A Grain Size Dependence of a Creep Deformation of Tungsten Containing High Chromium Ferriric Creep Resistant Steel( High Temperature Strength)
A Grain Size Dependence of a Creep Deformation of Tungsten Containing High Chromium Ferriric Creep Resistant Steel( High Temperature Strength)
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含钨高铬铁系抗蠕变钢（高温强度）蠕变变形的晶粒尺寸依赖性
DOI：
10.2472/jsms.52.124
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
M. Ohgami
中科院分区：
文献类型：
--
作者：
Y. Hasegawa;T. Muraki;M. Ohgami
实验确定了含钨11%铬铁素体钢高温持久强度和蠕变应变率的晶粒度关系。对同一铸锭进行相同的热处理，采用不同的锻造比，研究了回火马氏体组织的晶粒度对蠕变变形率的影响以及蠕变过程中的组织演变。细小的块状晶粒增加了晶间铁素体在蠕变过程中的形核位置，这是通过对断裂试件制备的薄片的透射电子显微镜观察到的。用Terada等人提出的修正的“核-幔模型”解释了晶界组织的回复，该模型假设铁素体组织蠕变过程中的壳层宽度增加相当于奥氏体组织的晶界滑移或晶界扩散机制。
Grain size dependence of creep rupture strength and creep strain rate was experimentally decided for tungsten containing 11% chromium ferritic steels at elevated temperatures. A different forging ratio for the same cast ingot following the same heat treatment extracted the grain size effect of temepered martensitic microstructure on a creep deformation rate and a microstructure evolution during the creep. Fine block grain increased the nucleation site of intergranular ferrite during the creep which was observed through Transmission Electron Microscope for thin foils prepared from ruptured specimens. Grain boundary microstructure recovery was explained by modified “core-mantle-model”, proposed by Terada et al., assuming the mantle width increase during the creep deformation in ferritic microstructure equivalent to a grain boundary slip or a grain boundary diffusion mechanism for austenitic microstructure.