Grain Boundary Related Deformation in ODS Ferritic Steel during Creep Test
Grain Boundary Related Deformation in ODS Ferritic Steel during Creep Test
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DOI：
10.2320/matertrans.m2012143
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发表时间：
2012-10
影响因子：
1.2
通讯作者：
Yoshito Sugino;S. Ukai;B. Leng;N. Oono;S. Hayashi;T. Kaito;S. Ohtsuka
中科院分区：
文献类型：
--
作者：
Yoshito Sugino;S. Ukai;B. Leng;N. Oono;S. Hayashi;T. Kaito;S. Ohtsuka
氧化物弥散强化（ODS）铁素体钢是一种先进的耐热钢，其高温强度不仅取决于穿晶变形，还取决于沿晶变形。本研究的目的是阐明晶界变形过程中使用15 CrODS铁素体钢。从800°C时的应力-应变速率双对数图可以看出，应力指数n大于10，而真实的应变速率比单纯晶界滑动的应变速率低105个数量级。沿沿着重合的点阵边界清晰地观察到锯齿状结构，它是垂直于应力轴的微裂纹的聚集。此外，沿沿着晶界产生亚晶粒。从这些观察，晶界附近的局部化变形被认为是15 CrODS铁素体钢的主要变形过程。[doi：10.2320/matertrans.M2012143]
Oxide dispersion strengthened (ODS) ferritic steel developed as a fast breeder reactor fuel cladding is an advanced heat-resistant steel, and its high-temperature strength depends on not only transgranular deformation but also intergranular deformation. The objective of this study is to elucidate the grain boundary deformation process using 15CrODS ferritic steel. From the double logarithm plot for stress and strain rate at 800°C, the stress exponent n becomes over 10, and the real strain rate is an order of 105 lower than that which suggests that the simple grain boundary sliding. The serration structure, which is aggregation of micro-cracks perpendicular to the stress axis, was clearly observed along coincident site lattice boundaries. Also, sub-grains are produced along grain boundaries. From these observations, the localized deformation near grain boundary is considered to be the dominant deformation process of 15CrODS ferritic steel. [doi:10.2320/matertrans.M2012143]