Influence of thermal homogenization treatment on structure and impact toughness of H13 ESR steel

Dangshen, Ma; Zhou, Jian; Zai-zhi, Chen; Zhang, Zhong-kan; Chen, Qian; Li, De-hui

doi:10.1016/s1006-706x(10)60011-8

Cited by 49 publications

(29 citation statements)

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“…Thus, the heat treatment process has significant effects on the properties of the carbides and hence on the quality of the steel. Extensive research has been performed on both the solidification process in H13 and the effects of heat treatment; changes in the microstructure and categories of carbides have been studied in the laboratory and also at the industrial plant scale [6][7][8]. By electrolytically extracting precipitates after tempering H13, Song et al [9] discovered that the carbides in H13 were mainly V 8 C 7 , which not only includes pseudo-eutectic carbides not dissolved in H13 during forging, but also includes the secondary hardening carbides precipitated from martensite.…”

Section: Introductionmentioning

confidence: 99%

Precipitation Behavior of Carbides in H13 Hot Work Die Steel and Its Strengthening during Tempering

Ning

Mao

Chen

et al. 2017

Metals

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Abstract:The properties of carbides, such as morphology, size, and type, in H13 hot work die steel were studied with optical microscopy, transmission electron microscopy, electron diffraction, and energy dispersive X-ray analysis; their size distribution and quantity after tempering, at different positions within the ingot, were analyzed using Image-Pro Plus software. Thermodynamic calculations were also performed for these carbides. The microstructures near the ingot surface were homogeneous and had slender martensite laths. Two kinds of carbide precipitates have been detected in H13: (1) MC and M 6 C, generally smaller than 200 nm; and (2) M 23 C 6 , usually larger than 200 nm. MC and M 6 C play the key role in precipitation hardening. These are the most frequent carbides precipitating at the halfway point from the center of the ingot, and the least frequent at the surface. From the center of the ingot to its surface, the size and volume fraction of the carbides decrease, and the toughness improves, while the contribution of the carbides to the yield strength increases.

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Section: Introductionmentioning

confidence: 99%

Precipitation Behavior of Carbides in H13 Hot Work Die Steel and Its Strengthening during Tempering

Ning

Mao

Chen

et al. 2017

Metals

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“…It reveals that Cr and C elements are enriched in interdendritic areas, whereas the Ni element exhibits a slight decrease (Figure 7b). During the solidification of the ingot, the interdendritic areas enrich carbon and chromium [7], which always form larger carbides (Figure 7a) due to severe dendrite segregation. Furthermore, SEM analysis was conducted to reveal the dendrite segregation distribution in Specimens A (NiCrMoV), B (TZ), and C (CrMoV).…”

Section: Macrosegregation Of the Esr Ingotmentioning

confidence: 99%

“…Practice has shown that ESR ingots with a small grain growth angle can exhibit improved hot forging performance [5]. Enormous mathematical models and experiments [4][5][6][7] have confirmed that the local temperature gradients and solidification conditions have a vital effect on the structure of ESR ingots. However, the subtle differences of the structural evolution in different zones of ESR dual alloy ingot have rarely been reported.…”

Section: Introductionmentioning

confidence: 99%

“…Macrosegregation is one of most common and serious defects in ESR ingots that occurs in the solidification process because of the uneven distribution of the solute in the liquid and solid phases [2]. Dendrite segregation is also common in ESR ingots due to interdendritic elemental enrichment [7]. Some researchers have used mathematical models to study the element redistribution in ingots [8,9].…”

Section: Introductionmentioning

confidence: 99%

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The Structural Evolution and Segregation in a Dual Alloy Ingot Processed by Electroslag Remelting

Liu

Zhang

et al. 2016

Metals

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Abstract:The structural evolution and segregation in a dual alloy made by electroslag remelting (ESR) was investigated by various analytical techniques. The results show that the macrostructure of the ingot consists of two crystallization structures: one is a quite narrow, fine, equiaxed grain region at the edge and the other is a columnar grain region, which plays a leading role. The typical columnar structure shows no discontinuity between the CrMoV, NiCrMoV, and transition zones. The average secondary arm-spacing is coarsened from 35.3 to 49.2 µm and 61.5 µm from the bottom to the top of the ingot. The distinctive features of the structure are attributed to the different cooling conditions during the ESR process. The Ni, Cr, and C contents markedly increase in the transition zone (TZ) and show a slight increase from the bottom to the top and from the surface to the center of the ESR ingot due to the partition ratios, gravity segregation, the thermal buoyancy flow, the solutal buoyancy flow, and the inward Lorentz force. Less dendrite segregation exists in the CrMoV zone and the transition zone due to a stronger cooling rate (11.1 and 4.5 • C/s) and lower Cr and C contents. The precipitation of carbides was observed in the ingot due to a lower solid solubility of the carbon element in the α phase.

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“…Hu et al 3) studied the effect of Nb on the coursing behavior of M 23 C 6 in H13 steel under different aging time, and found that addition of Nb can retard the coursing of M 23 C 6 . Ma et al 4,5) studied the effect of high temperature homogenizing treatment and hot forging treatment to carbide segregation existed in H13 steel, they reported that carbide segregation were eliminated effectually and improvement of the isotropy. The morphology and distribution of carbides in H13 steel had been improved obviously after cryogenic treatment 6) .…”

Section: Introductionmentioning

confidence: 99%

Evolution of Carbides in H13 Steel in Heat Treatment Process

Wang

Shi

et al. 2017

Mater. Trans.

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In the present work, the carbides in H13 steel were investigated with scanning electron microscope (SEM), energy dispersive spectrum (EDS), X-ray diffraction (XRD), and quantitative analysis method. The experimental results were compared with the calculation results by Thermo-calc software. The results show that the dendritic segregation exists generally in H13 ingots, primary M(C, N), M 6 (C, N) and a small amount of secondary carbides M 7 C 3 precipitate in the segregation area. The composition segregation is improved after annealing and forging process. A large amount of secondary carbides M 7 C 3 precipitate in the segregation area after annealing process. Primary carbide M 6 (C, N) are almost dissolved and M(C, N) are partially dissolved in the forged and annealed H13 steel. Most of carbides in the quenched and tempered H13 steel are ne secondary M 6 (C, N), M 23 C 6 and M(C, N), besides a small amount of primary M(C, N) with smaller size. The evolution mechanism of carbides in heat treatment process was clari ed by the calculated results.

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Influence of thermal homogenization treatment on structure and impact toughness of H13 ESR steel

Cited by 49 publications

References 0 publications

Precipitation Behavior of Carbides in H13 Hot Work Die Steel and Its Strengthening during Tempering

Precipitation Behavior of Carbides in H13 Hot Work Die Steel and Its Strengthening during Tempering

The Structural Evolution and Segregation in a Dual Alloy Ingot Processed by Electroslag Remelting

Evolution of Carbides in H13 Steel in Heat Treatment Process

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