A study of reactions occurring during the carbonitriding process

Slycke, J.; Ericsson, Torsten

doi:10.1007/bf02833069

Cited by 35 publications

(19 citation statements)

References 10 publications

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“…Addition of nitrogen on carburizing process turn it to carbonitriding process [6]. There were almost stabil hardness condition at 120 minute holding time because of the retained austenite that formed significantly under nitrogen influence.…”

Section: Resultsmentioning

confidence: 90%

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Hardness improvement on low carbon steel using pack carbonitriding method with holding time variation

Puspitasari¹,

Andoko²,

Suryanto³

et al. 2017

MATEC Web Conf.

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Abstract. Carbonitriding is a surface hardening process of steel by heating on critical temperature, quench and followed by tempering process. In this research, pack media in carbonitriding was used as a new method. Usually, this process has been obtained using gas and liquid carbonitriding methods. The specimen used in this research is low carbon steel (St. 41) consist of 0.1517% carbon, 0.1994% of silicon, 0.5631% of manganese, 0.0224% of phosphorus, and 0.047% of sulfur. Temperature for pack carbonitriding was at 700 o C, 750 o C and 800 o C and holding time variation 60 minutes and 120 minutes respectively. The result showed that carbonitriding temperature difference affect the mechanical properties of steel St. 41. Steel hardness was increased at lower holding time (60 minutes) compared to 120 minutes. The result showed that at 700 o C and 750 o C with 60 minutes variation, the steel hardness increase from 85.7 HRB to 95.7 HRB and at 800 0 C the hardness decrease to 93.1 HRB. Meanwhile, at holding time of 120 minutes, steel hardness decrease from 94.1 HRB to 92.7 HRB. This result caused by austenite phase produced at longer period of holding time.

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Section: Resultsmentioning

confidence: 90%

“…Addition of nitrogen on carburizing process turn it to carbonitriding process [6]. These are micro photo result of carbonitriding process with time holding and temperature variation.…”

Section: Microstructure Thicknessmentioning

confidence: 99%

Hardness improvement on low carbon steel using pack carbonitriding method with holding time variation

Puspitasari¹,

Andoko²,

Suryanto³

et al. 2017

MATEC Web Conf.

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“…Stickstoff und Kohlenstoff stehen in fester Lösung im Stahl in direkter Konkurrenz um die im Austenit verfügbaren Gitterlücken-plätze [11]. Die Aktivität kann unter Berücksichtigung der Molenbrüche beider Elemente näherungsweise berechnet werden (mit i = N oder i = C).…”

Section: Wechselwirkung Von Kohlenstoff Und Stickstoff In Fester Lösungunclassified

Neue Randschichtgefüge carbonitrierter Bauteile und deren Festigkeitseigenschaften

Steinbacher¹,

Hoffmann²,

Zoch³

et al. 2015

HTM Journal of Heat Treatment and Materials

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Kurzfassung/AbstractToday case hardening of highly stressed gear wheels is state of the art, to meet the specific load demands at flank and tooth root. The heat treatment is including a carburization and quenching step in liquids or in gaseous media. The result of the heat treatment of gear wheels is strongly impacting the strength and the load capacity at flank and foot of the treated gears. The typical requirement for the microstructure in the surface near case is a well balanced mixture of finely dispersed retained austenite and martensite. Hard intermediate phases like cementite or other carbides are objectionable. Carbonitriding is an up to now unusual thermo-chemical treatment for parts made of case hardening steels. In the past it was typically applied to increase hardness or hardenability of low alloy steels of moderate hardenability. To do so, the treatment atmosphere was modified by the addition of fixed ammonia rates at low treatment temperatures. Newly developed automatically controlled carbonitriding processes make it possible to set up defined carbon-and nitrogen-depth profiles leading into a significant altered phase-composition of the case. The paper will give an overview on different phase compositions being achievable via carbonitriding and will give examples of carbonitrided samples made of case hardening steels, showing the influence of the heat treatment process and its atmosphere parameters. Also a perspective on the latest development of heat treatment technology for a designated set up of independently controlled carbon and nitrogen potentials for defined depth profiles will be given regarding the interdependency of both elements with each other and the alloy elements. n

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“…Winter (9) presented a new system that enables us to measure and control both the carbon potential and the nitrogen potential independently. Slycke and Ericsson (10) have studied theoretically and experimentally the reactions occurring during carbonitridation. Semenova et al (11) considered the regular features of the formed diffusion layers in the temperature-cycle carbonitridation of steel 20 Kh and used the solution of the general diffusion problem to determine the diffusivity of carbon.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Case Treating AISI 1022 Timber Screw Process Parameters Using Taguchi Method

2018

Sensors and Materials

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The manufacturing processes of timber screws, which are widely used for wood construction work, include wire manufacturing, heading and threading, case treatment, and coating. A lowcarbon steel wire of AISI 1022 is used to easily fabricate timber screws. The majority of case treatment activities are performed to improve the screw strength without affecting the soft, tough interior of the screws in drilling operation. In this study, the Taguchi method is used to obtain optimum case treatment conditions to improve the mechanical properties of AISI 1022 timber screws. The quality of case-treated timber screws is affected by various factors, such as case treatment temperature, case treatment time, atmosphere composition, and tempering temperature. The effects of case treatment parameters affect the quality characteristics, such as case hardness and torsional strength. It is experimentally revealed that ammonia flow rate, case treatment time, and carbon potential are significant for case hardness, while methanol flow rate, case treatment temperature, and case treatment time are significant for torsional strength. The optimum mean case hardness is 673.1 HV, the optimum mean core hardness is 440.0 HV and, for torsional strength, the optimum mean value is 5.3 N⋅m. The new case treatment parameter settings evidently improve the performance. The strength of the case-treated AISI 1022 timber screws is effectively improved. These results may be used as a reference for fastener manufacturers.

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A study of reactions occurring during the carbonitriding process

Cited by 35 publications

References 10 publications

Hardness improvement on low carbon steel using pack carbonitriding method with holding time variation

Hardness improvement on low carbon steel using pack carbonitriding method with holding time variation

Neue Randschichtgefüge carbonitrierter Bauteile und deren Festigkeitseigenschaften

Optimization of Case Treating AISI 1022 Timber Screw Process Parameters Using Taguchi Method

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