The role of delta ferrite in hydrogen embrittlement fracture of 17-4 PH stainless steel

Fan, Yuheng; Zhao, Haili; Weng, Kang Rong; Ma, Cheng; Yang, Hui; Dong, Xianglei; Guo, Can; Li, Y.G.

doi:10.1016/j.ijhydene.2022.07.257

Cited by 11 publications

(3 citation statements)

References 42 publications

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“…Meanwhile, the S content in zone (c) was much lower than that in zone (a). As shown in figure 8, the microstructure of 15CrMo steel in high-pressure hydrogen environment, was mainly dominated by intergranular cracking [42][43][44], which crack size was much smaller than that of hydrogen crack appeared in H 2 /H 2 S environment studied in this paper. Furthermore, S content in the cracking position shown in figure 7 was relatively higher, indicating that the failure of 15CrMo steel was mainly caused by the stress corrosion cracking of H 2 S.…”

Section: Failure Mechanismmentioning

confidence: 63%

Study on failure evolution of 15CrMo steel used for aviation kerosene hydrogenation unit

Liu

Wang

Cui

et al. 2023

Mater. Res. Express

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In aviation kerosene hydrogenation unit, the 15CrMo steel with good resistance to hydrogen embrittlement performed obvious pitting corrosion with certain micro-cracks in H2/H2S environment. In this paper, the failure behavior of 15CrMo steel in H2/H2S environment had been studied using electrochemical method and microscopic morphology. The results showed that within 10 days, the 15CrMo steel performed good resistance with a smaller max pit depth (15.48 μm on the 10th day) in H2/H2S environment, proved by the passivation zone (-0.75~-0.62 V on 10th day). Furthermore, 15CrMo steel exhibited activated corrosion with a significantly increasing max pit depth and corrosion current density, especially, reaching 131.91 μm and 17.29 μA/m2 on 30th day. Moreover, the stress corrosion cracking caused by H2S appeared on 30th day.

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Section: Failure Mechanismmentioning

confidence: 63%

Study on failure evolution of 15CrMo steel used for aviation kerosene hydrogenation unit

Liu

Wang

Cui

et al. 2023

Mater. Res. Express

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“…As seen from Figure 5a, the fracture surface of the uncharged QP980 displays a dimpled morphology, with microvoid coalescence being the dominant mode of fracture. As for the hydrogen-charged sample, quasi-cleavage fracturing, which is a typical HE fracture feature of ferritic [24], martensitic [25] and austenitic steels [26], becomes the dominant fracture mode across the entire fracture surface (Figure 5b). The high-magnification fracture image of hydrogen-charged QP980 (Figure 5c) reveals that flat cleavage facets, whose sizes are smaller than the grain size, are linked by tear ridges (with a bright contrast), which is a typical characteristic of quasi-cleavage fractures.…”

Section: Resultsmentioning

confidence: 99%

Hydrogen Embrittlement Behavior of a Commercial QP980 Steel

Zhao

Zhang

et al. 2023

Metals

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The hydrogen embrittlement (HE) behavior of a commercial QP980 steel is studied in this work. The HE susceptibility results indicate that QP980 suffers from a severe HE, and the fracture mode transforms from ductile dimpling to brittle quasi-cleavage under the attack of hydrogen. The EBSD results show that strain-induced martensite transformation can rarely occur at a strain close to the HE fracture strain, which is mainly attributed to the high mechanical stability of austenite. The TKD-KAM analysis results indicate that hydrogen-induced strain localization in martensite can be mitigated by the hydrogen-trapping effect of surrounding austenite, while it is most pronounced in martensite adjacent to ferrite. Correspondingly, HE cracking is considered to initiate in martensite adjacent to ferrite under the synergistic action of HELP and HEDE mechanisms, and then cracks can propagate through ferrite or along phase interfaces. Our findings suggest that to further improve the HE resistance of QP steel with stable austenite, it is necessary to consider introducing effective hydrogen-trapping sites (such as carbides, film austenite) into martensite, which is deemed to be beneficial for increasing the resistance against hydrogen-induced cracking initiation in martensite.

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“…Fan et al studied the role of δ-Fe of stainless steel in HE [9]. The SKPFM was applied, and the study found that the H preferred to gather at the δ-Fe GBs rather than the austenite GBs, which decreased the fracture risk of austenite GBs.…”

Section: Introductionmentioning

confidence: 99%

First principles study of hydrogen induced the grain boundaries decohesion in fcc Ag

Hu,

Yin,

Liang

2023

J. Phys.: Conf. Ser.

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Hydrogen embrittlement (HE) is a pervasive but harmful physical (chemical) phenomenon, and it has a profound effect on the mechanical properties of metals. Although the study of HE began as early as the near century and a half ago, the essential mechanism of HE still cannot be completely figured out yet. The metallic-H atoms interaction at the atomistic scale is considered the essence of the HE. Especially the interaction of interstitial H and host atoms at grain boundaries is crucial for revealing the HE mechanism. Here, the first principles simulation is applied to study the effect of the trapped H atoms on the grain boundaries (GBs) cleavage behavior. We construct the GBs with different orientations of the face-cantered cubic (fcc) Argentum (Ag) and conduct the ab initio tensile test for all the GBs. The strength of GBs during cleavage, the distortion of GBs structure, and the electronic structure variation induced by trapped H atoms are analyzed. We find the GBs cleavage strength is generally decreased by trapping H atoms at GBs. The decohesion mechanism is the GBs distortion induced by the local electron density variation of the GBs trapping H atoms.

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The role of delta ferrite in hydrogen embrittlement fracture of 17-4 PH stainless steel

Cited by 11 publications

References 42 publications

Study on failure evolution of 15CrMo steel used for aviation kerosene hydrogenation unit

Study on failure evolution of 15CrMo steel used for aviation kerosene hydrogenation unit

Hydrogen Embrittlement Behavior of a Commercial QP980 Steel

First principles study of hydrogen induced the grain boundaries decohesion in fcc Ag

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