Effect of nitrogen on microstructure and secondary hardening of H21 die steel

Gu, Jianan; Liu, Huaqing; Li, Jingyuan; Jiang, Yong; Chang, Ruijin

doi:10.1007/s42243-018-0164-6

Cited by 8 publications

(3 citation statements)

References 19 publications

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“…In addition, Gu et al reported that interstitial N atoms could delay the diffusion of other atoms (e.g., Mo, Cr, and V) in the matrix during the heating process. [ 41 ] This was also beneficial to increase the coarsening resistance of M 2 C secondary carbides in 0.18N steel to some extent.…”

Section: Resultsmentioning

confidence: 99%

Improved High‐Temperature Softening Resistance and Wear Resistance of AISI M42 High‐Speed Steel by N‐Alloying

Jiao

Feng

et al. 2023

steel research int.

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Herein, a novel high‐nitrogen (0.18 wt%) M42 high‐speed steel is fabricated by pressurized metallurgy. The high‐temperature softening resistance of N‐free and 0.18N steels is evaluated by hardness measurement at room temperature after additional heating at 600 °C for various times, and the high‐temperature wear resistance is evaluated by ball‐on‐disk dry sliding wear test at 600 °C. The microstructure is characterized by scanning electron microscopy (SEM), X‐ray diffraction (XRD), and high‐resolution transmission electron microscope (HRTEM). The results indicate that the hardness of 0.18N steel is 2–3 HRC higher than that of N‐free steel after additional heating at 600 °C for 4–120 h. The superior high‐temperature softening resistance of 0.18N steel is primarily ascribed to the smaller coarsening rate of M2C secondary carbides. Under the dry sliding condition at 600 °C, the wear rate of N‐free steel is approximately 1.5 times higher than that of 0.18N steel. The better high‐temperature wear resistance of 0.18N steel is primarily because the superior softening resistance makes it maintain higher hardness during the wear process to provide stronger support for the oxide layer and increase the protective ability of oxide layer to steel.

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Section: Resultsmentioning

confidence: 99%

Improved High‐Temperature Softening Resistance and Wear Resistance of AISI M42 High‐Speed Steel by N‐Alloying

Jiao

Feng

et al. 2023

steel research int.

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show abstract

“…Consequently, compared with the microalloyed steel previously studied, [ 18,19 ] the die steel with nitrogen‐substituted carbon can further play the role of nitrogen in grain refinement under high austenitizing temperature and broaden the allowable austenitizing temperature range. More importantly, it promotes the complete solution of Cr and Mo alloy elements.…”

Section: Discussionmentioning

confidence: 99%

“…[ 16,17 ] In recent years, some studies on hot‐working die steels containing nitrogen have shown that nitrogen can improve hardness without reducing toughness. [ 18,19 ] However, there are few studies on thermal stability of nitrogen alloy die steel, and alloy composition of the steel after adding nitrogen needs to be further optimized. In theory, the addition of trace amounts of nitrogen is found to replace part of carbon.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nitrogen‐Substituted Carbon on Thermal Stability of Cr‐Mo‐V Hot‐Working Die Steel

Zhang

et al. 2020

steel research int.

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To extend service life of Cr‐Mo‐V hot‐working die steel, a method of alloying with nitrogen‐substituted carbon is proposed. The mechanical properties of the test steels in the long‐time heating and holding process are measured. The effect of nitrogen‐substituted carbon on thermal stability is characterized and analyzed by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Thermo‐Calc. The results show that the ratio of N in V(C,N) can be increased by nitrogen‐substituted carbon at high temperature, which significantly improves its stability. As a result, it can not only refine the grain but also broaden the austenitizing temperature range and promote the complete solution of alloy elements such as Cr, Mo. In the process of long‐term heating and insulation, nitrogen‐substituted carbon can effectively reduce the precipitation of harmful carbides and the coarsening rate by raising the activation energy of tempering transformation with 20.0 kJ mol−1, and increase the precipitation of the main strengthening phase V(C,N). Nitrogen‐substituted carbon, as an effective alloying method, innovatively improves thermal stability and service life of Cr‐Mo‐V hot‐working die steel.

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Nitrogen-Substituting Carbon Significantly Improves Softening Resistance of H13 Hot-Work Die Steel

Wang,

Feng,

et al. 2024

Metall Mater Trans A

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Effect of nitrogen on microstructure and secondary hardening of H21 die steel

Cited by 8 publications

References 19 publications

Improved High‐Temperature Softening Resistance and Wear Resistance of AISI M42 High‐Speed Steel by N‐Alloying

Improved High‐Temperature Softening Resistance and Wear Resistance of AISI M42 High‐Speed Steel by N‐Alloying

Effect of Nitrogen‐Substituted Carbon on Thermal Stability of Cr‐Mo‐V Hot‐Working Die Steel

Nitrogen-Substituting Carbon Significantly Improves Softening Resistance of H13 Hot-Work Die Steel

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