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Monday, July 13, 2020 | History

2 edition of Fatigue durability of carburized steel found in the catalog.

Fatigue durability of carburized steel

American Society for Metals.

Fatigue durability of carburized steel

a series of educational lectures.

by American Society for Metals.

  • 116 Want to read
  • 2 Currently reading

Published by American Society for Metals .
Written in English


ID Numbers
Open LibraryOL20071742M

The fatigue limit increases from ca. MPa for the base material to MPa for the tensile carburized specimens. Detailed measurements display that the carburized layer in a carburized specimen possesses high compressive residual stresses, which arises the fatigue performance of the carburized steel. High cycle fatigue properties of gas-carburized steel were assessed to compare with those of steel which is widely used as a carburizing steel. Fatigue limit was evaluated associated with microstructure, case depth, and distribution of retained austenite and compressive residual stress near the surface. Test results indicated that the reheat quenching method of and steels.

Both axial and bend specimens were carburized and subjected to constant amplitude, strain-controlled fatigue tests. A discontinuity in the resulting strain-life curves, representing a shift from surface to subsurface crack initiation, is predictable from comparison .   The topic of fatigue and durability is an important topic especially for aeronautical structures that are designed to be operated for several decades while assuring the structural integrity. Based upon the discussion in chapter 2, one can imagine that the material properties will change over time due to ageing of the material.

  This paper presents the test results of a durability study on a novel basalt fiber-reinforced polymer (BFRP) bar-anchor system. The BFRP bars were exposed to saline and alkaline solutions for 10 weeks before being anchored and tested under static and fatigue loading. AbstractThe effect of steel cleanness, core hardenability, and microstructure after carburising on bending fatigue strength is described for the standard steel grade SS Examination of the fatigue fracture surfaces revealed that initiation had occurred at the surface where an internally oxidised layer was present. Differences in the inclusion content were not a major cause of fatigue failure.


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Fatigue durability of carburized steel by American Society for Metals. Download PDF EPUB FB2

"FATIGUE durability of carburized steels is affected by many variables among which are load stress, residual stress, physical and metallurgical properties of the case and core, and surface condition as affected by metallurgical : J.

Et All Bidwell. Fatigue durability of carburized steel. Cleveland, American Society for Metals [] (OCoLC) Document Type: Book: All Authors / Contributors: J B Bidwell; General Motors Corporation.; American Society for Metals. Bending fatigue of carburized steel components is a result of cyclic mechanical loading.

This article reviews the alloying and processing factors that influence the microstructures and bending fatigue performance of carburized steels. carbon steel case and a low-carbon steel core. When this steel composite is quenched to martensite and tempered, the high hardness and strength of the case microstructure, combined with the favorable case compressive residual stresses developed during quenching, produce a high resistance to fatigue.

The failure of a spiral bevel gear from the transmission of a helicopter was discovered when the transmission was removed after an in-flight incident. Two adjacent teeth from the carburized AISI steel gear were found to have undergone fatigue failure.

Internal initiation occurred in a region depleted of chromium and nickel. significant variations in the fatigue behavior observed in laboratory samples (2,3).

The processing histories included an as-gas -carburized set as a baseline, a set shot -peened after gas carburizing, a reheated set to refine the case grain size, and a set processed by vacuum carburizing to minimize intergranular oxidation at the surface.

The characteristic fatigue behavior of carburized and quenched steel with internal oxides and non-martensitic microstructure near the surface was presented through rotating bending fatigue test. The S-N diagram revealed two knees and the specimens continued to fail over 10 7 stress cycles.

The degree of improvement depended on the depth (thickness) of the hardened layer and on the microstructure of a carburized steel. It was found that the fatigue strength of low alloy steel with.

Carburized specimens of AISI steel were tested in repeated bending at stress levels ranging from high-stress, low-cycle to low-stress, high-cycle, and the corresponding stress-life curve was determined.

Considerable scanning electron microscopy was performed on fracture surfaces of failed specimens. The carburized steel will contain the compressive residual stress, thus resulting in improvement of fatigue resistance, and encumbering crack initiations.

Combination of the hardness values decreasing from the surface to the core of the shaft (see Fig. 3) and the favorable compressive stress developed by the interaction between the carburized layer and the softer core is desirable for improving surface. Residual Stress and Fatigue Strength of Carburized Steels and Gears.

The residual stress of carburized and hardened gears have profound influence on durability. Residual stress of carburized and quenched steel varies with steel hardenability, carburizing processes, quench methods and case depth.

The residual stress of carburized steels is further increased by post by: 5. The bending fatigue strength of 17CrNi steel subjected to vacuum carburizing with high pressure gas hardening has been measured using a novel high-frequency technique.

The test records the changes in resonance and consists of observing resonance frequency changes in a vibrating system with a single degree of freedom as a result of the forming of a fatigue crack.

This volume addresses the specific subject of fatigue, a subject not familiar to many engineers, but still relevant for proper and good design of numerous steel structures. It explains all issues related to the subject: Basis of fatigue design, reliability and various verification formats, determination of stresses and stress ranges, fatigue.

The superfinished gears were subjected to surface fatigue testing at GPa (ksi) Hertz contact stress, and the data were compared with the NASA Glenn gear fatigue data base.

The lives of gears with superfinished teeth were about four times greater compared with the lives of gears with ground teeth but with otherwise similar quality.

THE FATIGUE PROPERTIES OF LOW ALLOY AND CARBON STRUCTURAL STEElS by J. Eo Stallmeyer and Ro M. Morison Approved by Wo Ho Munse A Technical Report for the Engineering Foundation, Chicago Bridge and Iron Company) American Iron an~Steel Institute, and the Welding-Research Council Fatigue Committee Department of Civil Engineering.

case carbon content exceed %, or perhaps % in a few situations. The depth of the carburized case is mainly a function of the carburizing time. The earliest carburizing process was called pack carburizing, dating from antiq-uity. Basically, the steel part was en-cased in a bed of charcoal (the carbon source), heated to the desired temper.

ON FATIGUE DESIGN CURVES OF CARBON AND LOW-ALLOY STEELS by 0. Chopra and W. Shack Abstract The ASME Boiler and Pressure Vessel Code provides rules for the construction of nuclear power plant components. Figures 1 through I of Appendix I to Section III of the Code specify fatigue design curves for structural materials.

The axial fatigue curve is more linear than the four-point bending fatigue curve where the strain amplitude at both 1×10 4 and 1×10 5 cycles is lower in four-point bending fatigue than in axial fatigue. This blog reviewed the axial and four-point bending fatigue of SAE steel in simulated carburized core condition.

Carburizing treatments are of prime importance to developing fatigue and wear characteristics of steels. It is also well known that the relative case depth, which considers the size of components.

You can write a book review and share your experiences. Other readers will always be interested in your opinion of the books you've read. Whether you've loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them.

this polishing during running improved the surface durability of the gear. None of the tests conducted in the study, however, in-cluded a case-carburized pinion mated with a case-carburized gear. A second investigation by Nakasuji et al. @7,8# studied the pos-sibility of improving gear fatigue lives by electrolytically polish-ing the teeth.

Carburized Steel Core Strength and Fatigue Life as a Function of Hardness Posted on Ma by Steel Market Development Institute In this article we will examine the strength and fatigue life found in the core of a part when using typical low carbon alloy carburizing steels.Fig. Comparison of steel and aluminum fatigue beha-vior.

Source: Ref 2 All test results from one laboratory All specimens 0 to 2 micro-in. finish Fatigue limit, (ksi) Fatigue limit, (MPa) 90 80 70 60 20 25 30 35 40 45 Rockwell C hardness Quenched and tempered steels