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 order to investigate the effects of Nb carbo-nitride precipitation conditions onabnormal grain growth behavior during high temperature carburizing, size of Nb carbo-nitrideprecipitates was controlled by precipitation treatment at 1173-1273K for 0.6-54ks, and thespecimens were quasi-carburized at 1323K. Abnormal grain growth was enhanced when the size ofNb precipitates was fine or coarse, so there is a suitable size range in Nb precipitates to suppressabnormal grain growth. The reason why abnormal grain growth was enhanced is the lack of pinningforce as the conventional theory proposed by Hillert or Gladman; however, it cannot be explainedby this theory that small precipitates promote abnormal grain growth. It is considered that Ostwaldripening rate of precipitates is also an important factor in controlling abnormal grain growth inaddition to the amount and size of precipitates and austenite grain size, which were parameters inthe Gladman‘s theory on abnormal grain growth behavior
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.4167.pdf
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