钛合金BT9低周疲劳变形结构的研究.pdfVIP

学兔兔 2009年第4期 铸 造 设 备 与 工 艺 2009年 8月 FOUNDRY EQUIPMENT AND TECHNOLOGY Aug．2009 No4 · 试验研究· 钛合金BT9低周疲劳变形结构的研究 刘继波 ，王连兴 。王兴国 (1．山东大学材料科学与工程学院，山东济南 250021； 2．黑龙江乌拉嘎黄金矿业有限公司质检中心，黑龙江伊春 153013；3．大连理工大学，辽宁大连 116300) 摘 要：在室温下对钛合金BT一9单轴拉压及多轴非比例载荷的低周疲劳试验后．利用扫描电镜及透射电镜 对材料的疲劳变形结构进行观测。结果表明：在单轴加栽条件下，断口的形貌为韧窝。在非比例加载条件下，断口 的形貌为准解理断裂和解理断裂。随着非比例载荷程度(相位角)的增大，断口的形貌由蜂窝状韧窝向河流花样 的解理断裂形貌方向发展。 关键词：相位角；解理断裂；韧窝；钛合金BT-9 中图分类号：TG146．23：TG113．25+5 文献标识码：A 文章编号：1674—6694(2009)04—0021-03 Study on Low Cycle Fatigue Deformed Structure for Titanium Alloy BT9 LIU Ji-bo z, rAⅣG Lian-xing ． ⅣG Xing-guo。 (1．College ofMaterial Science and Engineering，Shandong university，Jinan Shandong 250021，China； 2．Helon~iang Wulaga Gold Mining Industry CO．，LTD，Quality Control Center，Ywhun Helon~iang 153013，China； 3．Dalian University ofTechnology,Dalian Liaoning 116300，China) Abstract：The low—cycle fatigue tests of Titanium alloy BT9 under uniaxial tension-compression and muhiaxial non-proportional low-cycle loading were carried out．The scanning electron microscopy and transmission electron microscopy was used to observe the fatigue deformation structure of materials． The results showed that，the fracture surface morphology of the material takes on the dimples under uniaxial loading conditions．The morphology of fracture takes on cleavage fracture and quasi-cleavage fracture under the non—proportional loading conditions．With the degree of non—proportional load phase angle)increasing，the morphology of fracture surface change from dimples by the honeycomb-like pattern to the river pattern cleavage fracture． K