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Acta Metall Sin  2015, Vol. 51 Issue (11): 1315-1324    DOI: 10.11900/0412.1961.2015.00033
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STUDY ON HYDROGEN EMBRITTLEMENT SUSCEPTIBILITY OF 1000 MPa GRADE 0Cr16Ni5Mo STEEL
Yongwei SUN1,Jizhi CHEN1,2(),Jun LIU2
1 College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001
2 Luoyang Ship Material Research Institute, Luoyang 471000
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Abstract  

0Cr16Ni5Mo steel is the most popular material used for fasteners and bolts in the marine engineering equipment. With the light weight trend of equipment, the strength grades of the steel become higher. 0Cr16Ni5Mo steel combines high strength, high hardness and high fracture toughness with good ductility. However, high strength steel is prone to degradation by hydrogen, resulting in the loss of its excellent mechanical properties. And the presence of diffusible hydrogen near a notch tip is easily to cause crack propagation. The susceptibility to hydrogen embrittlement of steel is largely determined by the hydrogen diffusivity and the behaviors of hydrogen trapping in the steel. Therefore, the hydrogen trapping behaviors of 1000 MPa grade 0Cr16Ni5Mo steel have been investigated by means of thermal desorption spectroscopy (TDS). Meanwhile, the hydrogen embrittlement susceptibility of the notch and smooth specimens was evaluated by slow strain rate tests (SSRT), and the fracture morphology was also observed. The results showed that the main hydrogen traps of experimental steel was contained dislocations and grain boundaries. The elongation of hydrogen charged specimens was decreased obviously rather than tensile strength. With the increase in hydrogen concentration, the fracture surfaces of hydrogen charged specimens was displayed a transition from ductile microvoid coalescence to a mixed morphology of dimples, quasi-cleavage and intergranular features. The steel had little irreversible hydrogen due to less C content, and had much susceptibility with reversible hydrogen contained. The model of hydrogen induced stress was calculated on basis of Eshelby equivalent inclusion, validating the relationship between stress concentration and hydrogen concentration.

Key words:  0Cr16Ni5Mo steel      hydrogen embrittlement      hydrogen trapping      Eshelby equivalent inclusion     

Cite this article: 

Yongwei SUN,Jizhi CHEN,Jun LIU. STUDY ON HYDROGEN EMBRITTLEMENT SUSCEPTIBILITY OF 1000 MPa GRADE 0Cr16Ni5Mo STEEL. Acta Metall Sin, 2015, 51(11): 1315-1324.

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00033     OR     https://www.ams.org.cn/EN/Y2015/V51/I11/1315

Fig.1  Schematics of shape and dimension of slow strain rate test (SSRT) specimens (unit: mm)

(a) notched specimen (b) smooth specimen

Fig.2  OM image (a) and TEM image (b) of 0Cr16Ni5Mo steel after quenching and tempering at 793.15 K
Fig.3  Thermal desorption spectroscopy (TDS) curves (a) of 0Cr16Ni5Mo steel and data fitting (b) (Φ—heating rate, Tp—peak temperature, r—correlation coefficient)
Fig.4  SSRT curves of notched specimens of 0Cr16Ni5Mo steel with different hydrogen concentration (CH) at room temperature (RT)
Fig.5  Low (a, c, e) and high (b, d, f) magnified SEM images of fracture surface in the notched specimens of 0Cr16Ni5Mo steel with different CH after SSRT

(a, b) hydrogen uncharged (c, d) CH=5.4×10-6 (e, f) CH=6.6×10-6

Fig.6  SSRT curves of smooth specimens of 0Cr16Ni5Mo steel with different CH at RT
Fig.7  Relationships of reduction of area vs CH (a) and elongation vs CH (b) of smooth specimens of 0Cr16Ni5Mo steel at RT
Fig.8  Low (a, c, e) and high (b, d, f) magnified SEM images of fracture surface in the smooth specimens of 0Cr16Ni5Mo steel with different CH after SSRT

(a, b) hydrogen uncharged (c, d) CH=5.2×10-6 (e, f) CH=9.5×10-6

Fig.9  Schematics of Eshelby model (W—a volume element, C0—hydrogen concentration in the initial state, C—hydrogen concentration in the current state, eH—unconstrained dilatation strain)
Fig.10  Variation of the hydrogen induced stress concentration (sn) vs hydrogen concentration (C0) of notched specimen without constraint
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