ISSN:
1013-9826
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:
The temperature, time and cooling rate are key factors in the hardening process using thegrinding heat instead of the high frequency induction heat source. Thus, this paper established themathematical model estimating the grind-hardening temperature, experimentally determined thegrinding temperature and the cooling rate of different grinding parameters for 48MnV microalloyedsteel using the conventional aluminum grinding wheel on a surface grinder, and investigated thegrind-hardening effects and the forming mechanism of grind-hardening layer. The results show thatthe estimating temperatures are comparatively close to the measuring ones and hence the model couldbe utilized to optimize the processing parameters, and the satisfactory grind-hardening temperatureand cooling rate could be achieved under the optimized processing parameters. The microstructure ofthe grind-hardening layer, the fine needlelike martensite in the entirely hardened zone, the martensiteand ferrite in the transitional region is similar to that acquired through the high frequency inductiontechnique. Especially, the average hardness of the entirely hardened zone is 740HV and the depth ofthe hardened layer is adjacent to 1.5mm, which indicate that the grind-hardening effects are veryexcellent. Different from the forming mechanism of the high frequency induction hardened layer,higher grind-hardening temperature is needed to compensate shorter time austenitization, and becauseof thermo-mechanical loading induced during grinding, from surface to inside, the morphology ofmartensite changes from fine to thicker, then to finer, other than from thick to finer
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.359-360.148.pdf
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