Irradiation creep and microstructural changes in an advanced ODS ferritic steel during helium implantation under stress
Irradiation creep and microstructural changes in an advanced ODS ferritic steel during helium implantation under stress
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DOI：
10.1016/j.jnucmat.2008.12.081
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发表时间：
2009-04
影响因子：
3.1
通讯作者：
Jiachao Chen;M. Pouchon;A. Kimura;P. Jung;W. Hoffelner
中科院分区：
文献类型：
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作者：
Jiachao Chen;M. Pouchon;A. Kimura;P. Jung;W. Hoffelner
在573和773 K温度下，在20 - 250 MPa的单轴拉伸应力下，用氦均匀注入具有非常细的氧化物颗粒的高级氧化物弥散强化（ODS）铁素体钢，最大剂量约为0.38dpa（1650 appm-He），位移损伤率为4.4×10−6dpa/s。样品是小型化的狗骨头的形式，其中在氦注入期间，应变和电阻被同时监测。在573和773 K下，蠕变柔量分别为4.0×10− 6和11×10−6dpa− 1 MPa − 1。ODS钢样品的电阻率随剂量而降低，表明偏析和/或沉淀。用透射电镜详细研究了氦离子注入过程中微结构的演变。通过比较目前先进的ODS（K1）和具有更大氧化物颗粒的商用ODS铁素体钢（PM2000）的结果，研究了ODS颗粒尺寸对辐照蠕变和显微组织变化的影响。
An advanced oxide dispersion strengthened (ODS) ferritic steel with very fine oxide particles has been homogeneously implanted with helium under uniaxial tensile stresses from 20 to 250MPa to a maximum dose of about 0.38dpa (1650appm-He) with displacement damage rates of 4.4×10−6dpa/s at temperatures of 573 and 773K. The samples were in the form of miniaturized dog-bones, where during the helium implantation the straining and the electrical resistance were monitored simultaneously. Creep compliances were measured to be 4.0×10−6and 11×10−6dpa−1MPa−1at 573 and 773K, respectively. The resistivity of ODS steel samples decreased with dose, indicating segregation and/or precipitation. Evolution of microstructure during helium implantation was studied in detail by TEM. The effects of ODS particle size on irradiation creep and microstructural changes was investigated by comparing the results from the present advanced ODS (K1) to a commercial ODS ferritic steels (PM2000) with much bigger oxide particles.