Mechanism of improvement on strength and toughness of H13 die steel by nitrogen

Li, Jingyuan; Chen, Yulai; Huo, Jian-Hua

doi:10.1016/j.msea.2015.05.006

Cited by 73 publications

(22 citation statements)

References 23 publications

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“…For example, the lattice plane (110) peaks are located at 44.15° and 44.50° for the nitrogen-alloyed and nitrogen-free steel tempered at 600 °C, respectively, and 44.40° and 44.55° for those at 650 °C, respectively although it is located at 44.66° for standard α-Fe [26]. This shift mainly results from an oversaturated body-centered cubic structure of martensite.…”

Section: Lattice Distortionmentioning

confidence: 96%

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Microstructure and Strengthening-Toughening Mechanism of Nitrogen-Alloyed 4Cr5Mo2V Hot-Working Die Steel

Chen

2017

Metals

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Abstract:The microstructure and strengthening-toughening mechanism of a modified 4Cr5Mo2V hot-working die steel with nitrogen (0.08% N) were investigated using hardness and toughness measurements, optical microscopy, scanning electron microscopy, X-ray diffraction experiments, transmission electron microscopy, and dilatometry. The results showed that the nitrogen addition could increase the hardness and temperability of 4Cr5Mo2V steel without toughness loss with a suitable heat treatment procedure. The fair match of high strength and toughness of the nitrogen-alloyed 4Cr5Mo2V steel is associated with the refinement of the prior austenite grain, the solution hardening of nitrogen atoms, and the increase of retained austenite. Before quenching, nitrogen tends to precipitate in the form of a large amount of undissolved finer V(C, N), imposing a stronger effect on restricting the growth of prior austenitic grains and increasing the grain refining efficiency of VC by 6.8 times according to an estimate. During the quenching process, the nitrogen decreases the M S of the martensitic transformation, increasing retained austenite, which is a benefit for toughness. During the tempering process, some of the N atoms in M(C, N) were dissolved in the matrix, causing crystal lattice distortions, thus boosting the solution reinforcing effect. Meanwhile, the solid-dissolved nitrogen inhibits the diffusion of carbon, decreasing the growth rate of the carbides and increasing tempering resistance.

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Section: Lattice Distortionmentioning

confidence: 96%

“…Previous studies have shown that the properties of steel are closely related to the size, shape, and volume fraction of the precipitates [23][24][25][26][27][28]. Moreover, the added nitrogen has an effect on the evolution of precipitates at different stages of the heat treatment.…”

Section: Precipitatesmentioning

confidence: 99%

Microstructure and Strengthening-Toughening Mechanism of Nitrogen-Alloyed 4Cr5Mo2V Hot-Working Die Steel

Chen

2017

Metals

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“…Yahui HAN, 1) Changsheng LI, 1) * Jinyi REN, 1) Chunlin QIU, 1) Yongqiang ZHANG 2) and Jiayou WANG 2) 1) State Key Lab of Rolling and Automation, Northeastern University, Shenyang, 118019 P. R. China. 2) Hubei Xinyegang Steel Co., Ltd, Huangshi, 435001 P. R. China.…”

Section: Dendrite Segregation Changes In High Temperature Homogenizatmentioning

confidence: 99%

“…Its operating temperature is up to 600°C, which is quite closed to the subsequent tempering temperature. 1,2) Excellent high temperature strength, impact toughness, hot cracking resistance and thermal fatigue of H13 are required. 3) Researches 4,5) have shown that, to a great extent, there has the relation between the resistance to heat checking and impact toughness.…”

Section: Introductionmentioning

confidence: 99%

Dendrite Segregation Changes in High Temperature Homogenization Process of As-cast H13 Steel

Han

Ren

et al. 2019

ISIJ Int.

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“…According to these characteristics, high-nitrogen steels, especially high-nitrogen austenitic stainless steels, have been studied intensively in recent years [5][6][7]. In addition, it also reported that the effects of nitrogen element increase the impact toughness of steel and high-temperature strength of hot work die steels [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on the Microstructure and Mechanical Properties of Nitrogen-Alloyed High-Mn Austenitic Hot Work Die Steel

Zhang¹,

Li²,

Shi³

et al. 2017

Metals

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Abstract:In view of the requirements for mechanical properties and service life above 650 • C, a high-Mn austenitic hot work die steel, instead of traditional martensitic hot work die steel such as H13, was developed in the present study. The effect of heat treatment on the microstructure and mechanical properties of the newly developed work die steel was studied. The results show that the microstructure of the high-Mn as-cast electroslag remelting (ESR) ingot is composed of γ-Fe, V(C,N), and Mo 2 C. V(C,N) is an irregular multilateral strip or slice shape with severe angles. Most eutectic Mo 2 C carbides are lamellar fish-skeleton-like, except for a few that are rod-shaped. With increasing solid solution time and temperature, the increased hardness caused by solid solution strengthening exceeds the effect of decreased hardness caused by grain size growth, but this trend is reversed later. As a result, the hardness of specimens after various solid solution heat treatments increases first and then decreases. The optimal combination of hardness and austenitic grain size can be obtained by soaking for 2 h at 1170 • C. The maximum Rockwell hardness (HRC) is 47.24 HRC, and the corresponding austenite average grain size is 58.4 µm. When the solid solution time is 3 h at 1230 • C, bimodality presented in the histogram of the austenite grain size as a result of further progress in secondary recrystallization. Compared with the single-stage aging, the maximum impact energy of the specimen after two-stage aging heat treatment was reached at 16.2 J and increased by 29.6%, while the hardness decreased by 1-2 HRC. After two-stage aging heat treatment, the hardness of steel reached the requirements of superior grade H13, and the maximum impact energy was 19.6% higher than that of superior grade H13, as specified in NADCA#207-2003.

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Mechanism of improvement on strength and toughness of H13 die steel by nitrogen

Cited by 73 publications

References 23 publications

Microstructure and Strengthening-Toughening Mechanism of Nitrogen-Alloyed 4Cr5Mo2V Hot-Working Die Steel

Microstructure and Strengthening-Toughening Mechanism of Nitrogen-Alloyed 4Cr5Mo2V Hot-Working Die Steel

Dendrite Segregation Changes in High Temperature Homogenization Process of As-cast H13 Steel

Effect of Heat Treatment on the Microstructure and Mechanical Properties of Nitrogen-Alloyed High-Mn Austenitic Hot Work Die Steel

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