钛合金硬质夹杂缺陷分析  

Analysis of Hard Impurity Defect of Titanium Alloy

作　　者：李雪飞[1] 黄利军[1] 黄旭[1] 储俊鹏[1] 张明杰[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《宇航材料工艺》2015年第6期75-77,共3页Aerospace Materials & Technology

摘　　要：采用VAR三次熔炼方法制备含有YG8刀具硬质合金杂质的铸锭,铸锭经开坯改锻制成Φ40 mm棒材,超声波探伤确定杂质位置。用光学显微镜和扫描电镜对杂质边缘的组织形貌及成分进行分析。研究结果表明,硬质合金部分熔化,边界含有明显的过渡区域,过渡区含有钛合金基体元素和刀具硬质合金元素并发生了扩散。杂质的存在会引起应力集中,容易萌生疲劳裂纹,进而影响产品的使用性能。The ingot including impurity of YG8 cutter hard alloy was made by the measure of VAR. Φ40 mm bars were made from ingot by forging and the position of impurity was located by ultrasonic detection. The appearance of impurity was observed through optical microscope and SEM. The results show that hard alloy melts partially and the boundary has transition area. The transition area includes elements of titanium and elements of cutter hard alloy, where diffusion happens. The existence of impurity leads to stress focus which produces fatigue flaw easily, then influ- ences the quality of product.

关 键 词：钛合金 硬质合金 杂质 

分 类 号：TB30[一般工业技术—材料科学与工程]