Enhancing the hydrogen embrittlement resistance with cementite/VC multiple precipitates in high-strength steel

Shi, Rongjian; Wang, Yanlin; Lu, Supeng; Liu, Saiyu; Tu, Yanqi; Yang, Shani; Gao, Kewei; Yang, Xu Sheng; Pang, Xiaolu

doi:10.1016/j.msea.2023.145084

Cited by 9 publications

(1 citation statement)

References 59 publications

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“…In order to obtain nano-bainite, bainitic steels need to be heated at low temperatures for several hours or even days [ 1 , 2 ]. Distinctively, unlike other high-strength steels [ 3 , 4 ], ultra-fine nano-bainite steels can be fabricated without the need for costly alloying elements, swift heat treatments, or complex machining [ 5 , 6 ], thereby making them a favored option in numerous mechanical industries [ 7 ]. However, the bainite phase transition can be accelerated by optimizing the alloying composition, which includes adding Co and Al elements [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Martensite/Austenite Decomposition during Tempering of Ultrafine Nano-Bainitic Steels

Qu,

Lei,

Chen

et al. 2024

Materials

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In this study, the decomposition of a martensite/austenite (M/A) microconstituent in bainitic steels was analyzed using differential scanning calorimetry (DSC) data in conjunction with Kissinger’s and Johnson–Mehl–Avrami–Kolmogorov (JMAK)’s formulas. In bainitic steel subjected to austempering heat treatment, the presence of an M/A microstructure adversely affects the mechanical properties. According to the kinetic equations derived, it is observed that after tempering the sample at 600 °C for 4000 s, the generation of each phase reaches its maximum. The SEM images taken before and after tempering reveal extensive decomposition of the M/A constituent in the microstructure. The proportion of the M/A microstructure decreased significantly from about 10% before tempering to less than 1% after. Additionally, the content of residual austenite also reduced nearly to zero. These observations are consistent with the predictions of the kinetic equations.

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