<P><B>Abstract</B></P> <P>The hydrogen embrittlement (HE) and H trapping sites of pearlitic steel specimens with various lamellar spacings (λ) were evaluated through slow strain rate tensile testing and thermal de...
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https://www.riss.kr/link?id=A107703934
2019
-
SCOPUS,SCIE
학술저널
92-101(10쪽)
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
<P><B>Abstract</B></P> <P>The hydrogen embrittlement (HE) and H trapping sites of pearlitic steel specimens with various lamellar spacings (λ) were evaluated through slow strain rate tensile testing and thermal de...
<P><B>Abstract</B></P> <P>The hydrogen embrittlement (HE) and H trapping sites of pearlitic steel specimens with various lamellar spacings (λ) were evaluated through slow strain rate tensile testing and thermal desorption analysis. When λ decreases, both tensile strength and resistance to HE were unusually improved. This is because tearing, which is the initiation of H cracking, was delayed in the specimen with fine λ and short cementite (θ) platelets. Undeformed H-charged specimens showed a peak (peak 1), which is separable into two sub-peaks (peak 1-1 and peak 1–2) in their H desorption rate curves, regardless of λ. Peak 1-1 and peak 1–2 were generated by H atoms detrapped from F<SUB>P</SUB>/θ interfaces and from dislocations inside F<SUB>P</SUB>, respectively. The <I>E</I> <SUB> <I>a</I> </SUB> values of H desorption for peak 1-1 and peak 1–2 were 23.2 kJ/mol, and 26.1 kJ/mol, respectively. Meanwhile, deformed H-charged specimens exhibited the second peak (peak 2) with peak temperature (T<SUB>P</SUB>) of ∼600 K, as well as peak 1 with T<SUB>P</SUB> of ∼375 K. When tensile strain increased, peak 2 increased at the expense of peak 1. Primary H trapping sites for peak 2 are strained F<SUB>P</SUB>/θ interfaces with interfacial dislocations.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>