Cracking of Martensitic Alloy EP-823 Under Controlled Potential

Roy, Ajit K.; Hossain, Mohammad K.

doi:10.1361/105994906x108648

Cited by 8 publications

(1 citation statement)

References 9 publications

(4 reference statements)

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“…on mechanical properties of ferritic/martensitic steels were studied by different researchers. It was reported that the addition of silicon can improve the oxidation resistance [25,26], the liquid metal corrosion resistance [27,28] of 9%-12%Cr ferritic/martensitic steels. However, on the mechanical properties, silicon has two conflicting effects.…”

Section: Introductionmentioning

confidence: 99%

Effects of Silicon Content and Tempering Temperature on the Microstructural Evolution and Mechanical Properties of HT-9 Steels

Liu

Hao

et al. 2020

Materials

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Two kinds of experimental ferritic/martensitic steels (HT-9) with different Si contents were designed for the fourth-generation advanced nuclear reactor cladding material. The effects of Si content and tempering temperature on microstructural evolution and mechanical properties of these HT-9 steel were studied. The microstructure of experimental steels after quenching and tempering were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM); the mechanical properties were investigated by means of tensile test, Charpy impact test, and hardness test. The microscopic mechanism of how the microstructural evolution influences mechanical properties was also discussed. Both XRD and TEM results showed that no residual austenite was detected after heat treatment. The results of mechanical tests showed that the yield strength, tensile strength, and plasticity of the experimental steels with 0.42% (% in mass) Si are higher than that with 0.19% Si, whereas hardness and toughness did not change much; when tempered at 760 °C, the strength and hardness of the experimental steels decreased slightly compared with those tempered at 710 °C, whereas plasticity and toughness increased. Further analysis showed that after quenching at 1050 °C for 1 h and tempering at 760 °C for 1.5 h, the comprehensive mechanical properties of the 0.42% Si experimental steel are the best compared with other experimental steels.

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Section: Introductionmentioning

confidence: 99%

Effects of Silicon Content and Tempering Temperature on the Microstructural Evolution and Mechanical Properties of HT-9 Steels

Liu

Hao

et al. 2020

Materials

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The Role of Silicon Content on Environmental Degradations of T91 Steels

Roy

Maitra

Kumar

2008

J. of Materi Eng and Perform

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T91 grade steels showed a gradual enhancement in tensile ductility at ambient temperature due to an increase in Si content from 0.5 to 2.0 weight percent (wt.%). However, the ultimate tensile strength was reduced only above 1.5 wt.% Si. The corrosion potential became more active in an acidic solution with increasing temperature. The cracking susceptibility in a similar environment under a slow-strain-rate (SSR) condition was enhanced at higher temperatures showing reduced ductility, time to failure, and true failure stress. Cathodic potentials applied to the test specimens in SSR testing caused an enhanced cracking tendency at 30 and 60°C, suggesting hydrogen embrittlement as a possible mechanism of failure. Cracking of precracked and wedge-loaded double-cantilever-beam specimens was enhanced at higher initial stress intensity factors. In general, steels with 2.0 wt.% Si showed inferior corrosion resistance. A combination of cleavage and intergranular brittle failure was seen in the tested specimens depending on the type of testing.

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The Effect of Silicon Content on Impact Toughness of T91 Grade Steels

Roy

Kumar

Maitra

2008

J. of Materi Eng and Perform

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The impact resistance of silicon (Si)-containing modified 9Cr-1Mo steels has been investigated within a temperature regime of 240 to 440°C using the Charpy method. The results indicate that the energies absorbed in fracturing the tested specimens were substantially lower at temperatures of 240, 25, and 75°C compared to those at elevated temperatures. Lower impact energies and higher ductile-to-brittle-transitiontemperatures (DBTTs) were observed with the steels containing 1.5 and 1.9 wt.% Si. The steels containing higher Si levels exhibited both ductile and brittle failures at elevated temperatures. However, at lower temperatures, brittle failures characterized by cleavage and intergranular cracking were observed for all four tested materials.

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Cracking of Martensitic Alloy EP-823 Under Controlled Potential

Cited by 8 publications

References 9 publications

Effects of Silicon Content and Tempering Temperature on the Microstructural Evolution and Mechanical Properties of HT-9 Steels

Effects of Silicon Content and Tempering Temperature on the Microstructural Evolution and Mechanical Properties of HT-9 Steels

The Role of Silicon Content on Environmental Degradations of T91 Steels

The Effect of Silicon Content on Impact Toughness of T91 Grade Steels

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