Contact Fatigue Strength and Wear Characteristics of Plasma-Carburized Rollers

2006 ◽  
Vol 118 ◽  
pp. 503-508
Author(s):  
Takao Koide ◽  
Koji Tsubokura ◽  
Masayuki Nakatani ◽  
Kouitsu Miyachika ◽  
Masaki Yakabe ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Contact Fatigue ◽  
Fatigue Tests ◽  
Test Results ◽  
High Carbon ◽  
High Carbon Content ◽  
Wear Characteristics ◽  
Contact Fatigue Strength ◽  
Plasma Carburizing ◽  
Wear Tests

In the plasma-carburizing method, the detrimental grain boundary oxides in the surface of the materials and sooting problems are eliminated and the high carbon content near the surface is easily achieved. This paper describes a study on the contact fatigue strength and wear characteristics of plasma-carburized rollers. Test rollers made of super-carburizing steel MAC14 and conventional carburizing steel SCM415 were plasma-super-carburized under different carburizing conditions. The contact fatigue tests were carried out for these plasma-super-carburized rollers. The effects of case depths on the contact fatigue strength of these rollers were determined. The effect of shot-peening on the contact fatigue strength was also examined by carrying out contact fatigue tests for shot-peened rollers. The wear tests were also carried out and then the wear characteristics of test rollers were determined. These test results for plasma-super-carburized rollers were compared with the results for gas-super- or gas-eutectoid-carburized rollers.

Contact Fatigue Strength and Wear Characteristics of Plasma-Carburized Rollers

2006 ◽  
pp. 503-508
Author(s):  
Takao Koide ◽  
Koji Tsubokura ◽  
Masayuki Nakatani ◽  
Kouitsu Miyachika ◽  
Masaki Yakabe ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Contact Fatigue ◽  
Wear Characteristics ◽  
Contact Fatigue Strength

scholarly journals Investigation of the contact fatigue strength of high quality carburised steel

2021 ◽  
Vol 1129 (1) ◽  
pp. 012027
Author(s):  
S A Pakhomova ◽  
R S Fakhurtdinov ◽  
E Zhavoronkova ◽  
K Zinkovich
Keyword(s):  
Fatigue Strength ◽  
Contact Fatigue ◽  
High Quality ◽  
Contact Fatigue Strength

scholarly journals Influence of Crowning on Rolling Contact Fatigue Strength and Failure Mode of Steel Roller

2007 ◽  
Vol 73 (728) ◽  
pp. 1222-1229 ◽  
Author(s):  
Masahiro FUJII ◽  
Seesregdorj BAYASGALAN ◽  
Akira YOSHIDA ◽  
Kenji HAMADA ◽  
Kiyoji MINEGISHI ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Failure Mode ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Steel Roller ◽  
Contact Fatigue Strength

Failure Investigation of 1st Stage Buckets From Frame 3002, 10 MW Gas Turbine Unit

2011 ◽  
Author(s):  
Girish M. Shejale ◽  
David Ross
Keyword(s):  
Gas Turbine ◽  
Test Results ◽  
High Carbon ◽  
High Carbon Content ◽  
Metallurgical Investigation ◽  
Root Cause ◽  
Failure Investigation ◽  
Surface Failure ◽  
Grain Boundary Embrittlement ◽  
Industrial Gas Turbine

The 1st stage buckets in Frame 3002, 10 MW industrial gas turbine experienced premature failures. The buckets failed unexpectedly much earlier than the designed bucket life. Bucket material is Inconel 738, with platinum-aluminized coating on the surface. Failure investigation of the buckets was performed to know the root cause of the failure. The failure investigation primarily comprised of metallurgical investigation. The results of the metallurgical investigation were co-related with the unit operational history. This paper provides an overview of 1st stage buckets investigation. The metallurgical investigation performed concluded prime failure mechanism due to high carbon content of bucket material and improper heat treatment. The bucket coating was initially damaged during the first loading and fracture occurred due to grain boundary embrittlement in short span of service. The metallurgical tests performed included Visual inspection, Scanning Electron Microscopy (SEM), Energy Dispersive Analysis of X-ray (EDS), Chemical analysis, Tensile test and Hardness survey. The test results, discussions and conclusions are presented in this paper.

Effect of Lubricant Viscosity on Gearing Contact Fatigue Life

2012 ◽  
Vol 190-191 ◽  
pp. 1295-1301 ◽  
Author(s):  
Xiu Mei Qi ◽  
Chuang Kuan Gao ◽  
Zeng Qiang Zhang
Keyword(s):  
Fatigue Life ◽  
Contact Fatigue ◽  
Critical Value ◽  
Fatigue Tests ◽  
Numerical Calculations ◽  
Quantitative Relation ◽  
Test Results ◽  
Contact Fatigue Life ◽  
Lubricant Viscosity ◽  
Film Lubrication

The paper considers the effect of lubricant viscosity, ν, on the contact fatigue life, N, in gearing applications. More than 40 sets of the thermal non-Newtonian EHL numerical calculations and six sets of disc fatigue tests under the conditions ranging from the mixed to full film lubrication are used. The results show that for improving gearing fatigue life it is generally useful to increase lubricant viscosity. But it is not simply the case that the higher the lubricant viscosity, the better. When lubricant viscosity, ν, is less than a critical value, νcr, a quantitative relation of is seen in the test results; When ν > νcr, however, increasing lubricant viscosity is found to reduce the fatigue life. Based on this result, the paper raises questions concerning the accuracy of the lubrication factor recommended by ISO/6336:1996.

Sign in / Sign up

Export Citation Format

Share Document