Effect of heat treatment on microstructure and mechanical properties of laser solid forming Inconel 718 superalloy

被引：21

作者：

Zhao, Weiwei ^{[1
]}

Lin, Xin ^{[1
]}

Liu, Fencheng ^{[1
]}

Zhao, Xiaoming ^{[1
]}

Chen, Jing ^{[1
]}

Huang, Weidong ^{[1
]}

机构：

[1] State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an

来源：

Zhongguo Jiguang/Chinese Journal of Lasers | 2009年 / 36卷 / 12期

关键词：

Inconel; 718; Laser solid forming; Laser technique; Microstructure; Tensile properties;

D O I：

10.3788/CJL20093612.3220

中图分类号：

学科分类号：

摘要：

The effects of heat treatment on the microstructure and mechanical properties of laser solid forming Inconel 718 superalloy have been investigated. As compared with as-deposited samples, direct aged (DA) microstructure of laser solid formed (LSF) Inconel 718 changed little, and still presents the microstructural characteristic of columnar dendrites which grow epitaxially from the substrate. However, the hardness and tensile strength of DA samples increase obviously. Three technology of homogenization, solution and double aging heat-treatment (960STA) result in complete dissolution of interdendritic Laves phase and the reduction of Nb segregation. Further the solution treatment results in the precipitation of acicular δ phase along grain boundaries, and the tensile strength and plasticity both reach the wrought standard of Q/3B 548-1996 at room and high temperature. The tensile fracture surface of DA samples presents anisotropic feature of dimples along deposition orientation of columnar dendrites array, which is similar to that of the as-deposited samples. It is found that the distribution anisotropy of dimples in LSF samples disappeared through 960STA treatment.

引用

页码：3220 / 3225

页数：5

共 18 条

[1]

Bai B., Yang L., Zhao Y., Exploration of process ″isothermal forging+direct aging″ for GH4169 alloy, J. Rare Metals, 26, 1, pp. 7-32, (2002)

[2]

Oblak J.M., Paulonis K.F., Duvall D.S., Coherency strengthening in Ni base alloys hardened by DO<sub>22</sub> γ″ precipitates, Metallurgical Transactions A, 5, 1, pp. 143-153, (1974)

[3]

Mahoney M.W., Superplatic properties of alloy 718, Superalloy 718 Metallurgy and Applications, pp. 391-405, (1989)

[4]

Hu H., Hot isosstatic pressing treatment of cast Ni-base superalloy, Acta Metallugica Sinica, 38, 11, pp. 1199-1202, (2002)

[5]

Wang S., Li H., Li H., Et al., Study on isothermal forging technology of FGH95 alloy, J. Rare Metals, 27, 4, pp. 452-454, (2003)

[6]

Zhong M., Sun H., Liu W., Et al., Boundary liquation and interface cracking characterization in laser deposition of Inconel 738 on directionally solidified Ni-based superalloy, Scripta Materialia, 53, pp. 159-164, (2005)

[7]

Mazumder J., Dutta D., Kikuchi N., Et al., Closed loop direct metal deposition: Art to part, Optics and Lasers in Engineering, 34, 4-6, pp. 397-414, (2000)

[8]

Yang H., Lin X., Chen J., Et al., Functionally gradient materials prepared with laser rapid forming, Chinese J. Lasers, 32, 4, pp. 567-570, (2005)

[9]

Zhong M., Yang L., Liu W., Et al., Laser direct manufacturing W/Ni telescope collimation component, Chinese J. Lasers, 31, 4, pp. 482-486, (2004)

[10]

Zhong M., He J., Liu W., Et al., A15-Nb<sub>3</sub>Al/B2 laminated-structure intermetallic composites produced by laser deposition, Chinese J. Lasers, 34, 12, pp. 1694-1699, (2007)

← 1 2 →