利用光学显微镜、扫描电镜、电子探针、金相图像分析软件等研究近等温变形量对TC4-DT钛合金显微组织和拉伸性能的影响规律.研究发现:随热变形程度的增大,晶界α相逐渐被破碎,晶内粗大的片状α相宽度逐渐增大,但是细片状的α相宽度变化不大.粗片状α相是由元素扩散引起的成分偏析形成,60％的变形程度下元素扩散充分,不同形态α相之间合金元素成分差别降低,使得最终组织较为均匀.晶内粗片状α相含量和位向随变形程度升高而变化,低变形程度下(20％)α/β相界不会成为位错滑移的障碍,位错主要集聚于晶界导致沿晶断裂.高变形程度(60％)使原来的两相位向关系被打破,相界成为位错滑移的障碍,强度和塑性都得到提高,室温拉伸断口呈现穿晶断裂.实验结果表明在本实验条件下60％的变形量可以获得较好的强度和塑性匹配.
参考文献
| [1] | 王小芳,陈明和,陈伟,朱知寿.TC4-DT钛合金高温热变形行为研究[J].航空材料学报,2012(01):30-34. |
| [2] | Gorynin, IV .Titanium alloys for marine application[J].Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing,1999(2):112-116. |
| [3] | HOWSON T E;BROADWELL R G.Advance in the Science and Technology of Titanium Alloy Processing[A].Los Angeles,California,USA,1996 |
| [4] | Ding R.;Guo Z.;Wilson A. .Microstructural evolution of a Ti-6Al-4V alloy during thermomechanical processing[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(2):233-245. |
| [5] | Peng, X.;Guo, H.;Wang, T.;Yao, Z..Effects of β treatments on microstructures and mechanical properties of TC4-DT titanium alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2012:55-63. |
| [6] | SEMIATIN S L;SEETHARAMAN V;WEISS I .The thermomechanical processing of alpha/beta titanium alloys[J].Journal of the Minerals,Metals & Materials Society,1997,49(06):33-39. |
| [7] | 郭鸿镇.合金钢与有色合金锻造[M].西安:西北工业大学出版社,1999:192. |
| [8] | LUTJERING G;WILLIAMS J C.Titanium[M].NewYork:Berlin Heidelberg,2007:204. |
| [9] | 郭鸿镇,张维,赵张龙,姚泽坤,虢迎光,王保善,赵永庆,曲恒磊.TC21新型钛合金的超塑性拉伸行为及组织演化[J].稀有金属材料与工程,2005(12):1935-1939. |
| [10] | 李晓芹.钛合金β锻造组织不均匀性研究[J].金属热处理,2000(03):17-20. |
| [11] | 王涛,郭鸿镇,赵严,姚泽坤,虢迎光,窦仲林.等温变形量对600℃TG6高温钛合金组织性能的影响[J].稀有金属材料与工程,2010(09):1540-1544. |
| [12] | Wang, T.;Guo, H.;Wang, Y.;Peng, X.;Zhao, Y.;Yao, Z. .The effect of microstructure on tensile properties, deformation mechanisms and fracture models of TG6 high temperature titanium alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2011(6):2370-2379. |
| [13] | 刘智恩.材料科学基础[M].西安:西北工业大学出版社,2003:193. |
| [14] | Sreeramamurthy Ankem;Harold Margolin;Charles A. Greene;Brett W. Neuberger;P. Gregory Oberson .Mechanical properties of alloys consisting of two ductile phases[J].Progress in materials science,2006(5):632-709. |
| [15] | 曾卫东,周义刚.冷速对TC11合金β加工显微组织和力学性能的影响[J].金属学报,2002(12):1273-1276. |
| [16] | JAWORSKI A;ANKEM S .Influence of the second phase on the room-temperature tensile and creep deformation mechanisms of α-β titanium alloys:part Ⅰ:Tensile deformation[J].Metallurgical Materials Transaction (A),2006,37(09):2739-2754. |
| [17] | 周义刚;曾卫东;李晓琴 等.钛合金高温形变强韧化机理[J].金属学报,1999,35(01):45-48. |
| [18] | BOYER R R;HAIL J A.Microstructure-property relationships in titanium alloys[A].TMS:Warrendale:PA,1993:77. |
| [19] | 王涛,郭鸿镇,张永强,姚泽坤,谭立军.热锻温度对TG6高温钛合金显微组织和力学性能的影响[J].金属学报,2010(08):913-920. |
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%