Characterization of carburized 14Cr14Co13Mo4 stainless steel by low pressure carburizing

Yin, Liang; Ma, Xinxin; Tang, Guangze; Fu, Zhongyuan; Yang, Shuxin; Wang, Tingjian; Wang, Liqin; Li, Liuhe

doi:10.1016/j.surfcoat.2018.11.090

Cited by 26 publications

(13 citation statements)

References 27 publications

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“…The uneven distribution of M7C3 indicates that the carburization is not uniform. As shown in Figure 3e,f, the M7C3 distribution in the as-carburized layer of Fe-Ni film-coated samples became more uniform than that of the uncoated one, and the depth of the M7C3 distribution was deeper in the steel coated According to our previous research results [14], the 14Cr14Co13Mo4 steel carburized at 890 • C M 7 C 3 precipitated mainly in the high-carbon content region, and M 23 C 6 dominated in the low-carbon content region. The type of carbide can be directly distinguished by backscattered electron images.…”

Section: Experimental Design Principlesupporting

confidence: 64%

“…The carbide distribution was more uniform in the sample coated with 6.0 μm Fe-Ni film than that with 1.4 μm Fe-Ni film. According to our previous research results [14], the 14Cr14Co13Mo4 steel carburized at 890 °C M7C3 precipitated mainly in the high-carbon content region, and M23C6 dominated in the low-carbon content region. The type of carbide can be directly distinguished by backscattered electron images.…”

Section: Experimental Design Principlesupporting

confidence: 53%

“…A method for calculating the carbon diffusion in the 14Cr14Co13Mo4 steel according to the LPC process has been build up in our previous paper [14], and is adopted in this paper to calculate carbon diffusion. Figure 1a shows the schematic of the calculation model.…”

Section: Experimental Design Principlementioning

confidence: 99%

“…Figure 1a shows the schematic of the calculation model. Detailed simulation method can be found in our previous article [14]. The red dashed line in Figure 1b shows the simulated carbon content on the 14Cr14Co13Mo4 steel surface as a function of carburization time.…”

Section: Experimental Design Principlementioning

confidence: 99%

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Pre-Coated Fe–Ni Film to Promote Low-Pressure Carburizing of 14Cr14Co13Mo4 Steel

Yin

Wang

et al. 2019

Coatings

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Case-hardening 14Cr14Co13Mo4 martensitic stainless steel needs to be carburized to improve surface performance. Low-pressure carburization has the benefit of having oxidation-free production and being ecofriendly. However, compared with the low-pressure carburization of the low-alloy steel, low-pressure carburization of the 14Cr14Co13Mo4 steel consumes more time and has a risk of network carbides. In order to promote carbon diffusion and avoid network carbide, Fe–Ni films with various thickness were electrodeposited on the 14Cr14Co13Mo4 steel prior to low-pressure carburization. The experimental results show that, under the same carburizing conditions, the surface carbon content decreases and the carburized layer increases with the increase of Fe–Ni film thickness. After the hardening heat treatment, the effective case depth (ECD) of the sample coated with 6.0 μm Fe–Ni film was increased by 29% compared to that of the uncoated sample. The morphology of carbides was a strip-shaped, discontinuous network distribution in the uncoated sample, while in the Fe–Ni coated samples, the carbides changed to a globular, uniformly dispersed distribution. The effect of Fe–Ni film on the low-pressure carburizing of steel is explained by the simulation of the carbon diffusion using DICTRA software. The Fe–Ni films reduce the steel surface carbon content in each boost stage of low-pressure carburizing and release carbon atoms in every diffusion stage. Through this adjustment mechanism, the steel surface carbon content can be reduced and carburized layer growth can be promoted.

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Section: Experimental Design Principlesupporting

confidence: 64%

Section: Experimental Design Principlesupporting

confidence: 53%

Section: Experimental Design Principlementioning

confidence: 99%

Section: Experimental Design Principlementioning

confidence: 99%

See 2 more Smart Citations

Pre-Coated Fe–Ni Film to Promote Low-Pressure Carburizing of 14Cr14Co13Mo4 Steel

Yin

Wang

et al. 2019

Coatings

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“…Recently, studies on the carburization of CoCrFeNi HEAs have been reported [ 7 , 13 ]. Carburization is a process based on the diffusion of carbon atoms into the metal matrix to form a carburized layer [ 14 , 15 ]. Peng et al [ 7 ] studied the surface hardening of CoCrFeNi HEA by gaseous carburization at 470 °C for 40 h. The carbide-free supersaturated interstitial solid solution of carbon in the face-centered cubic (FCC) formed on the surface of the HEA enhances the surface hardness of the HEA owing to the solid solution strengthening caused by interstitially dissolved carbon atoms.…”

Section: Introductionmentioning

confidence: 99%

Effect of Grain Size on Carburization Characteristics of the High-Entropy Equiatomic CoCrFeMnNi Alloy

Nam

Kim²,

Kim

et al. 2021

Materials

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In this study, the carburization characteristics of cast and cold-rolled CoCrFeMnNi high-entropy alloys (HEAs) with various grain sizes were investigated. All specimens were prepared by vacuum carburization at 940 °C for 8 h. The carburized/diffused layer was mainly composed of face-centered cubic structures and Cr7C3 carbide precipitates. The carburized/diffused layer of the cold-rolled specimen with a fine grain size (~1 μm) was thicker (~400 μm) than that of the carburized cast specimen (~200 μm) with a coarse grain size (~1.1 mm). In all specimens, the carbides were formed primarily through grain boundaries, and their distribution varied with the grain sizes of the specimens. However, the carbide precipitates of the cast specimen were formed primarily at the grain boundaries and were unequally distributed in the specific grains. Owing to the non-uniform formation of carbides in the carburized cast specimen, the areas in the diffused layer exhibited various carbide densities and hardness distributions. Therefore, to improve the carburization efficiency of equiatomic CoCrFeMnNi HEAs, it is necessary to refine the grain sizes.

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A Time‐Saving Method for Evaluating the Fatigue Strength of Carburized High‐Alloy Steel Containing Carbides

Xu,

Gu,

Liu

et al. 2024

Adv Eng Mater

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To propose a time‐saving method for evaluating the fatigue strength of carburized steel, the fatigue behavior and fracture mechanism of carburized 14Cr14Co13Mo5 steels are studied by the rotary bending fatigue tests. It is found that the fatigue crack initiation site changes from surface to internal after carburizing due to the residual compressive stress and carbide cluster caused by the carburization. Besides, a notable correlation between the stress intensity of the cracked carbides at fatigue crack initiation site and fatigue life is observed in the carburized samples. This correlation allows for the estimation of fatigue strength at long conditional life based on samples tested at relatively high stress amplitudes with short lives, achieving a prediction error within 10% for the material studied. A significant time saving of ≈65% compared to the staircase method is achieved. The proposed method has significant implications for improving the efficiency fatigue strength evaluation in carburized steels containing carbides.

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Characterization of carburized 14Cr14Co13Mo4 stainless steel by low pressure carburizing

Cited by 26 publications

References 27 publications

Pre-Coated Fe–Ni Film to Promote Low-Pressure Carburizing of 14Cr14Co13Mo4 Steel

Pre-Coated Fe–Ni Film to Promote Low-Pressure Carburizing of 14Cr14Co13Mo4 Steel

Effect of Grain Size on Carburization Characteristics of the High-Entropy Equiatomic CoCrFeMnNi Alloy

A Time‐Saving Method for Evaluating the Fatigue Strength of Carburized High‐Alloy Steel Containing Carbides

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