Gd含量对06Cr19Ni10不锈钢热中子屏蔽性能及微观组织的影响

Effect of Gd Content on Thermal Neutron Shielding Performance and Microstructure of 06Cr19Ni10 Stainless Steel

针对核电站对中子屏蔽材料结构功能一体化的需求,开展了Gd含量对06Cr19Ni10不锈钢热中子屏蔽性能及微观组织的影响研究,通过热中子屏蔽计算仿真分析,并以此为指导开展了不同Gd含量的Gd-06Cr19Ni10熔炼和轧制试验,采用OM、SEM等方法对不锈钢试样进行微观组织分析。结果表明:Gd的添加可以细化06Cr19Ni10不锈钢晶粒,但易形成脆性的Ni-Gd第二相,随着Gd含量的提高,Ni-Gd第二相面积分数也明显增加,使得06Cr19Ni10不锈钢的塑性下降,轧制性能明显降低。结合热中子屏蔽计算分析和轧制试验结果,认为Gd含量为1.7%(质量分数)左右时Gd-06Cr19Ni10可以获得较为均衡的热中子屏蔽性能和材料轧制性能。

In view of the requirement of nuclear power plant for the integration of structure and function of neutron shielding materials,the influence of Gd content on thermal neutron shielding performance and microstructure of 06Cr19Ni10 stainless steel was studied. Based on thermal neutron shielding calculation and simulation analysis, the melting and rolling tests of Gd-06Cr19Ni10 with different Gd contents were carried out. OM and SEM results show that the addition of Gd can refine the grain size of 06Cr19Ni10 stainless steel, but it is easy to form the brittle Ni-Gd second phase. With the increase of Gd content, the area fraction of Ni-Gd second phase also increases obviously, which makes the plasticity of 06Cr19Ni10 stainless steel decrease, and the rolling property obviously reduce. Combined with thermal neutron shielding calculation and rolling test results, it is considered that Gd-06Cr19Ni10 can obtain relatively balanced thermal neutron shielding performance and rolling performance when Gd content is about 1.7wt%.