Chilled cast iron camshaft chilling layer porosity defects and Countermeasures
46005, China; 4. JindingCamshaftCastingCo. Ltd. , Pixian611732, China) Abstract: TheinfluenceofQPQcompositesaltbathtreatingonwearre sistanceofalloyedgrayironwasinvestigated. Atfirstthealloyedgrayironspecimenswerepretreatedwi thdifferentnormalizingandtemperingprocessesinorder toobtaindifferentcontentofferrite. thentreatedintheQPQcompositesaltbathaccordingtothe followingprocess: nitridedat580 ℃ for3h,
mac cosmetics wholesale, thenoxidatedat370 ℃ for30min. Microstructureexaminationshowedthat. afterhavingbeentreatedinQPQcompositesaltbath, thepenetratedlayerofthespecimenconsistedmainlyofFe rNandFe304; thicknessofthepenetratedlayerincreasedwithincreasi ngoftheferritecontent. Thewearresistancetestexhibitedthatthewearresistanc eofthespecimenswhichhadbeentreatedintheQPQcomposit esaltbathwereobviouslyhigherthanthatofthespecimens whichhadbeenquenchedandtemperatureatlowtemperature ; andthewearresistanceofalloyedgrayironspecimenshavi ngoxidatedlayerwasfurtherhigherthanthatofspecimens havingonlynitridedlayer. Keywords: QPQcompositesaltbathtreating; alloyedgrayiron; nitridedlayer; oxidatedlayer; wearresistance Received date :2007 -10-18 revised date :2008 -02-03 Author: Shen Paul (1945.2 A), male, Sichuan University Professor, engaged in metal surface treatment and research in international academic journals published 200 articles. The main failure mode is the camshaft cam wear. In order to improve the life of cast camshaft, commonly used in domestic and foreign materials scientists cam induction hardening, plasma nitriding, sulfur and nitrogen-based [51,
p90x workout schedule, cam tungsten TIG remelting [61, laser surface hardening [7] and other surface reason, according to the porosity of the visual characteristics, distribution, waste vent rate of increase,
tory burch outlet, the proportion of ingredients combined with the actual production, process methods, sources of raw materials, to determine the defect types, master and good application of technology investigative techniques, in practice, continue to accumulate experiences, lessons learned and improve the casting process,
ghd planchas, porosity losses caused by defects will be reduced to a minimum. Modern Cast Iron 2008 / 3 References Casting defects and countermeasures Manual [M]. Beijing: Mechanical Industry Press. 1996:75-131. [21 Yuandong Zhou, aluminum skin on the piston ring casting porosity of the formation of [J1. Combustion engine parts, 2001, (2) :16-17. He (Editor: Yang Yang, E-mail: xdzt_yy@fawfc.COB)
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