北京科技大学学报
北京科技大學學報
북경과기대학학보
JOURNAL OF UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING
2014年
2期
177-182
,共6页
陈华%周荣锋%张玲%周荣
陳華%週榮鋒%張玲%週榮
진화%주영봉%장령%주영
铸铁%脉冲电流%凝固%组织%碳化物%晶粒细化%粒化
鑄鐵%脈遲電流%凝固%組織%碳化物%晶粒細化%粒化
주철%맥충전류%응고%조직%탄화물%정립세화%립화
cast iron%electric current pulse%solidification%microstructure%carbides%grain refinement%granulation
对过共晶高铬铸铁近液相线溶化后的凝固过程进行脉冲电流处理,研究了脉冲电流参数(脉冲电压和频率)对凝固组织的影响。发现脉冲频率和电压的增大都有助于过共晶高铬铸铁凝固组织中碳化物的细化和粒化。脉冲频率的增大促进大量细小颗粒状初生碳化物的析出,离异共晶现象变得更加明显,层片状共晶碳化物减少。脉冲电压的增加促进初生碳化物细化和粒化,片状共晶碳化物变短。过高的电压也促进离异共晶,导致更多的初生碳化物的形成。
對過共晶高鉻鑄鐵近液相線溶化後的凝固過程進行脈遲電流處理,研究瞭脈遲電流參數(脈遲電壓和頻率)對凝固組織的影響。髮現脈遲頻率和電壓的增大都有助于過共晶高鉻鑄鐵凝固組織中碳化物的細化和粒化。脈遲頻率的增大促進大量細小顆粒狀初生碳化物的析齣,離異共晶現象變得更加明顯,層片狀共晶碳化物減少。脈遲電壓的增加促進初生碳化物細化和粒化,片狀共晶碳化物變短。過高的電壓也促進離異共晶,導緻更多的初生碳化物的形成。
대과공정고락주철근액상선용화후적응고과정진행맥충전류처리,연구료맥충전류삼수(맥충전압화빈솔)대응고조직적영향。발현맥충빈솔화전압적증대도유조우과공정고락주철응고조직중탄화물적세화화립화。맥충빈솔적증대촉진대량세소과립상초생탄화물적석출,리이공정현상변득경가명현,층편상공정탄화물감소。맥충전압적증가촉진초생탄화물세화화립화,편상공정탄화물변단。과고적전압야촉진리이공정,도치경다적초생탄화물적형성。
Solidification of hypereutectic high-chromium cast iron samples near-liquidus melted was treated with electric current pulse ( ECP) . The effects of ECP parameters such as electric voltage and pulse frequency on the solidification microstructure were in-vestigated during the treatment. It is found that increasing the pulse frequency or electric voltage is helpful to carbide refinement and granulation in the cast iron. The increase of pulse frequency promotes the precipitating of a large number of fine granular primary car-bides and the occurrence of a divorced eutectic reaction, which lead to the decrease in number of lamellar eutectic carbides. The in-crease of electric voltage contributes to the primary carbides refining and granulating as well as the lamellar eutectic carbides shorten-ing. An excessive voltage value can also be favorable to the occurrence of a divorced eutectic reaction and the formation of additional primary carbides.