通过金相、硬度、拉伸以及疲劳实验,分析了TC2钛合金焊接接头显微组织结构、硬度分布规律及拉伸、疲劳性能,并综合疲劳断口特征,进一步分析了焊接接头光滑试样的疲劳性能与影响因素.结果表明,焊缝区为α+α′相的魏氏组织,热影响区为α+α′+少量β相的魏氏组织,母材为α+β相的等轴组织.焊缝区的硬度高于母材50HV,塑性较差,由于焊缝内几何不连续缺陷的存在使其疲劳性能较低;热影响区的硬度较低,塑性较好,其拉伸强度是焊接接头部位的最薄弱区,但却有较好的疲劳性能.
参考文献
| [1] | Soboyejo W O;MERCER C;LOU K et al.Investigation of the fatigue and fracture behavior of Mn-containing gamma titanium aluminides[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1995,26:2275-2291. |
| [2] | SUGANO Mikio;TSUCHIDA Yasuo;SATAKE Tadaaki et al.Microstructural study of fatigue fracture in titanium-molybdenum alloys[J].Materials Science and Engineering A,1998,243:163-168. |
| [3] | Wang S H;MUELLER C .Study on the change of fatigue fracture mode in two titanium alloys[J].Fatigue & Fracture of Engineering Material & Structure,1998,21:1077-1087. |
| [4] | Imam MA.;Chu HP.;Rath BB. .Fatigue properties of titanium alloy Ti-6Al-2Cb-1Ta-0.8Mo[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(1/2):457-461. |
| [5] | Jinkeun Oh;NACK J Kim;SUNGHAK Lee;EUI W Lee .Correlation of fatigue properties and microstructure in investment cast Ti-6Al-4V welds Mater[J].Sci Engng(A),2003,340:232-242. |
| [6] | 中国机械工程学会焊接学会.焊接金相图谱[M].北京:机械工业出版社,1987:404-427. |
| [7] | 崔约贤;王长利.金属断口分析[M].哈尔滨:哈尔滨工业大学出版社,1998:151-212. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%