Ti17合金网篮组织的断裂韧性及其预测模型研究  

Fracture Toughness and Its Prediction Model for Ti17 Titanium Alloy with Basket-Weave Microstructure

作　　者：冀胜利 曾卫东[1] 石晓辉[1] 张赛飞[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072 [2]中航工业陕西宏远航空锻造有限责任公司,陕西咸阳713801

出　　处：《稀有金属材料与工程》2017年第11期3293-3297,共5页Rare Metal Materials and Engineering

摘　　要：研究了Ti17钛合金网篮组织的断裂韧性及断裂行为,发现裂纹扩展路径曲折度(外因)及沿着裂纹扩展路径所消耗的塑性功(内因)对断裂韧性有显著影响,好的塑性及曲折的裂纹扩展路径有利于提高合金的断裂韧性。基于能量原理,建立了综合考虑内因和外因的断裂韧性预测模型,模型预测精度较高,误差在6%以内。分析模型发现,对网篮组织断裂韧性起决定作用的是其本征塑性功,占80%以上,裂纹扩展路径的贡献较小,在20%以内。The fracture toughness and fracture behavior of Ti17 titanium alloy with basket-weave microstructure were studied. The results show that fracture toughness is attributed to two major factors, namely the crack path tortuosity（extrinsic part） and plastic deformation work along the crack path（intrinsic part）. Good plasticity and tortuous crack propagation path are both favorable to improve the fracture toughness of Ti17 alloy. Moreover, based on the power theory, a fracture toughness prediction model was built, whose prediction error was within 6%. In addition, by analyzing the prediction results of this model, it can be found that the contribution of plasticity work to the fracture toughness of Ti17 alloy is the major part, which occupies over 80%. The contribution of crack propagation tortuosity to the fracture toughness of Ti17 alloy, however, is the minor part, which is within 20%.

关 键 词：Ti17 冷却 β锻 断裂韧性 模型 

分 类 号：TG146.23[一般工业技术—材料科学与工程]