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Technical Paper

Bending Fatigue Behavior of Carburized Gear Steels: Four-Point Bend Test Development and Evaluation

1996-02-01
960977
The ability to evaluate the bending fatigue behavior of carburized low alloy steels in a laboratory and relate these measurements to performance of high contact ratio helical gears is important to the design and development of transmissions. Typical methods of evaluating bending fatigue performance of carburized gear steels do not directly represent helical planetary gears because they lack the geometric and loading conditions of planetary pinions. The purpose of this study is twofold; 1) development of a lab fatigue test to represent the fatigue performance of planetary pinion gears tested in a dynamometer and 2) evaluation of the influence of alloy content on bending fatigue performance of two steel alloys. The steels under evaluation were modified 8620M and 4615M alloys machined into bend bars with a notch representing a gear root and carburized to a case depth of approximately 0.35 mm (using the same carburizing cycle as the planetary pinion gears).
Technical Paper

Alloy Steel Bar and Tubing Developments

1987-04-01
870789
Today's marketplace and the increased requirements of material specifications have caused modern steelmakers to improve their current products and develop new ones. In doing so, the processes and products have been optimized with respect to properties, performance, quality, and cost. Several of these processes/products and the benefits they provide are described. Developments/improvements in steelmaking, internal quality, chemistry/hardenability control, machinability, cost effective alloying, and similar areas of interest for both bar and tubular products are included.
Technical Paper

A Method for Bearing Damage Analysis

1982-02-01
820634
A method for the analysis of a damaged bearing is described. An emphasis is placed on obtaining complete and accurate application information; conducting a thorough visual examination; making physical measurements as necessary; and conducting metallurgical tests. The method has been used for tapered roller bearings as well as a variety of other components of various steel types and processing histories.
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