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ML00027 - Apr.2017

Adhesive Wear of Spur Gear Rack

The non hardened surface of the SPUR RACK tooth presents a strong plastic deformation at the metal to metal contact region. There are also evidences of heat transformation due to the heat generated in the sliding.

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The non hardened surface of the SPUR RACK tooth presents a strong at the metal to metal contact region. There are also evidences of heat transformation due to the heat generated in the sliding.
M

Material

Medium Carbon Steel
  • UNS G10450
  • UNS G10550
Ds

Description

The spur gear/rack coupling has failed after a short time in service. The parts were not surface hardened.

C

Chemistry (% in weight)

Spur Rack

0.44C; 0.25Si; 0.72Mn; 0.022P; 0.017S; 0.10Cr; 0.08Ni; 0.02Mo.

Spur Gear

0.56C; 0.28Si; 0.65Mn; 0.019P; 0.009S; 0.21Cr; 0.13Ni; 0.05Mo.

Associated Images
The tooth contact surface of the SPUR RACK shows adhesive wear damage after a short time in service.
501
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - Aspect Before AnalysisDf - Metal to Metal Wear
The macrography of the transverse tooth section of the SPUR GEAR shows that the surface is not hardened by any process or treatment.
105
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - NItal Etched MacroDf - Non Hardened Surface
A detail of the macrography, by stereoscope, of the SPUR RACK shows strong plastic deformation at the contact surface.
88
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - NItal Etched MacroDf - Plastic Deformation
SPUR RACK ferritic perlitic microstructure in the center of the tooth.
89
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - Nital Etched Micrography by OMDf - Ferrite and Pearlite
SPUR RACK ferritic perlitic microstructure in the center of the tooth.
77
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - Nital Etched Micrography by OMDf - Ferrite and Pearlite
SPUR RACK ferritic perlitic microstructure in the center of the tooth.
67
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - Nital Etched Micrography by OMDf - Ferrite and Pearlite
SPUR RACK ferritic perlitic microstructure in the surface of the tooth, evidencing no surface hardening treatment.
54
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - Nital Etched Micrography by OMDf - Non Hardened Surface
The non hardened surface of the SPUR RACK tooth presents a strong plastic deformation at the metal to metal contact region.
51
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - Nital Etched Micrography by OMDf - Plastic Deformation
The non hardened surface of the SPUR RACK tooth presents a strong plastic deformation at the metal to metal contact region. There are also evidences of heat transformation due to the heat generated in the sliding.
49
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - Nital Etched Micrography by OMDf - Plastic Deformation
The non hardened surface of the SPUR RACK tooth presents a strong plastic deformation at the metal to metal contact region. There are also evidences of heat transformation due to the heat generated in the sliding.
44
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - Nital Etched Micrography by OMDf - Plastic Deformation
The tooth contact surface of the SPUR GEAR shows adhesive wear damage after a short time in service.
52
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - Aspect Before AnalysisDf - Metal to Metal Wear
The macrography of the transverse tooth section of the SPUR GEAR shows that the surface is not hardened by any process or treatment.
43
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - NItal Etched MacroDf - Non Hardened Surface
A detail of the macrography, by stereoscope, of the SPUR GEAR shows strong plastic deformation at the contact surface.
37
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - NItal Etched MacroDf - Plastic Deformation
SPUR GEAR ferritic perlitic microstructure in the center of the tooth. Predominantly perlitic.
34
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - Nital Etched Micrography by OMDf - Ferrite and Pearlite
SPUR GEAR ferritic perlitic microstructure in the center of the tooth. Predominantly perlitic.
32
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - Nital Etched Micrography by OMDf - Ferrite and Pearlite
SPUR GEAR ferritic perlitic microstructure in the center of the tooth. Predominantly perlitic.
32
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - Nital Etched Micrography by OMDf - Ferrite and Pearlite
SPUR GEAR ferritic perlitic microstructure in the surface of the tooth, evidencing no surface hardening treatment.
24
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - Nital Etched Micrography by OMDf - Non Hardened Surface
The non hardened surface of the SPUR GEAR tooth presents a strong plastic deformation at the metal to metal contact region.
26
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - Nital Etched Micrography by OMDf - Plastic Deformation
The non hardened surface of the SPUR GEAR tooth presents a strong plastic deformation at the metal to metal contact region.
25
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - Nital Etched Micrography by OMDf - Plastic Deformation
The non hardened surface of the SPUR GEAR tooth presents a strong plastic deformation at the metal to metal contact region.
24
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - Nital Etched Micrography by OMDf - Plastic Deformation