ISSN:
1013-9826
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
The Effect of die surface modification on the physiochemical melt-out phenomenon wasinvestigated. To measure the melt-out resistance more accurately, the mean depth measurementmethod after immersion in molten Al-alloy was proposed instead of the conventional weight changemethod. The validity of the mean depth method was verified by the comparison with the fieldservice test of core-pin. The several kind of nitriding, such as gas nitriding, ion nitriding, salt-bathnitriding and TNHT[removed info] process of PHILOS TECHNOLOGIES, INC were employed to changesurface condition and their effects on melt out resistance were examined by the immersion test andthe field service test of core pins. The melt-out depth was decreased with the nitriding treatmentsand in case of ion-nitrided specimen showed 2.8 times lower dissolution depth than as heat treatedspecimen. The white compound layer play a important role in the prevention of physiochemicalreaction, therefore, the TNHT process, which does not form the white layer, was less effective inthe view point of melt-out phenomenon only. The field test result using core-pins for producingautomobile engine parts showed similar tendency with the mean depth method and this implies thatthe mean depth method reflects the melt-out resistance of the modified surfaces effectively
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1181.pdf
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