硼含量对有序态(Fe,Co)_3V合金环境氢脆的影响  

Effect of B Content on Environmental Embrittlement of Ordered(Fe,Co)_3V Alloys

作　　者：杨彪[1] 陈业新[1,2] 李树龙[1] Yang Biao1, Chen Yexin1,2, Li Shulong1(1. Institute of Materials Science, Shanghai University, Shanghai 200072, China） （2. Laboratory for Microstructures, Shanghai University, Shanghai 200444, China)

机构地区：[1]上海大学材料研究所,上海200072 [2]上海大学微结构重点实验室,上海200444

出　　处：《稀有金属材料与工程》2018年第3期976-981,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51271102)

摘　　要：通过在真空和氢气环境下的拉伸实验,研究了硼含量对有序态(Fe,Co)_3V合金力学性能和环境氢脆的影响。结果表明,当在有序态(Fe,Co)_3V合金中添加0.02%B(质量分数)时,相对于无硼合金,合金的晶粒尺寸减小了27.5%,合金在真空和氢气中的抗拉强度和延伸率均达到最大值;而当硼含量继续增加时,合金的晶粒尺寸、合金在真空和氢气中的力学性能均保持不变。无硼有序态(Fe,Co)_3V合金在氢气中呈现严重的环境氢脆,当在合金中添加0.02%B后,合金氢脆因子降低了34.4%,合金的断口形貌由完全沿晶断口转变为穿晶和沿晶的混合断口;当合金中的硼含量继续增加时,合金的氢脆因子不再降低,恒定在50%左右,即硼原子只能部分抑制有序态(Fe,Co)_3V合金在氢气中的环境氢脆。The mechanical properties and environmental embrittlement of ordered （Fe,Co）3V alloys doped with various boron contents were investigated by tensile tests in vacuum and 1 kPa H2. The results show that the grain size of the ordered （Fe,Co）3V alloy doped with 0.02 wt%B decreases by 27.5% compared with boron-free （Fe,Co）3V alloy, while the tensile strength and elongation reach the maximum value. However, as the boron content in the ordered （Fe,Co）3V alloy exceeds 0.02 wt%, the grain size and mechanical properties remain unchanged both in vacuum and hydrogen gas. The ordered boron-free （Fe,Co）3V alloy exhibits serious environment embrittlement. By adding 0.02%B the hydrogen embrittlement factor of the ordered （Fe,Co）3V alloy decreases by 34.4% and the fracture morphology changes from full intergranular to mixed fracture of intergranular and transgranular. But when boron content increases continuously in the ordered （Fe,Co）3V alloy, the hydrogen embrittlement factor keeps about 50%, indicating boron cannot completely suppress the environmental embrittlement of the ordered （Fe,Co）3V alloy in hydrogen.

关 键 词：有序态(Fe Co)3V合金 硼含量 晶粒尺寸 环境氢脆 

分 类 号：TG146.413[一般工业技术—材料科学与工程] TG172[金属学及工艺—金属材料]