Optimization of compound layer thickness for wear resistance of nitrocarburized H11 steels

Krishnaraj, N.; Srinivasan, P. Bala; Iyer, K. J. L.; Sundaresan, S.

doi:10.1016/s0043-1648(97)00276-7

Cited by 42 publications

(17 citation statements)

References 9 publications

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“…Higher surface hardness values and big depth are obtained at these conditions. These results are in good accordance with those of Krishnaraj et al [25] who studied the mechanical properties of plasma nitrided steel. Priest and al.…”

Section: Microstructure Of Nitrided Samplessupporting

confidence: 92%

TRIBOLOGICAL BEHAVIOR OF 42CrMo4 STEEL NITRIDED BY PLASMA

Saied¹,

Chala²,

Belahssen³

et al. 2015

Acta Metall Slovaca

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This paper presents wear behavior of the plasma nitrided 42CrMo4 steel. This steel is used in mechanical industry; it has been assessed by evaluating tribological properties and surface hardness by using a pin-on-disk wear machine and microhardness tester. Experimental results showed that the nitrides ε-Fe 2-3 N and γ'-Fe 4 N present in the compound layer increase the microhardness. It is found that plasma nitriding improves the wear rate and the presence of a hard and brittle compound layer on the surface causes an increase in wear of the specimen surface.

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Section: Microstructure Of Nitrided Samplessupporting

confidence: 92%

TRIBOLOGICAL BEHAVIOR OF 42CrMo4 STEEL NITRIDED BY PLASMA

Saied¹,

Chala²,

Belahssen³

et al. 2015

Acta Metall Slovaca

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“…Note that the absence of porosity results in decreased brittleness of the compound layer [5][6][7][8][9][10]. Thus these characteristics of nitrided blocks do not differ essentially to each other but at compound layer removal different density of porosity was found at both groups of blocks that resulted in different wear rates.…”

Section: Initial Microstructures and Xrd Of Samples And Applied Indusmentioning

confidence: 99%

“…Spots with the partially removed fragments as shown in Figure 5b revealed that the porosity in the compound layer is responsible for its degradation, since on the removed surfaces of block 2. Note that from the scientific literature [5][6][7][8][9][10] it is well known that porosity is a consequence of inappropriate nitriding parameters. Furthermore occurrence of the surface microand macro-cracking as well as the spots where comparatively small fragments were removed was observed.…”

Section: Wear Progress On Nitrided Blocks At Lower Contact Pressurementioning

confidence: 99%

“…Microstructure after nitriding as well as die design should be in each application adapted to actual loads that prevail on the die. It well known that nitrided microstructure of dies aimed for Al hot extrusion is very important at prolongation of die life [5][6][7][8][9][10]. Study of wear of tribological pair of soft and heated metal in contact with hard counter body is very demanding.…”

Section: Introductionmentioning

confidence: 99%

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Wear progress of nitrided microstructures in tribological simulation of aluminium hot extrusion

Terčelj¹,

Peruš²,

Kugler³

2011

Surface Effects and Contact Mechanics X

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The study of wear of a tribological pair of soft and heated metals in contact with a hard counter body is very demanding. So far, less attention has been devoted to this problem and thus progress in this field is needed. In Al hot extrusion also the mentioned tribological system prevails but it is also supposed that various contact pressures between extruded Al die bearing surfaces takes place. In order to explain wear behaviour on die bearing surfaces wear tests of nitrided surfaces at low, medium and higher contact pressures using block on cylinder test equipment were carried out.

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“…7 (c)). The main reason for this behaviour could be the increased surface roughness at these spots (the layer has irregular thickness), with a consequent increase in the surface (about 100%) (14) , making it more appropriate for a chemical reaction with the hot aluminium.…”

Section: Wear Testing Of Nitrided Samplesmentioning

confidence: 99%

The Microstructures and Wear Resistance of Gas-Nitrided and Ionically Nitrided AISI H10 Dies with Narrow Gaps Designed for the Hot Extrusion of Aluminium

Terčelj

Smolej

Vecko-Pirtovsek

et al. 2006

JSME Int. J., Ser. C

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Dies made from AISI H10 die steel with narrow and deep gaps were nitrided by various manufacturers of equipment for ionic and gas nitriding. The manufacturers chose the optimum nitriding parameters themselves, based on their experience with extrusion dies. The resulting microstructures showed differences in terms of the presence or absence of a compound layer, the thickness of the layer andv its ε/γ phase ratio (XRD), the nitriding depth and the microhardness values. The obtained nitriding depths, the maximum microhardness of the nitrided surfaces and the ε/γ phase ratio were usually similar for dies from the same manufacturer, while the dies from different manufacturers tended to have different values. Samples with various nitrided microstructures were laboratory tested for wear resistance with a newly designed test rig that provided a simulation of the tribological conditions for the hot extrusion of aluminium. The results of the study indicate that dies with a greater nitriding depth in combination with a compound layer composed primarily of just one phase (in our case the ε phase) exhibited better wear resistance than those dies with a small nitriding depth and with an equal share of the two phases.

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Optimization of compound layer thickness for wear resistance of nitrocarburized H11 steels

Cited by 42 publications

References 9 publications

TRIBOLOGICAL BEHAVIOR OF 42CrMo4 STEEL NITRIDED BY PLASMA

TRIBOLOGICAL BEHAVIOR OF 42CrMo4 STEEL NITRIDED BY PLASMA

Wear progress of nitrided microstructures in tribological simulation of aluminium hot extrusion

The Microstructures and Wear Resistance of Gas-Nitrided and Ionically Nitrided AISI H10 Dies with Narrow Gaps Designed for the Hot Extrusion of Aluminium

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