Life extension heat treatment of IN 783 bolts

Qiang Zhao; Jiaqing Wang; Junjian Liu; Yue Wu; Xiaodong Du

doi:10.3139/120.111452

Article

Life extension heat treatment of IN 783 bolts

Qiang Zhao , Jiaqing Wang , Junjian Liu , Yue Wu and Xiaodong Du

Published/Copyright: December 20, 2019

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From the journal Materials Testing Volume 62 Issue 1

Abstract

A large number of strip-like structures were found distributed along the axial direction of inconel 783 alloy bolts. Large-sized Nb were concentrated and precipitated in the interior, which makes the material structure uneven, resulting in a reduction of toughness and plasticity. Adopting a heat treatment method for increasing the solution temperature and at the same time prolonging the aging time improved the material properties to a certain extent. The results show that the large Nb easily develops inclusions, which reduces the impact properties of the material. After heat treatment, the strip-like structures disappeared, the size of the Nb decreased and nano-scale carbides were precipitated out, thus increasing plasticity by 11.5 %, toughness by nearly two times and improving the comprehensive mechanical properties in general.

∗Correspondence Address, Professor Xiaodong Du, School of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui 230009, P. R. China, E-mail: hfutzhaoq@163.com, hfutdxd@126.com

Xiaodong Du, born in 1966, is Professor and Doctoral Supervisor as well as Head of the Metal Materials Engineering Department and the School of Materials Science and Engineering at the Hefei University of Technology. He graduated from the Hefei University of Technology as MSc in Materials Science in 1993 and then taught at the university. He graduated from the Hefei University of Technology with a Doctoral degree in Materials Science in 2006. He is mainly engaged in the research and development of high-performance metal materials.

Qiang Zhao, born in 1994, is a Postgraduate Student at the Hefei University of Technology in Hefei, China, with research interests in high-performance metal materials.

Jiaqing Wang, born in 1984, works at the Datang Boiler and Pressure Vessel Testing Center Co. Ltd. as Director of the Technical Department and Senior Engineer, with research interests in high-performance metal materials.

Junjian Liu, born in 1985, works at the Datang Boiler and Pressure Vessel Testing Center Co. Ltd. as an Engineer in the Department of Physics and Chemistry with research interests in high-performance metal materials.

Yue Wu, born in 1989, works at the Datang Boiler and Pressure Vessel Testing Center Co. Ltd. as an engineer in the Department of Physics and Chemistry, with research interests in high-performance metal materials.

References

1 J. Q.Peng, Y. F.Li: Low expansion superalloys for ultra supercritical steam turbines, Thermal Turbine44 (2015), No. 1, pp. 72–7710.13707/j.cnki.31-1922/th.2015.01.017Search in Google Scholar

2 T.Zhang, L. T.Hao, F.Tian: Research progress of high temperature materials for 700 °C ultra-supercritical thermal power units, Materials For Mechanical Engineering40 (2016), No. 2, pp. 1–610.11973/jxgccl201602001Search in Google Scholar

3 B.Kang, X. B.Liu, C.Cisloiu: High temperature moire interferometry investigation of creep crack growth of Inconel 783 – environment and beta-phase effects, Materials Science & Engineering A347 (2003), No. 1, pp. 205–21310.1016/S0921-5093(02)00594-4Search in Google Scholar

4 L. X.Yu, X. F.Sun, W. R.Sun: Precipitation behaviour of and γ‘ in high Al low thermal expansion superalloy, Materials Science & Technology27 (2014), No. 1, pp. 421–42510.1179/026708309X12547309760920Search in Google Scholar

5 L.Ma, K. M.Chang: Effects of different metallurgical processing on microstructures and mechanical properties of Inconel alloy 783, Journal of Materials Engineering and Performance13 (2004), No.1, pp. 32–3810.1361/10599490417560Search in Google Scholar

6 C.Dong, W. G.Zheng: Development and prospect of modern steam turbine materials and their manufacturing processes, Thermal Process Technology16 (2014), pp. 14–1510.14158/j.cnki.1001-3814.2014.16.061Search in Google Scholar

7 S. Z.Li, L. M.Fu, A. D.Shan: Effect of diffusion annealing on microstructure and mechanical properties of Inconel 783 alloy, Materials For Mechanical Engineering40 (2016), No. 8, pp. 7–1110.11973/jxgccl201608002Search in Google Scholar

8 Z.Shen: Study on the Microstructure and Stress Relaxation Properties of Iinconel 783 Alloy, PhD Thesis, Shanghai Jiaotong University, Shanghai, P. R. China (2010)Search in Google Scholar

9 Y. Y.Zhang: Study on the Microstructure and Performance Optimization of GH783 Alloy, PhD Thesis, Huazhong University of Science and Technology, Huazhong, P. R. China (2006)Search in Google Scholar

Published Online: 2019-12-20

Published in Print: 2020-01-07

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