摘要
对倾斜板法制备的亚共晶高铬铸铁半固态坯料在1300℃进行加热保温,借助Leica图像分析仪对保温过程中先共晶奥氏体的演变规律进行了研究。结果表明,晶粒球化和合并长大为保温过程中奥氏体形态演变的主要形式,两者交替发生,球化和合并长大所需的时间随着保温过程的进行而延长。同时,合并长大而恶化也随着保温过程的进行而越发显著。保温15.0min时,晶粒形状系数为0.86,平均等效直径为78.8μm;保温60.0min时,晶粒形状系数为0.70,平均等效直径为104.1μm。
Semi-solid billets of hypoeutectic high Cr cast iron prepared by the sloping plate method were reheated at 1300℃,and the evolution of pro-eutectic austenite in the semi-solid billets during reheating was observed by the Leica image analyzer.It is found that the spheroidization and the exacerbation due to mergence growth as two main forms for the evolution of austenite during holding have been generated by turns.With increasing in holding time,the spheroidization and the mergence growth time are increased,and the exacerbation due to mergence growth becomes more prominent also.The grain with shape factor of 0.86 and average equivalent diameter of 78.8 μm can be obtained with holding for 15 min,while the grain with shape factor of 0.7 and average equivalent diameter of 104.1 μm can be obtained with holding for 60 min.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2008年第11期849-852,共4页
Special Casting & Nonferrous Alloys
基金
高等学校博士学科点专项科研基金资助项目(20060674002)
云南省自然科学基金资助项目(2004E0018M
2005E0013Q)
云南省教育厅科学研究基金资助项目(5Y0662D)
昆明理工大学博士启动基金资助项目(2006-18)
关键词
倾斜板法
半固态
亚共晶高铬铸铁
先共晶奥氏体
Sloping Plate Method,Semi-solid,Hypoeutectic High Cr Cast Iron,Pro-eutectic Austenite
