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Effects of hydrogen absorption on the mechanical and fatigue strength of high-strength bolts for a propulsion motor
- Han, Changwan;
- Doh, Jaehyeok
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0초록
This study examined the effects of hydrogen-related degradation on the static and dynamic fatigue strength of high-strength bolts for propulsion motors during electro-galvanization. Two-bolt types were prepared with different baking treatments: B-0h (no baking) and B-8h (baking at 200 degrees C for 8 h). Baking did not significantly affect the mechanical strength (p < 0.01) but did increase the elongation of B-8h by 25.3 %. In high-cycle fatigue tests, B-8h exhibited a fatigue life of up to 6.3 times longer than that of B-0h. These results indicate that baking effectively mitigates hydrogen-related degradation and enhances the high-cycle fatigue life, ductility, and toughness of electro-galvanized 42CrMo4 steel bolts.
키워드
baking treatment; fatigue strength; fracture surface analysis; high-strength bolt; hydrogen embrittlement; EMBRITTLEMENT; STEELS; ZINC; MICROSTRUCTURE; SUSCEPTIBILITY; RESISTANCE
- 제목
- Effects of hydrogen absorption on the mechanical and fatigue strength of high-strength bolts for a propulsion motor
- 저자
- Han, Changwan; Doh, Jaehyeok
- 발행일
- 2026-01
- 유형
- Article; Early Access