Tribological Behavior of Nitrided Ductile Iron D6510 under Different Contacting Conditions

Two different nitriding techniques, named plasma nitriding and fluidized bed nitriding, were applied for surface modification of ductile cast iron NAAMS-D6510. Two test methods (i.e., Pin-on-disc tribotest and inclined sliding wear test) were used to generate different tribological contact-loading c...

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Autores principales:	Chen Zhao, Jingzeng Zhang, Xueyuan Nie
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2018
Materias:	nitriding inclined impact-sliding wear surface fatigue tribology Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/73eef8eae05a455d91beb7d790c5c608
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spelling	oai:doaj.org-article:73eef8eae05a455d91beb7d790c5c6082021-11-05T09:19:16ZTribological Behavior of Nitrided Ductile Iron D6510 under Different Contacting Conditions1881-219810.2474/trol.13.101https://doaj.org/article/73eef8eae05a455d91beb7d790c5c6082018-07-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/13/3/13_101/_pdf/-char/enhttps://doaj.org/toc/1881-2198Two different nitriding techniques, named plasma nitriding and fluidized bed nitriding, were applied for surface modification of ductile cast iron NAAMS-D6510. Two test methods (i.e., Pin-on-disc tribotest and inclined sliding wear test) were used to generate different tribological contact-loading conditions. While the pin-on-disc (POD) test had a vertical contact and relatively low stress applied on the mating surfaces, the inclined sliding wear test created a tilting contact with extremely high pressing pressure. The cross-sectional hardness and nitrogen concentration profiles along the case hardened layers were measured using a microhardness tester and energy dispersive spectroscope (EDS), respectively. Surface profilometry and scanning electron microscopy (SEM) were employed to measure and observe wear tracks after the tribological tests. The test results showed that the plasma nitrided sample was subjected to more severely abrasive/adhesive wear with numerous surface fatigue cracks, compared to the sample treated by fluidized bed nitriding, during the highly stressed inclined sliding wear test. This phenomenon was found to be attributed to their different hardness and nitrogen concentration profiles. A smaller hardness gradient between the compound layer and the case diffusion zone, and a thicker case hardened layer (provided from the fluidized bed nitriding in this study) could improve the wear resistance and the surface fatigue cracking resistance against the high contact loads. On contrast, less difference could be observed between the two different nitriding-treated samples during the POD tests. Moreover, the oxidation layer on the top of the compound layer of plasma nitrided sample may be beneficial for friction reduction under a low contact pressure condition like the POD sliding, but it would be soon removed and lost its advantage under the high contact pressure condition as for the inclined sliding case.Chen ZhaoJingzeng ZhangXueyuan NieJapanese Society of Tribologistsarticlenitridinginclined impact-sliding wearsurface fatiguetribologyPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 13, Iss 3, Pp 101-107 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	nitriding inclined impact-sliding wear surface fatigue tribology Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	nitriding inclined impact-sliding wear surface fatigue tribology Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Chen Zhao Jingzeng Zhang Xueyuan Nie Tribological Behavior of Nitrided Ductile Iron D6510 under Different Contacting Conditions
description	Two different nitriding techniques, named plasma nitriding and fluidized bed nitriding, were applied for surface modification of ductile cast iron NAAMS-D6510. Two test methods (i.e., Pin-on-disc tribotest and inclined sliding wear test) were used to generate different tribological contact-loading conditions. While the pin-on-disc (POD) test had a vertical contact and relatively low stress applied on the mating surfaces, the inclined sliding wear test created a tilting contact with extremely high pressing pressure. The cross-sectional hardness and nitrogen concentration profiles along the case hardened layers were measured using a microhardness tester and energy dispersive spectroscope (EDS), respectively. Surface profilometry and scanning electron microscopy (SEM) were employed to measure and observe wear tracks after the tribological tests. The test results showed that the plasma nitrided sample was subjected to more severely abrasive/adhesive wear with numerous surface fatigue cracks, compared to the sample treated by fluidized bed nitriding, during the highly stressed inclined sliding wear test. This phenomenon was found to be attributed to their different hardness and nitrogen concentration profiles. A smaller hardness gradient between the compound layer and the case diffusion zone, and a thicker case hardened layer (provided from the fluidized bed nitriding in this study) could improve the wear resistance and the surface fatigue cracking resistance against the high contact loads. On contrast, less difference could be observed between the two different nitriding-treated samples during the POD tests. Moreover, the oxidation layer on the top of the compound layer of plasma nitrided sample may be beneficial for friction reduction under a low contact pressure condition like the POD sliding, but it would be soon removed and lost its advantage under the high contact pressure condition as for the inclined sliding case.
format	article
author	Chen Zhao Jingzeng Zhang Xueyuan Nie
author_facet	Chen Zhao Jingzeng Zhang Xueyuan Nie
author_sort	Chen Zhao
title	Tribological Behavior of Nitrided Ductile Iron D6510 under Different Contacting Conditions
title_short	Tribological Behavior of Nitrided Ductile Iron D6510 under Different Contacting Conditions
title_full	Tribological Behavior of Nitrided Ductile Iron D6510 under Different Contacting Conditions
title_fullStr	Tribological Behavior of Nitrided Ductile Iron D6510 under Different Contacting Conditions
title_full_unstemmed	Tribological Behavior of Nitrided Ductile Iron D6510 under Different Contacting Conditions
title_sort	tribological behavior of nitrided ductile iron d6510 under different contacting conditions
publisher	Japanese Society of Tribologists
publishDate	2018
url	https://doaj.org/article/73eef8eae05a455d91beb7d790c5c608
work_keys_str_mv	AT chenzhao tribologicalbehaviorofnitridedductileirond6510underdifferentcontactingconditions AT jingzengzhang tribologicalbehaviorofnitridedductileirond6510underdifferentcontactingconditions AT xueyuannie tribologicalbehaviorofnitridedductileirond6510underdifferentcontactingconditions
_version_	1718444417022427136

Tribological Behavior of Nitrided Ductile Iron D6510 under Different Contacting Conditions

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