The Character of Observed Porosity and Its Possible Effects on Rolling Contact Fatigue Life of M-50 Steel PDF Download
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Author: J. L. Perry
Publisher:
ISBN:
Category :
Languages : en
Pages : 72
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Book Description
This thesis studied a warm-rolling of AISI M-50 steel at 750 C (1382 F). Samples of both warm-rolled and as-received (spheroidized annealed) M-50 were austenitized at 1036 C (1897 F) for various times and subsequently tempered. The heat treated samples were subjected to rolling contact fatigue (RCF) testing. In all cases prior warm-rolling degraded the RCF life at both the L(10) and L(50) levels. Scanning electron microscopy was used to examine the microstructure of the as-received and warm-rolled material between 4000X and 10,000X magnification. It is thought that the increase in the void diameters accounts for the decrease in RCF performance of warm-rolled M-50. The degraded RCF performance is due to both the increase in mean void diameter and the increase in larger sized voids that accompany warm rolling. A qualitative model was developed to account for the origin of voids in as-received material and for the increase in void diameter in warm-rolled material. Keywords: Thermomechanical processing, Residual carbides, Porosity, Void Size Distribution, Bearings, Void Origin Model.
Author: J. L. Perry
Publisher:
ISBN:
Category :
Languages : en
Pages : 72
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Book Description
This thesis studied a warm-rolling of AISI M-50 steel at 750 C (1382 F). Samples of both warm-rolled and as-received (spheroidized annealed) M-50 were austenitized at 1036 C (1897 F) for various times and subsequently tempered. The heat treated samples were subjected to rolling contact fatigue (RCF) testing. In all cases prior warm-rolling degraded the RCF life at both the L(10) and L(50) levels. Scanning electron microscopy was used to examine the microstructure of the as-received and warm-rolled material between 4000X and 10,000X magnification. It is thought that the increase in the void diameters accounts for the decrease in RCF performance of warm-rolled M-50. The degraded RCF performance is due to both the increase in mean void diameter and the increase in larger sized voids that accompany warm rolling. A qualitative model was developed to account for the origin of voids in as-received material and for the increase in void diameter in warm-rolled material. Keywords: Thermomechanical processing, Residual carbides, Porosity, Void Size Distribution, Bearings, Void Origin Model.
Author: Wade H. Shafer
Publisher: Springer Science & Business Media
ISBN: 1461573912
Category : Science
Languages : en
Pages : 386
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Book Description
Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thougtit that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 31 (thesis year 1986) a total of 11 ,480 theses titles trom 24 Canadian and 182 United States universities. We are sure that this broader base tor these titles reported will greatly enhance the value ot this important annual reterence work. While Volume 31 reports theses submitted in 1986, on occasion, certain univer sities do re port theses submitted in previousyears but not reported at the time.
Author:
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Category : Aeronautics
Languages : en
Pages : 272
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Author:
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ISBN:
Category : Metallurgy
Languages : en
Pages : 1302
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Author: R. A. Baughman
Publisher:
ISBN:
Category :
Languages : en
Pages : 11
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Book Description
The effect of hardness, surface finish and grain size upon the compressive rolling contact fatigue strength of M-50 bearing steel has been studied. Considerable testing on the RC Rig and statistical treatment methods have been included. A mathematical expression relating these variables to life expectancy is presented and the optimization of these variables is discussed. It is shown that bearing fatigue of M50 increases by increasing hardness, decreasing surface, and increasing grain size. The optimum life identified occurs at Rc 64 hardness, 1.5 RMS surface finish, and a grain size of ASTM 2.
Author:
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Category : Government reports announcements & index
Languages : en
Pages : 1016
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Author:
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ISBN:
Category : Alloys
Languages : en
Pages : 944
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Author: J. J. C. Hoo
Publisher: ASTM International
ISBN:
Category :
Languages : en
Pages : 420
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Author: Thomas L. Carter
Publisher:
ISBN:
Category : Materials
Languages : en
Pages : 40
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Book Description
Author: Seon Ho Lee
Publisher:
ISBN:
Category : Austempering
Languages : en
Pages : 23
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Book Description
Conventional studies of bearing steels and heat treatments have dealt with quenching and tempering (Q/T) in 52100 steel. Despite all the research, however, the latest trend in automotive parts is having a long life span, high quality, and reliability. Car components must be developed to meet the above car manufacturer's requirements. The increase in service life of wheel bearings, by improving the rolling contact fatigue (RCF) life of bearing steels, was investigated. Bearing steels for wheel units are commonly treated by through or case hardening to strengthen the steel. This study suggests a new trial to increase the strength of bearing steels by austempering in phases after general heat treatments such as Q/T or carburizing. This special heat treatment was also designed to produce fine austenite grains to increase the fatigue strength. The experiment is carried on with conventional 5120 and 52100 bearing steels, with the former applied to carburizing, while the latter is applied to Q/T. Austempering was then additionally conducted in each steel to investigate the effect of fine austenite generation in each bearing steel. Aside from the aforementioned trial, this study also focuses on the microstructural behavior taking place after austempering. In this study, a newly designed heat treatment concept is introduced and the probabilistic property of fatigue life was investigated using the RCF life test and the L10 approach. The effect of microstructural behavior on these properties is also analyzed using scanning electron microscopy (SEM)/energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM), and X-ray diffraction (XRD). In addition, the dilatometer is used to determine the bainite transformation temperature point in both cases.
