Evolution of Pro-eutectic Austenite in Semi-solid Hypoeutectic High Cr Cast Iron during Remelting

Zhou Rongfeng; Jiang Wenming; Jiang Yehua; Zhou Rong

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Evolution of Pro-eutectic Austenite in Semi-solid Hypoeutectic High Cr Cast Iron during Remelting
Issue 11, Pages: 849-852(2008)
Published： 2008 ，
DOI：

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[1]周荣锋,蒋文明,蒋业华,周荣.半固态亚共晶高铬铸铁重熔时先共晶相的演变[J].特种铸造及有色合金,2008(11):849-852+817.

Zhou Rongfeng, Jiang Wenming, Jiang Yehua, et al. Evolution of Pro-eutectic Austenite in Semi-solid Hypoeutectic High Cr Cast Iron during Remelting. [J]. Special Casting & Nonferrous Alloys (11):849-852(2008)
[1]周荣锋,蒋文明,蒋业华,周荣.半固态亚共晶高铬铸铁重熔时先共晶相的演变[J].特种铸造及有色合金,2008(11):849-852+817. DOI：

Zhou Rongfeng, Jiang Wenming, Jiang Yehua, et al. Evolution of Pro-eutectic Austenite in Semi-solid Hypoeutectic High Cr Cast Iron during Remelting. [J]. Special Casting & Nonferrous Alloys (11):849-852(2008) DOI：

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。

Abstract

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.