Nucleation of proeutectoid ferrite on complex precipitates in Austenite
Nucleation of proeutectoid ferrite on complex precipitates in Austenite
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DOI：
10.2355/isijinternational.43.1630
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发表时间：
2003-01-01
影响因子：
1.8
通讯作者：
Maki, T
中科院分区：
文献类型：
--
作者：
Furuhara, T;Yamaguchi, J;Maki, T
采用少量添加硫、钒和氮的Fe-2Mn-(0.13, 0.2)C（质量%）合金，研究了973 ~ 823 K温度下不同晶内夹杂物或析出物（MnS、VC和V(C，N)）对铁素体相变组织和动力学的影响。在Fe-2Mn-0.13C-50ppmS和Fe-2Mn-0.2C-470ppmS合金中，MnS颗粒大多在奥氏体中非共格，不能作为铁素体的有效形核位点。V的加入通过形成MnS+VC络合物沉淀，略微提高了MnS作为铁素体成核位的效力。V和N的加入极大地促进了铁素体在MnS+V（C，N）配合相上的晶内形核。认为(1)相间边界能平衡的优势和(2)氮的加入增加了V（C，N）析出物的分数，是促进MnS+V（C，N）配合析出物形成晶内铁素体的主要原因。
Effect of various intragranular inclusions or precipitates (MnS, VC and V(C,N)) on the microstructure and kinetics of intragranular ferrite transformation at the temperatures between 973 and 823 K was studied using various Fe-2Mn-(0.13, 0.2)C(mass%) alloys with the small addition of sulfur, vanadium, and nitrogen. In Fe-2Mn-0.13C-50ppmS and Fe-2Mn-0.2C-470ppmS alloys, MnS particles, mostly incoherent in austenite, do not act as effective nucleation sites of ferrite. V addition slightly improves the potency of MnS as ferrite nucleation site by forming MnS+VC complex precipitates. The addition of both V and N largely enhances the intragranular nucleation of ferrite idiomorph on the MnS+V(C,N) complex precipitate. It is considered that two factors, i.e., (1) the advantage in the balance of interphase boundary energy and (2) the increase in the fraction of V(C,N) precipitate by the addition of nitrogen, are mainly responsible for the promotion of intragranular ferrite formation on the MnS+V(C,N) complex precipitate.