Influence of Tempering Temperature on the Microstructure and Mechanical Properties of a Cr–Ni–Mo‐Alloyed Steel for Rock Drill Applications

Zhao, Ming-Chun; Unenbayar, Tuguldur; Zhao, Yingchao; Liu, Chao; Tian, Yan; Yin, Dong; Atrens, Andrej

doi:10.1002/srin.201900297

Cited by 6 publications

(4 citation statements)

References 23 publications

(22 reference statements)

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“…So far, the UGF/C microstructure has been directly applied in research and practical production, which does not require annealing. For engineering applications, steels must meet the requirements of strength and ductility, which are measured in a tensile test [ 4 , 5 ]. Therefore, these mechanical properties are an important performance target for steels.…”

Section: Introductionmentioning

confidence: 99%

Comparison on Tensile Characteristics of Plain C–Mn Steel with Ultrafine Grained Ferrite/Cementite Microstructure and Coarse Grained Ferrite/Pearlite Microstructure

et al. 2021

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This work investigated the tensile characteristics of plain C–Mn steel with an ultrafine grained ferrite/cementite (UGF/C) microstructure and coarse-grained ferrite/pearlite (CGF/P) microstructure. The tensile tests were performed at temperatures between 77 K and 323 K. The lower yield and the ultimate tensile strengths were significantly increased when the microstructure was changed from the CGF/P to the UGF/C microstructures, but the total elongation and the uniform elongation decreased. A microstructural change from the CGF/P microstructure to the UGF/C microstructure had an influence on the athermal component of the lower yield and the ultimate tensile strengths but not on the thermal component. The UGF/C microstructure with a higher carbon content provided a higher strength without losing ductility because cementite particles restrained necking.

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Section: Introductionmentioning

confidence: 99%

Comparison on Tensile Characteristics of Plain C–Mn Steel with Ultrafine Grained Ferrite/Cementite Microstructure and Coarse Grained Ferrite/Pearlite Microstructure

et al. 2021

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“…And the concentrations of Cr and Ni were similar and so were the segregation ratios. The enrichment of Cr, Ni and Mo would reduce the critical cooling rate during quenching, and improve the hardenability of the material, and contribute to the formation of martensite 13) .…”

Section: Assess the Banded Structure In The Drill Steelmentioning

confidence: 99%

Assessing the Banding Degree of Martensite in the Bainite Matrix through EPMA

Meng,

Yan,

Wen

et al. 2024

ISIJ Int.

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Due to the difficulty of distinguishing the grain boundaries between martensite and bainite in fastcooling microstructures, few good methods were reported to accurately assess the banding degree of martensite or bainite. In present work, a novel method has been developed to meet this challenge. The hot rolled bars of drill steel 23CrMoNi, which had martensite bands distributed in the bainite matrix, were used in this research. The banded structure in this hot rolled 23CrMoNi was closely related to the segregation of the alloying elements such as Cr, Ni and Mo. These alloying element mappings were first acquired by electron probe micro analyzer (EPMA). A new data processing method was developed to correlate the segregated element mapping with the banded structure. The banding assessment was conducted on the processed binary images of element mappings according to ASTM E1268-19. This method was well verified by assessing the banded pearlite in the ferrite matrix, whose banding degree can be easily accessed through microstructure difference. It was shown from the quantitative analysis results of the hot rolled 23CrMoNi that the banded distribution of martensite was greatly optimized by the adjustment of hot rolling process.

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“…Simultaneously, it also bears multiplied loads such as tension, torsion, shear, and bending stress [1,2]. These steels are typically bainitic which can easily form during cooling [3][4][5][6][7][8]. Hence, annealing treatment must be carried out to reduce the hardness for the requirement of machinability.…”

Section: Introductionmentioning

confidence: 99%

Effect of Initial Microstructure on Soft Annealing of a Low-Carbon Bainitic Steel

Zhu

Yang

et al. 2021

The 1st International Electronic Conference on Metallurgy and Metals

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A low-carbon bainitic tool steel exhibiting high hardness after hot rolling typically has poor machinability. To soften this type of steel and to accelerate the soft annealing process, an austenitizing step was designed based on thermodynamic calculations of phase stability and introduced prior to the annealing step. Different initial microstructures were prepared by three austenitizing temperatures (680 °C, 850 °C, 1000 °C) and three cooling methods (water quenching, oil quenching, and air cooling). The effect of initial microstructure on microstructures and hardness was studied. Softening equations, a function of annealing temperature and time, were established for different initial microstructures, and the relationships between annealing temperature, annealing time, activation energy, and hardness were explored. The predicted hardness was consistent with the measured values. Martensitic structure has a low activation energy for diffusion and a higher softening rate compared to that of the bainitic structure. In addition, the higher the carbide content in the bainitic structure, the smaller the activation energy tended to be.

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Influence of Tempering Temperature on the Microstructure and Mechanical Properties of a Cr–Ni–Mo‐Alloyed Steel for Rock Drill Applications

Cited by 6 publications

References 23 publications

Comparison on Tensile Characteristics of Plain C–Mn Steel with Ultrafine Grained Ferrite/Cementite Microstructure and Coarse Grained Ferrite/Pearlite Microstructure

Comparison on Tensile Characteristics of Plain C–Mn Steel with Ultrafine Grained Ferrite/Cementite Microstructure and Coarse Grained Ferrite/Pearlite Microstructure

Assessing the Banding Degree of Martensite in the Bainite Matrix through EPMA

Effect of Initial Microstructure on Soft Annealing of a Low-Carbon Bainitic Steel

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