac.jp Daisuke Takazaki, Graduate School of Engineering, Kyushu University, (Current: Nippon Steel Co.) Toshihiro Tsuchiyama, Department of Materials Science and Engineering, Kyushu University & WPI-I2CNER Ryosuke Komoda, Department of Engineering, Kyushu Institute of Technology & WPI-I2CNER Brian P. Somerday, Somerday Consulting LLC, University of Illinois at Urbana Champaign & WPI-I2CNER Petros Sofronis, University of Illinois at Urbana Champaign & WPI-I2CNER Mohsen Dadfarnia, Seattle University & WPI-I2CNER   The objective of this study is to gain a better understanding of the degradation of metals in high-temperature hydrogen in order to provide a basic science that enables ensuring the safety of developing high-temperature hydrogen technologies. A creep test was carried out in argon and hydrogen gases under a gas pressure of 0.12 MPa in absolute pressure at 873 K. The material was JIS SUS304 austenitic stainless steel.  The creep rate in hydrogen was significantly increased compared to that in argon. As a result, the creep life in hydrogen was drastically reduced. The saturated hydrogen concentration in the material at 873 K was estimated as 5.3 mass ppm. Regarding the creep fracture surface, creation of dimples was promoted in the hydrogen gas, whereas intergranular cracking was dominant in argon. In contrast to the reduction in creep life (time-to-failure), the creep ductility (strain-to-failure) was increased in hydrogen. Based on the observation of the fracture surface and measurement of the creep ductility, hydrogen enhanced plasticity at 873K.  In order to consider the mechanisms that hydrogen reduced the creep life, the effects of decarburization and carbide formation were investigated. The carbon content didn't change before and after the creep test in hydrogen. In addition, the creep life of the lower carbon SUS304L was reduced in hydrogen similar to the SUS304. These results suggested that the effects of decarburization and carbide formation were minor contributors to the reduced creep life at least within the creep life range of this study.      

Effect of hydrogen on creep properties of SUS304 austenitic stainless steel

https://dc.engconfintl.org/cgi/viewcontent.cgi?filename=0&article=1072&context=hydrogen&type=additional

Effect of hydrogen on creep properties of SUS304 austenitic stainless steel

Abstract

Similar works

Full text

Available Versions

Engineering Conferences International