ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
In case of the low carbon chromium steel that have widely been used for the carburizedgears or rolling bearings, the austenite grain coarsening may be occasionally occurred duringcarburizing. To restrain this phenomenon, most of hot forged parts have been given to an isothermalheat treatment or normalizing immediately after hot forging and/or prior to carburizing. Therefore,their production cost includes unexpected additional expenses caused by such a non-value addedprocess. To confirm the possibility of an energy saving, as well as attaining a superior fatigue life,in the production of automotive parts to be carburized, the austenite grain coarsening with themanufacturing process of the microalloyed steel, containing Nb and B as a grain refining elements,was investigated. The heat treatment characteristics and rolling contact fatigue behavior of thecarburized specimens with the isothermal heat treatment were also investigated. In spite of omittingthe isothermal heat treatment after hot forging, the abnormally coarse austenite grains were notfound out in the carburized specimens. However, the rolling contact fatigue life of the carburizedspecimens, in which the isothermal heat treatment was omitted, was shorter than that ofisothermally heat-treated specimens
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.544-545.151.pdf
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