Structure and stresses in the nitrided case

M. Ya. Fuks; E. V. Ruseva; R. D. Rusev; E. V. Vytev

doi:10.1007/bf00713768

Control of the Compound Zone or White Layer

10.31399/asm.tb.pnfn.t65900065 ◽

2003 ◽

pp. 65-70

Keyword(s):

Nitric Acid ◽

White Layer ◽

Case Depth ◽

Two Stage ◽

Zone Formation ◽

Nitrided Case ◽

Stage Process ◽

Standard Solution ◽

Nitrided Sample

Abstract The compound zone is more commonly known as the white layer, simply because when the nitrided sample is sectioned through the case, and then polished and etched with a standard solution of nital (2 to 5% nitric acid and alcohol), the immediate surface etches out white in appearance above the nitrided case. This chapter focuses on the methods to control the compound zone or white layer. It first provides information on a test to determine the presence of the white layer, and discusses the processes involved in the reduction of the compound zone by the two-stage process. Next, it describes the methods for controlling compound zone formation, and, finally, reviews the factors related to the determination of case depth nitriding.

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Examination of the Nitrided Case

10.31399/asm.tb.pnfn.t65900167 ◽

2003 ◽

pp. 167-183

Keyword(s):

Sample Preparation ◽

Microscopic Examination ◽

Hardness Testing ◽

Characterization Methods ◽

Advantages And Disadvantages ◽

Microhardness Testing ◽

Nitrided Case

Abstract Examining and evaluating the nitrided case is generally accomplished by hardness testing and microscopic examination. This chapter discusses both characterization methods, as well as sample preparation. The discussion covers the process, advantages, and disadvantages of these methods. The chapter also discusses the processes involved in the etching of the sample after microhardness testing and provides some practices that contribute to the safe preparation of specimens. Examples of nitrided case microstructures are also presented.

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Evaluation of a Nitrided Case Depth by the Magnetic Barkhausen Noise

Journal of Nondestructive Evaluation ◽

10.1007/s10921-017-0452-2 ◽

2017 ◽

Vol 36 (4) ◽

Cited By ~ 13

Author(s):

Alexandr Stupakov ◽

Róbert Farda ◽

Miroslav Neslušan ◽

Alexej Perevertov ◽

Tetsuya Uchimoto

Keyword(s):

Case Depth ◽

Barkhausen Noise ◽

Magnetic Barkhausen Noise ◽

Nitrided Case

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Artificial neural network approach to predict ion nitrided case depth and surface hardness of AISI 4340 steel

Materials Testing ◽

10.3139/120.111356 ◽

2019 ◽

Vol 61 (6) ◽

pp. 567-572

Author(s):

Sule Y. Sirin ◽

Melih İnal

Keyword(s):

Neural Network ◽

Artificial Neural Network ◽

Surface Hardness ◽

Case Depth ◽

Network Approach ◽

Neural Network Approach ◽

Aisi 4340 Steel ◽

Nitrided Case ◽

Artificial Neural ◽

Artificial Neural Network Approach

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Development of the hardness of the nitrided case

Metal Science and Heat Treatment ◽

10.1007/bf00679162 ◽

1975 ◽

Vol 17 (2) ◽

pp. 125-128 ◽

Cited By ~ 1

Author(s):

V. D. Yakhnina ◽

V. V. Nikitin

Keyword(s):

Nitrided Case

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Paper 11: Experiments in the Aerosol Lubrication of Power Gearing

Proceedings of the Institution of Mechanical Engineers Conference Proceedings ◽

10.1243/pime_conf_1966_181_313_02 ◽

1966 ◽

Vol 181 (15) ◽

pp. 184-191

Author(s):

P. G. Howell

Keyword(s):

Power Transmission ◽

No Reduction ◽

Cooling Capacity ◽

Bulk Temperature ◽

Rolling Element Bearings ◽

Rolling Mills ◽

Rolling Element ◽

Nitrided Case ◽

Tooth Surfaces ◽

Made In

Aerosol lubrication has been most fully exploited in the field of rolling element bearings, notably for rolling mills but also in other machinery. The paper describes the application of an aerosol system to a power-transmission gearbox. The aerosol equipment was fitted to one gearbox of a 5-in-centres back-to-back rig so that either conventional sprays or the aerosol could be used. Involute test gears were made in through-hardened and nitrided case-hardened steels. Under aerosol lubrication the following points were noted: (1) because of the lower cooling capacity of the aerosol, operating temperatures were much higher than under spray lubrication; (2) the through-hardened gears failed by scuffing when their bulk temperature reached 90°C; (3) for the same temperature rise the nitrided gears transmitted 2·3 times the power, and operated at higher temperatures and powers without damage; and (4) no reduction could be detected in losses, suggesting that the losses attributable to churning of excess sprayed lubricant are balanced by an increase in tooth friction with aerosol. The experiments showed that power transmission gearing can be successfully lubricated by an aerosol, especially if the tooth surfaces are protected by nitriding.

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