Hydrogen embrittlement properties of nitrogen added ultra-high-strength TRIP-aided martensitic steels evaluated by using conventional strain rate technique

Tomohiko Hojo, Kiattada Chanvichitkul, Hiroyuki Waki, Fumihito Nishimura, Eiji Akiyama

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)

Abstract

Hydrogen embrittlement properties of nitrogen-added TRIP-aided martensitic steels for improving the fuel efficiency of vehicles due to the weight reduction and the impact safety were evaluated by using conventional strain rate tensile tests. Decrease in the total elongation due to hydrogen of a 100-ppm-nitrogen-added TRIP-aided martensitic steel was small in comparison with that of the TRIP-aided martensitic steel without nitrogen. This was attributed to refinement of martensite lath matrix. On the other hand, hydrogen charging decreased the total elongation of a 200-ppm-nitrogen-added TRIP-aided martensitic steel, and decrease in the total elongation of the 200-ppm-nitrogen-added TRIP-aided martensitic steel was more than that of the 100-ppm-nitrogen-added TRIP-aided martensitic steel. This might be caused by the promotion of crack initiation at AlN and AlN/matrix interfaces induced by trapped hydrogen.

Original languageEnglish
Pages (from-to)1581-1587
Number of pages7
JournalProcedia Manufacturing
Volume15
DOIs
Publication statusPublished - 2018
Event17th International Conference on Metal Forming, METAL FORMING 2018 - Toyohashi, Japan
Duration: 2018 Sep 162018 Sep 19

Keywords

  • Conventional strain rate tensile testing
  • High-strength steel
  • Hydrogen embrittlement
  • Nitrogen addition
  • TRIP-aided steel

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Artificial Intelligence

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