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Control of Interphase Bowdlerizes in Steel

钢中相间变形的控制

基本信息

批准号：
10305050
负责人：
MAKI Tadashi
金额：
$ 15.94万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10305050/
关键词：
Steel Phase Transformation Precipitation Recryotellization In clusion Crystallography Interphase Bombay 折出

项目摘要

The (α+γ) and (α+θ) lamellar structures are heavily cold rolled and annealed to form the microduplex structures of which α grain size is less than 1 μm. α phase exhibits a subgrain structure in the (α+γ) case whereas α phase contains both of high angle and low angle boundaries in the (α+θ) case.VC in y.and s-Cu in α are both coherent to their matrices after solution treatment and aging. However, they become incoherent by losing the original orientation relationship after the recrystallization of matrix. After losing coherency, these precipitates coarsens vary rapidly.In the bcc precipitation from fcc matrix in a Ni-Cr alloy, regardless of the presence of near rational orientation relationship, precipitate (bcc)/matrix(fcc) interphase boundaries exhibit planar facets that often contain ledges and regularly aligned line defects. The boundary orientations of the planar facets correspond to the planes with the higher densities of coherent atoms by analyzing the geometrical near coincidence site model.Relation between the (α+θ) microstructure and the superplastic behavior in ultra-high carbon steels has been studied. The austenitizing, quenching and tempering treatment of pearlite structure produces an (α+θ) microduplex structure with high angle α grain boundaries. The specimen austenitized, quenched and tempered shows much larger superplastic elongation in the tensile tests at 973K than the as warm rolled specimens. This structure also exhibits the superior strength-ductility balance at room temperature.In the nucleation of intragranular ferrite idiomorphs on the incoherent MnS+V(C, N) complex precipitates in austenite, there is no specific orientation relationship between the ferrite and its austenite matrix indicating that the ferrite transformation texture could be randomized.

(α+γ)和(α+θ)层状结构经过重冷轧和退火形成α晶粒尺寸小于1μm的微双相结构。 (α+γ)情况下α相呈现亚晶结构，而(α+θ)情况下α相同时包含高角度和低角度晶界。固溶处理和时效后，y中的VC和α中的s-Cu均与其基体共格。然而，基体再结晶后，它们因失去原有的取向关系而变得不相干。失去共格性后，这些析出物会迅速粗化。在 Ni-Cr 合金中面心立方基体的 bcc 析出中，无论是否存在近乎理性的取向关系，析出物 (bcc)/基体 (fcc) 相间边界都表现出平面刻面，通常包含凸缘和规则排列的线缺陷。通过分析几何近重合位点模型，平面晶面的边界取向对应于相干原子密度较高的平面。研究了超高碳钢的(α+θ)显微组织与超塑性行为之间的关系。珠光体组织经奥氏体化、调质处理，产生具有大角度α晶界的(α+θ)微双相组织。奥氏体化、淬火和回火后的试样在973K拉伸试验中表现出比热轧试样大得多的超塑性伸长率。这种结构在室温下也表现出优异的强度-延展性平衡。在奥氏体中非共格MnS+V(C,N)复合析出物上晶内铁素体自晶形核过程中，铁素体与其奥氏体基体之间不存在特定的取向关系，表明铁素体转变织构可以是随机的。