Effect of NbC precipitation on toughness of X12CrMoWNbVN10-1-1 martensitic heat resistant steel for steam turbine blade

Li, Yong; Cai, Zhipeng; Hu, Minqiang; Li, Kejian; Hou, Mei; Pan, Jiluan

doi:10.1016/j.jmrt.2021.02.049

Cited by 16 publications

(6 citation statements)

References 24 publications

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“…15. On the basis of instrumented Charpy impact test, the ideal curve generally involves five stages [50][51][52], i.e., elastic deformation stage, plastic deformation stage, ductile propagation stage, brittle propagation stage and ductile fracture stage, as shown in Fig. 15a.…”

Section: The Dependence Of Impact Toughness On Microstructural Featuresmentioning

confidence: 99%

Microstructural evolutions and impact toughness in simulated welding heat affected zones for a high-strength carbide-free bainitic rail steel

Bai

Liu

et al. 2023

Materials Science and Engineering: A

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Section: The Dependence Of Impact Toughness On Microstructural Featuresmentioning

confidence: 99%

Microstructural evolutions and impact toughness in simulated welding heat affected zones for a high-strength carbide-free bainitic rail steel

Bai

Liu

et al. 2023

Materials Science and Engineering: A

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“…Microscopic observations indicate that there were also some intracrystalline microcracks nucleating in large-size precipitates, suggesting their damaging role in fracture. Li et al [38] indicated that a large number of MC-type particles can cause brittle steel fracture. The propagation of the crack follows the interfacial boundaries [39].…”

Section: Testing a Fractured Valvementioning

confidence: 99%

Metallographic Evaluation of Increased Susceptibility to Intermediate Embrittlement of Engine Valve Forgings Made of NCF 3015 High Nickel and Chromium Steel

Lachowicz,

Zwierzchowski,

Hawryluk

et al. 2023

Materials

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This paper focused on determining the increased tendency of cracking after the die forging process of high nickel and chromium steel. The increase in carbon content in austenitic nickel–chromium steel promoted the tendency of valve forgings to forging intergranular crack on the valve head. Attention was paid to issues related to the chemical composition of the material to be considered when hot forming nickel–chromium steel components. Optical and scanning electron microscopies were used to examine the microstructure and fracture features of the samples removed from a fractured valve head. The embrittlement was due to microcavity formation at grain boundaries. Creep theory at grain boundaries was used to explain crack formation. The tensile behavior was interpreted from the evolution of the microstructure during deformation and referred to intermediate brittleness to explain the effect of carbon. It was found that the increased carbon content of the nickel–chromium steel and the strong undercooling observed at the edges of the valve head are factors that promote a reduction in grain boundary cohesion and enhance intermediate temperature embrittlement. Finally, it was found that the formation of a heterogeneous structure manifested by the presence of grain boundary M23C6-type carbides in the austenitic matrix was most likely related to the occurring brittleness.

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“…The other was the fact that some small-angle lath boundaries evolved gradually into largeangle boundaries. Several studies have indicated [43] that when cleavage cracks attempt to propagate through a large-angle boundary, the crystal orientation and crack direction may change, and then the growth of cracks may eventually be stopped. Consequently, an increasing amount of large-angle boundaries would lead to a larger deflection of cleavage cracks, and a higher toughness could be obtained.…”

Section: Mechanical Properties Under Different Tempering Timesmentioning

confidence: 99%

Effect of Tempering Time on Carbide Evolution and Mechanical Properties of a Nb-V-Ti Micro-Alloyed Steel

Zhao,

Qiao,

Dong

2023

Metals

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The evolution of the microstructure, the precipitation behavior, and the mechanical performances of Nb-V-Ti micro-alloyed steel prepared under different tempering time were studied using transmission electron microscopy (TEM), X-ray diffraction (XRD), and mechanical tests. It was found that the width of the martensite laths increases with the increasing tempering time. Several kinds of carbides, including M3C, M2C, M23C6, M7C3, and MC particles, were identified after tempering. The MC carbides remain stable during tempering, but the transformation behavior of other carbides was identified. The transformation sequence can be summarized as: M3C → M2C → M7C3 → M23C6. The strength decreases and the Charpy impact toughness increases gradually with the increase in the tempering time. The ultimate strength (UTS) decreases from 1231 to 896 MPa, and the yield strength (YS) decreases from 1138 to 835 MPa. The −40 °C Charpy impact toughness increases from 20 to 61 J as the tempering time increases from 10 min to 100 h. The evolution of carbides plays an important role in their mechanical performances.

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Effect of NbC precipitation on toughness of X12CrMoWNbVN10-1-1 martensitic heat resistant steel for steam turbine blade

Cited by 16 publications

References 24 publications

Microstructural evolutions and impact toughness in simulated welding heat affected zones for a high-strength carbide-free bainitic rail steel

Microstructural evolutions and impact toughness in simulated welding heat affected zones for a high-strength carbide-free bainitic rail steel

Metallographic Evaluation of Increased Susceptibility to Intermediate Embrittlement of Engine Valve Forgings Made of NCF 3015 High Nickel and Chromium Steel

Effect of Tempering Time on Carbide Evolution and Mechanical Properties of a Nb-V-Ti Micro-Alloyed Steel

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