Precipitation and Hetero-nucleation Effect of V(C,N)in V-Microalloyed Steel

武汉理工大学学报-材料科学版(英文版), 2008, 23(6): 844-849. doi: 10.1007/s11595-007-6844-x

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

1.Advanced Forming Technology Institute,Jiangsu University,Zhenjiang 212013,China

2.Advanced Forming Technology Institute,Jiangsu University,Zhenjiang 212013,China

3.School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China

4.School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China

基金项目: 江苏大学自然科学基金重点项目(04KJA430021) 国家自然科学基金(50775102)

Precipitation and Hetero-nucleation Effect of V(C,N)in V-Microalloyed Steel

LI Xineheng ^1, , ZHAO Liangyi ^2, , WANG Xinyu ^3, , ZHAO Yutao ^4,

1.Advanced Forming Technology Institute,Jiangsu University,Zhenjiang 212013,China

2.Advanced Forming Technology Institute,Jiangsu University,Zhenjiang 212013,China

3.School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China

4.School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China

Keywords： V(C,N)

The precipitation behavior of V(C,N) in steels microalloyed with vanadium was researched using a thermal simulator during single-pass deformation at 800-750 ℃.The V(C,N) precipitates and its nucleation effect on ferrite were investigated by TEM and EDS.The experimental results show that there are two remarkable heterogeneous nucleation effects of V(C,N) particles precipitated before y→αphase change:primary reason is that high coherency between V(C,N) and ferrite promotes V(C,N) to become a nucleating center of intragranular ferrite;secondary reason is that the coarsening of V(C,N) causes locally solute-poor region in austenite,thus expedites the nucleation of intragranular ferrites further.Furthermore,the relationship between the size and shape of V(C,N)was studied,and identification method was provided for distinguishing interphase precipitation and general precipitation to avoid erroneous judgment and misguide.

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Precipitation and Hetero-nucleation Effect of V(C,N)in V-Microalloyed Steel

参考文献