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Hypoeutectic high chromium white cast iron does not cause wear


hi-Crcastironweldingrodshavingthesamematerialasthatof thecastings, wereused, andthediameteroftheweldingrodwasof4mm, weldingcurrentwas150-160A. Thesurfacesoftherepairedcastingswerenondestructive lyinspected, nocrackwasdetected, andtheirhardnesswasneartothatofthebasemateria1. Themicrostructureshowedthattheweldingzonewasofarel ativelygoodmetallurgicaljunction. Keywords: highCrcastiron; surfacedefect; weldingrepair high chromium cast iron for high wear resistance and is widely used in various applications requiring high wear resistance. Although the high chromium cast iron castings have Received Date :2007 -05-16 revised date :2007-08-14 from Introduction: Wang Xiangming (1973 A), female, graduated from Shenyang Institute of casting professionals, engineers, mainly engaged in the wear-resistant materials and wear-resistant products work. Good casting properties, but also often in the casting process will be a variety of defects, such as trachoma, lack of meat, cracks, etc. This demanding castings, especially large-scale export of castings castings and is unacceptable. Without affecting the casting of use, and appropriate amount of the casting surface repair is necessary and possible. Stay away, so the carbide metal matrix not well protected. (3) Since the beginning of coarse grain austenite grains in the austenite before quenching process of insulation, which had saturated c, cr spread of precipitation is much slower than the eutectic austenite, is not easy to reach equilibrium solubility, resulting in subsequent air-cooling quenching process, only partially transformed into martensite, the presence of large amounts of residual austenite, the formation of low micro-hardness, abrasion resistance of this material disadvantage. References [1imb East school, Qi Xiao-bing, Yan Ping. Improve the high chromium cast iron from the VI performance research and production practice [J]. Modern Cast Iron, 2005, (2): 2. [2] Wan agriculture, Jian-Xin Dong,tory burch outlet, Xie Xishan. 15Cr Organization Department of the characteristics of high chromium cast iron thermodynamic analysis [J]. Casting, 2005, (4) :351-355. Modern Cast Iron 2007 / 5 [31oNDogma, JAHawk. ThreeTypesofweal-of26CrwhiteCastiron [J]. AFSTransactions ,1998,106:625-631. [4] JAHawk, RDWilson, JHTylezak, eta1. LaboratoryWearTestingofFerrousandComposites. AFSTransactions ,1998,106:656-658. [5] ZumGahrKarl-Heinz, DoaneDouglas. OptimizingFractureT called ghnessandAbrasionResistanceinWhiteCastIrons. MetallurgicalTransactions, 1980,11 A (4) :613-620. [6isInthideeh, PSriearoenehai,tory burch outlet, NSasagurl,mbt shoes ireland, eta1. BehaviorofHardnessandRetmnedAusteniteinHeatTreated HighChromiumCastironforAbrasiveWearResi ~ anee. AFSTransactions2004 ,112:899-910. [7] RLPattyn. HeatTreatmentofHigh-CrWhiteIrons. AFSTransactions1993 ,101:161-167. Capsule (Editor: Zhou Gen)
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