Hydrogen embrittlement resistance of pre-strained ultra-high-strength low alloy TRIP-aided steel
| Autor: | Tomohiko Hojo, Akihiko Nagasaka, Ayumi Shiro, Hiroyuki Saitoh, Motomichi Koyama, Eiji Akiyama, Takahisa Shobu, Ryo Yasuda, Bakuya Kumai, Hiroyuki Waki |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Austenite
Materials science Hydrogen Alloy Computational Mechanics chemistry.chemical_element 02 engineering and technology Work hardening engineering.material 01 natural sciences 010101 applied mathematics 020303 mechanical engineering & transports 0203 mechanical engineering chemistry Mechanics of Materials Modeling and Simulation Ferrite (iron) Ultimate tensile strength engineering 0101 mathematics Elongation Composite material Hydrogen embrittlement |
| Zdroj: | International Journal of Fracture. 224:253-260 |
| ISSN: | 1573-2673 0376-9429 |
| DOI: | 10.1007/s10704-020-00451-5 |
| Popis: | In the study, the pre-strain effect on hydrogen embrittlement property of the ultra-high-strength transformation-induced plasticity (TRIP)-aided bainitic ferrite (TBF) steel was investigated towards application for automobile frame parts. Specifically, 3–10% tensile pre-strain suppressed hydrogen-induced mechanical degradation relative to total elongation (pre-strain $$+$$ elongation after hydrogen charging) while 12–15% pre-strained specimen did not exhibit elongation after hydrogen charging. The advantageous effect of the 3–10% pre-strain was attributed to the suppression of crack initiation related to retained austenite. Specifically, the TRIP by pre-straining decreased the volume fraction of retained austenite before hydrogen charging, thereby reducing existing probabilities of preferential crack initiation sites and propagation paths. Conversely, high pre-strain such as 12–15% does not effectively work due to work hardening resulting in increases in hydrogen embrittlement susceptibility and a significant increase in hydrogen content due to the multiplication of dislocations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|