Cr-Ti-Y-O型纳米团簇氧化物弥散强化CLAM钢的研究

项目名称： Cr-Ti-Y-O型纳米团簇氧化物弥散强化CLAM钢的研究

项目编号： No.51271175

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 单以银

作者单位： 中国科学院金属研究所

项目金额： 80万元

中文摘要： 低活化氧化物弥散强化钢（ODS钢）具有高强度和优异的抗辐照性能，是核聚变堆用关键部件备选材料。ODS钢主要是通过机械合金化实现氧化物固溶、纳米尺度弥散分布而制备的粉末冶金材料，目前这种粉末冶金法制备的ODS钢在工艺上存在的不足是：①制备过程中由于粉体表面活性高导致增氧严重，不利于高温蠕变强度的提高；②粉体球磨过程中的加工硬化导致粉体表面硬度高，加大了烧结难度，不利于孔隙率的降低，而孔洞的存在严重影响材料韧性、蠕变性能和抗辐照性能。本课题拟采用预球磨Cr-Y或Cr-Ti-Y，并结合低温氢气还原的方法对粉体进行终脱氧来解决粉体增氧问题。对粉体进行保护气氛下短时退火处理，在保证晶粒度轻微变化的同时降低球磨粉体的表面硬度，降低烧结后ODS钢的孔隙率。将通过预球磨和氢气还原的ODS钢研究，探索粉体氧含量和孔隙率的控制对性能影响的机制，为发展核聚变堆用关键材料提供技术和理论基础。

中文关键词： ODS钢；机械合金化；氢气还原；差热分析；制备工艺

英文摘要： Oxide dispersion strengthened (ODS) reduced activation ferritic/martensitic (RAFM) steels, which produced by mechanical alloying (MA) of the elemental (or prealloyed) metallic powder with yttria (Y2O3) oxide powder and consolidated by hot extrusion or hot isostatic pressing, are promising candidate materials for the key parts in the future fusion reactor. These materials are attractive due to their excellent high temperature mechanical properties and good resistance to nuclear irradiation due to the dispersion of thermally stable oxide nanoparticles into the ferritic matrix. There are several drawbacks for the preparation of ODS RAF steels: firstly, the high temperature creep property is worse due to the high oxygen absorption of the refined powders; secondly, there existed high porosity after hot consolidation because the high hardness of powders induced by MA strain hardening. The existence of porosities resulted in the deleterious properties such as ductility, creep and irradiation resistant. A plan for the pre-MA Cr-Y or Cr-Ti-Y and the following low temperature hydrogen annealing is proposed for the decreasing of oxidation of powders. It will decrease the ODS sintered porosity of compact after short-time low temperature annealing. The research will be carried out for the double-step MA and hydrogen annealin

英文关键词： Oxide dispersion strengthened steel；mechanical alloying；hydrogen reduction；thermal analysis；preparation technology