用脉冲激光熔覆方法在TC6钛合金表面制备具有柱状组织特征的钛合金涂层,研究了涂层的组织特征和液-固前沿热力学参数的变化及其对柱状组织的影响.结果表明,该涂层的组织形态具有典型的柱状特征,涂层仍由α'马氏体构成,但是其尺寸更加细小,柱状组织中主要合金元素分布的均匀性显著提高.柱状组织是在"液相→β相"转变过程中由G/R比值所决定的原始柱状β相结构在室温下的残留.在凝固过程中,固液界面处G/R值的变化决定了所获得的柱状β相形态的变化,并最终导致柱状组织向非柱状组织转变.
参考文献
| [1] | Z.Y.Ma,A.L.Pilchak,M.C.Juhas,J.C.Williams,Microstructural refinement and property enhancement of cast light alloys via friction stir processing,Scripta Materialia,58(5),361(2008) |
| [2] | XIAO Xuan,GUO Jianting,YU Haipeng,Effect of cooling rate from solution heat treatment on the microstructure and mechanical properties of superalloy DZ417G,Chinese Journal of Materials Research,20(5),533(2006)(肖旋,郭建亭,于海朋,固溶处理冷却速度对 DZ417G 合金组织性能的影响,材料研究学报,20(5),533(2006)) |
| [3] | LIU Liming,DU Xin,ZHU Meili,CHEN Guoqing,Research on the microstructure and properties of weld repairs in TA15 titanium alloy,Materials Science and Engineering:A,445-446(2),691(2007) |
| [4] | WANG Yaoning,MA Hongzhou,GUO Zhijun,ZHAO Xicheng,Effects of heat treatment on microstructure and properties of BT-20 alloy,Hot Working Technology,36(12),52(2007)(王耀宁,马红周,郭志军,赵西城,热处理对BT-20钛合金组织和性能的影响,热加工工艺,S6(12),52(2007)) |
| [5] | M.Mckellen,CHEN Shiqing,CHEN Rongzhang,Directional Solidification of High-Temperature Material (Beijing,Aviation Industry Press,1988) p.121(M.麦克莱恩,陈石卿,陈荣章,定向凝固高温材料(北京,航空工业出版社,1988)P.121) |
| [6] | XIE Yujiang,WANG Maocai,HUANG Dawei,Comparative study of microstructural characteristics of electro-spark and Nd:YAG laser epitaxially growing coatings,Applied Surface Science,253(14),6149(2007) |
| [7] | LIAO Xiliang,ZHAI Qijie,SONG Changjiang,CHEN Wenjie,GONG Yongyong,Effects of electric current pulse on stability of solid/liquid interface of Al-4.5 wt.% Cu alloy during directional solidification,Materials Science and Engineering:A,466(1-2),56(2007) |
| [8] | M.Gunduz,H.Kaya,Effect of solidification processing parameters on the cellular spacings in the Al-0.1wt% Ti and Al-0.5wt% Ti alloys,Journal of Alloys and Compounds,439(1-2),114(2007) |
| [9] | W.Kurz,D.J.Fisher,Fundamentals of Solidification,(Enfield,Trans Tech Publications Ltd,1998) p.86-88 |
| [10] | M.Balasubramanian,V.Jayabalan,V.Balasubramanian,Effect of microstructure on impact toughness of pulsed current GTA welded α-β titanium alloy,Materials Letters,62(6-7),1102(2008) |
| [11] | N.Vanderesse,E.Maire,M.Darrieulat,F.Montheillet,M.Moreaud,D.Jeulin,Three-dimensional microtomo-graphic study of Widmanstatten microstructures in an alpha/beta titanium alloy,Scripta Materialia,58(6),512(2008) |
| [12] | YAO Wei,GONG Shuili,CHEN Li,Effects of postweld heat treatment in vacuum on properties of laser welded joint of BT20 titanium alloy,Welding,6,21(2003)(姚伟,巩水利,陈俐,焊后真空热处理对BT20钛合金激光焊接接头性能的影响,焊接,6,21(2003)) |
| [13] | K.Keshava Murthy,S.Sundaresan,Phase transformations in a welded near-α titanium alloy as a function of weld cooling rate and post-weld heat treatment conditions,Journal of Materials Science,33(3),817(1998) |
| [14] | W.A.Baeslack,F.D.Mullins,Phase transformations in a welded near-alpha titanium alloy-IMI 829,Journal of Materials Science Letters,1(9),371(1982) |
| [15] | N.A.Berjeza,S.P.Velikevitch,V.I.Mazhukin,I.Smurov and G.Flamant,Influence of temperature gradient to solidification velocity ratio on the structure transformation in pulsed-and CW-laser surface treatment,Applied Surface Science,86(1-4),303(1995) |
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%