Effects of heat treatment on the microstructures and mechanical properties of a new type of nitrogen-containing die steel

Li, Jingyuan; Zhao, Peng; Ye, Jun; Sugiyama, Sumio; Chen, Yulai

doi:10.1007/s12613-012-0588-0

Cited by 22 publications

(12 citation statements)

References 6 publications

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“…(14) Other related studies on the quenching and tempering of different steels have also been reported. (15)(16)(17)(18)(19)(20)(21) From the past research, it is known that many factors in the heat treatment affect the properties of steel wires after heat treatment. For instance, the wire diameter, wire weight, heating temperature, heating time, and cooling rate in the heat treatment could all affect the properties.…”

Section: Literature Reviewmentioning

confidence: 99%

Estimation of Screw’s Physical Properties Using Neural Network

Lu¹,

Huang²,

Wu³

et al. 2021

Sensors and Materials

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In this paper, the estimation of a screw's physical properties using a neural network (NN) technique is presented. The aim of this research is to study the effects of various control parameters of heat treatment and spheroidization on the physical properties of an alloy steel wire in its manufacturing process. The NN model is used to analyze the data collected by the image sensor and temperature sensor for heating treatments of alloy steel wire. It is expected that an advanced screw manufacturing system with intelligent analysis ability can be developed. Then, this smart system will be able to provide the optimal control parameters in real time to produce an alloy steel wire with ideal physical properties so that high-quality screws can be produced in the later manufacturing process. The results of this study show that the NN model can indeed achieve a fairly accurate estimation of the physical properties of a steel wire after the spheroidization, quenching, and tempering heat treatments. This shows that the development of an artificial-intelligence-based screw process optimization mechanism is very feasible.

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Section: Literature Reviewmentioning

confidence: 99%

Estimation of Screw’s Physical Properties Using Neural Network

Lu¹,

Huang²,

Wu³

et al. 2021

Sensors and Materials

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“…9. The thixoforming behaviors of the semisolid slurries were affected by their liquid fractions and the morphologies of the solid phases [14]. When thixocompression tests were conducted at lower semisolid temperatures, the outflow of the liquid phase with a lower volume fraction was difficult.…”

Section: Semisolid Compressionmentioning

confidence: 99%

Microstructural Evolution during Partial Melting and Semisolid Forming Behaviors of Two Hot-Extruded Magnesium-Rare Earth Alloys

et al. 2018

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Reheating experiments and semisolid compression tests were conducted on two hot-extruded magnesium-rare earth (Mg-RE) alloys, Mg-8.20Gd-4.48Y-0.36Zr-3.34Zn and Mg-3.75Gd-5.15Y-0.75Zr-3.05Zn by using a multistage hot compression test machine. Dissolution of eutectic compounds, growth of grains, and partial melting took place during the reheating of these Mg-RE alloys and resulted in spherical semisolid slurries at certain temperatures (580 °C for Mg–8.20Gd–4.48Y–3.34Zn–0.36Zr, 560 °C for Mg-3.75Gd-5.15Y-0.75Zr-3.05Zn). Owing to the different alloying element contents of these two Mg-RE alloys, eutectic compounds with different morphologies were found inside them after reheating and rapid cooling processes. The forming characteristics of these two Mg-RE alloys in semisolid state were discussed based on the results of compression tests.

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“…When the aging temperature was at 720 • C, significant secondary hardening occurred, and the hardness reached the maximum value of 47.24 HRC. It can be attributed to the enrichment and segregation of precipitate-forming elements at 720 • C, such as V, Mo, Cr, C, and N [8]. As the aging temperature continued to increase, the hardness decreased to 45.04 HRC at 760 • C. As for the two-stage aging, pre-aging and re-aging heat treatment experiments were carried out, shown in Table 3.…”

Section: Effect Of Aging Heat Treatment On Mechanical Properties and mentioning

confidence: 99%

“…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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Effects of heat treatment on the microstructures and mechanical properties of a new type of nitrogen-containing die steel

Cited by 22 publications

References 6 publications

Estimation of Screw’s Physical Properties Using Neural Network

Estimation of Screw’s Physical Properties Using Neural Network

Microstructural Evolution during Partial Melting and Semisolid Forming Behaviors of Two Hot-Extruded Magnesium-Rare Earth Alloys

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

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