Tensile Behavior of Ti,Mo-added Low Carbon Steels with Interphase Precipitation
Tensile Behavior of Ti,Mo-added Low Carbon Steels with Interphase Precipitation
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DOI：
10.2355/isijinternational.54.212
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发表时间：
2014-01
影响因子：
1.8
通讯作者：
N. Kamikawa;Y. Abe;G. Miyamoto;Y. Funakawa;T. Furuhara
中科院分区：
文献类型：
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作者：
N. Kamikawa;Y. Abe;G. Miyamoto;Y. Funakawa;T. Furuhara
用加钛钢和加钛、加钼低碳钢研究了纳米碳化物弥散分布的铁素体钢的拉伸行为和组织性能关系。通过奥氏体化和700℃等温热处理，在加钛和加钛、加钼的钢中分别获得了含有非常细小的TiC和(Ti，Mo)C碳化物的多边形铁素体。在相同的等温保温条件下，加钛、加钼钢中碳化物的尺寸比加钛钢中的碳化物细小。拉伸试验结果表明，碳化物尺寸越小，强度越高。当假定纳米合金碳化物的析出强化以Ashby-Orowan机制为主时，基于结构的强度计算与实验结果吻合较好。研究还表明，较大的拉伸塑性与拉伸变形过程中回复率的提高有关，同时纳米颗粒促进了细小尺度上的二次滑移或交叉滑移。
Tensile behavior and structure-property relationship of ferritic steels with nano-sized carbide dispersion were invesigated using Ti-added steel and Ti,Mo-added low carbon steels. By austenitizing followed by isothermal heat treatment at 700°C, polygonal ferrites containing very fine carbides of TiC and (Ti,Mo)C were obtained in the Ti-added and the Ti,Mo-added steels, respectively. The size of such carbides was finer in the Ti,Mo-added steel than in the Ti-added steel at the same isothermal holding. The results of tensile tests for these samples showed that the strength is higher as the carbide size is smaller. The structure-based strength calculation led to a good agreement with the experiments, when it was assumed that the Ashby-Orowan mechanism is dominant for precipitation strengthening of nano-sized alloy carbides. It was also suggested that a relatively large tensile ductility is related to enhanced recovery during the tensile deformation, accompanied with promotion of secondary slips or cross slips in a finer scale due to the nano-sized particles.