A Mixed-control Mechanism Model of Proeutectoid Ferrite Growth under Non-equilibrium Interface Condition in Fe-C Alloys

材料科学技术（英文）, 2004, 20(5): 561-566.

^1, , ^2, , ^3, , ^4,

1.Department of Plasticity Technology, Shanghai Jiao Tong University, Shanghai,200030,China

2.Department of Plasticity Technology, Shanghai Jiao Tong University, Shanghai,200030,China

3.Department of Materials Engineering, Shanghai Institute of Technology, Shanghai,200233, China

4.School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai,200030, China

基金项目: the Emphasized Item of Development Funds of Science and Technology of Shanghai City, China(03H201) 国家自然科学基金(50075053)

A Mixed-control Mechanism Model of Proeutectoid Ferrite Growth under Non-equilibrium Interface Condition in Fe-C Alloys

Keywords： Proeutectoid ferrite precipitation

By combining the α/γ interface migration and the carbon diffusion at the interface in Fe-C alloys, a mathematical model is constructed to describe the mixed-control mechanism for proeutectoid ferrite formation from austenite. In this model, the α/γ interface is treated as non-equilibrium interface, i.e., the carbon concentration of austenite at γ/α interface is obtained through theoretical calculation, instead of that assumed as the local equilibrium concentration.For isothermal precipitation of ferrite in Fe-C alloys, the calculated results show that the rate of interface migration decreases monotonically during the whole process, while the rate of carbon diffusion from γ/α interface into austenite increases to a peak value and then decreases. The process of ferrite growth may be considered as composed of three stages: the period of rapid growth, slow growth and finishing stage. The results also show that the carbon concentration of austenite at γ/α interface could not reach the thermodynamic equilibrium value even at the last stage of ferrite growth.

参考文献

[1]	RAV,ermeer .[J].Acta Metallurgica Et Materialia,1990,38:2461.
[2]	MEnomoto .[J].ISIJ International,1992,32:297.
[3]	RCReed;HKDHBhadeshia .[J].Materials Science and Technology,1992,8:421.
[4]	MOnink;FDTichelaar;CMBrakman;EJMittemeijer,,S van der Zwaag .[J].Journal of Materials Science,1995,30:6223.
[5]	GPKrielaart;JSietsma;S van der Zwaag .[J].Materials Science and Engineering,1997,237:216.
[6]	G. P. Krielaart;S. van der Zwaag .Kinetics of γ-α phase transformation in Fe-Mn alloys containing low manganese[J].Materials Science and Technology: MST: A publication of the Institute of Metals,1998(1):10-18.
[7]	GPKrielaart;S van der Zwaag .[J].Materials Science and Engineering,1998,246:104.
[8]	TAKop;YVan Leeuwen;J Sietsma;S van der Zwaag .[J].ISIJ International,2000,7:713.
[9]	JJWits;TAKop;YVan Leeuwen;J Sietsma,S van der Zwaag .[J].Materials Science and Engineering,2000,283:234.
[10]	TYHsu.The Theory of Phase Transformation[M].北京:科学出版社,2000:66.
[11]	PGShewmon.Diffusion in Solids[M].McGraw-Hill Book Co,New York,1963:40.
[12]	JCrank.The Mathematics of Diffusion 2nd edn[M].Oxford University Press London,1975:11.
[13]	SJRothman.[A].ASNowick,Academic Press,Orl,o,1984
[14]	CZener .[J].Journal of Applied Physics,1949,20:950.

上一张下一张

计量

下载量()
访问量()

作者相关

在本站搜索
在百度学术搜索
在万方数据库搜索
在CNKI搜索

文章评分

您的评分：
1

0%
2

0%
3

0%
4

0%
5

0%

材料期刊网

A Mixed-control Mechanism Model of Proeutectoid Ferrite Growth under Non-equilibrium Interface Condition in Fe-C Alloys

参考文献