Cause Analysis of Turbine Shaft Ultrasonic Flaw Detection Disqualification

Wang Yongsheng; Sun Shengyu; Sun Xin; Guo Libo

doi:doi:10.11648/j.ajmme.20190301.13

| Peer-Reviewed

Cause Analysis of Turbine Shaft Ultrasonic Flaw Detection Disqualification

Wang Yongsheng, Sun Shengyu, Sun Xin, Guo Libo

Published in American Journal of Mechanical and Materials Engineering (Volume 3, Issue 1)

Received: 20 November 2018 Accepted: 27 May 2019 Published: 18 June 2019

Views: Downloads:

Download PDF

Share This Article

Twitter
Linked In
Facebook

Abstract

Heavy forging is a kind of large or deformed-size forge, used on marine, roller or power station roter. etc, which are fabricated by free forging or hydraulic compressor. The turbine shaft products, steel grade ASTM668E, rejected during ultrasonic inspection. Aiming at the problem of ultrasonic flaw detection disqualification, through Positioning saw cutting, the macroscopic test, SEM and Micrographic examination are taken out. The main cause of the disqualification were found out. The results show that, because of the exist of unbalance crystallization, highly grade general loosen happened in the cycle area, which cause the energy of ultrasonic are weakened a lot, then lead to the central quality of the forging cannot be detected clearly. What’s more, the manganese sulfide precipitated at the grain boundary because of the selective crystallization occurs in the central of the ingot. The tensile stress on the interface between steel and inclusion separate the steel, caused the cracks which couldn’t be welded as the plastic deformation happened in forging press, then cause the cracks. Reduce the molten steel’s overheat and the freezing time can improve the defect of general loosen and the gartering of low-melting ingredients. Increase the compression ratio can take out too in the hot work process to solve the problem.

Published in	American Journal of Mechanical and Materials Engineering (Volume 3, Issue 1)
DOI	10.11648/j.ajmme.20190301.13
Page(s)	20-24
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2019. Published by Science Publishing Group

Keywords

Heavy Forging, ASTM668E, UT, General Loosen, Manganese Sulfide

References

[1]	YAO Ze-kun. Forging Technology [M]. XI AN: Press of Northwestern Polytechnic University, 1998: 77.
[2]	MA Qing-xian, et al. Study on Mechanism of Defects Originated from Inclusions in Processes of Heavy Forgings, [J]. China Mechanical Engineering. 2001, 12 (8):943-945.
[3]	DONG Lan-feng, ZhongYue-xian, et al. Research on the Dynamic Recrystallization Behavior of 20SiMn, [J]. China Mechanical Engineering. 2008, 19 (10):1245-1249.
[4]	GB/T1979-2001, Grading Diagrams for Macrostructure and Defect of structural steels [S].
[5]	LI Dai-zhong. Nonmetallic Inclusion in Steel [M], Peking: Science Press, 1983.
[6]	SHEN Cai-fang, SUN She-cheng, CHEN Jian-bin, et al. Technology and equipment of EAF Steel making [M], Peking: Metallurgical industry Press, 2001.
[7]	LIU Xue. Precipitation Behavior of MnS Inclusion in the steel [D]. Thesis for Master’s Degree of Northeastern University, June 2012.
[8]	Γ. M. Iczkovits. Deoxidation and Modifying Technology of Inclusion in Steel [M], Peking: Metallurgical industry Press, 1986.
[9]	Luu W C, Wu I K. Effects of sulfide inclusion on hydrogentmnsport in steels [J], Materials Letters, 1995, 24 (2):175-179.
[10]	Li Wei-liao. Nonmetallic Inclusion in Steel [M], Peking: Science Press, 1988.
[11]	Diederichs R, Bite R, Pariser G, et al. Modelling of manganese sulphide formation during solidification, Part i: Correlation of solidification and MnS formation [J], Steel Research International, 2006, 77 (4):256-264.
[12]	XU Jian-bing, YU Ji-xing, SU Kai. The Effect of Sulphide on Fatigue Crack Initiation of Cold Ring-Rolling Mandrel [J], China Metal Forming Equipment & Manufacturing Technology, 2006 (4):80-81.
[13]	YANG RANG. Lectures foundation of High Strength Low Alloy(HSLA) SteelsⅡ [M], Peking: China Metallurgy society, 1986.
[14]	REN Xue-chong, LI Gao-yang, et al. Effects of Inclusions and Grain Size on Impact Toughness of a Cleaning Wheel steel at Room Temperature [J]. PTCA (PART A: PHYS. TEST), 2012, 48 (4):207-212.
[15]	XIA Zhi-xin, YE Wen-bing, YANG Zhuo-yue, et al. Effect of Morphology of MnS Inclusions on Toughness of Ultra-High Strength Steel Produced by Different Smelting Processes [J], Journal of Iron and Steel Research, 2009, 21 (3):13-14.

Cite This Article

Plain Text BibTeX RIS

APA Style

Wang Yongsheng, Sun Shengyu, Sun Xin, Guo Libo. (2019). Cause Analysis of Turbine Shaft Ultrasonic Flaw Detection Disqualification. American Journal of Mechanical and Materials Engineering, 3(1), 20-24. https://doi.org/10.11648/j.ajmme.20190301.13

Copy | Download

ACS Style

Wang Yongsheng; Sun Shengyu; Sun Xin; Guo Libo. Cause Analysis of Turbine Shaft Ultrasonic Flaw Detection Disqualification. Am. J. Mech. Mater. Eng. 2019, 3(1), 20-24. doi: 10.11648/j.ajmme.20190301.13

Copy | Download

AMA Style

Wang Yongsheng, Sun Shengyu, Sun Xin, Guo Libo. Cause Analysis of Turbine Shaft Ultrasonic Flaw Detection Disqualification. Am J Mech Mater Eng. 2019;3(1):20-24. doi: 10.11648/j.ajmme.20190301.13

Copy | Download

@article{10.11648/j.ajmme.20190301.13,
  author = {Wang Yongsheng and Sun Shengyu and Sun Xin and Guo Libo},
  title = {Cause Analysis of Turbine Shaft Ultrasonic Flaw Detection Disqualification},
  journal = {American Journal of Mechanical and Materials Engineering},
  volume = {3},
  number = {1},
  pages = {20-24},
  doi = {10.11648/j.ajmme.20190301.13},
  url = {https://doi.org/10.11648/j.ajmme.20190301.13},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajmme.20190301.13},
  abstract = {Heavy forging is a kind of large or deformed-size forge, used on marine, roller or power station roter. etc, which are fabricated by free forging or hydraulic compressor. The turbine shaft products, steel grade ASTM668E, rejected during ultrasonic inspection. Aiming at the problem of ultrasonic flaw detection disqualification, through Positioning saw cutting, the macroscopic test, SEM and Micrographic examination are taken out. The main cause of the disqualification were found out. The results show that, because of the exist of unbalance crystallization, highly grade general loosen happened in the cycle area, which cause the energy of ultrasonic are weakened a lot, then lead to the central quality of the forging cannot be detected clearly. What’s more, the manganese sulfide precipitated at the grain boundary because of the selective crystallization occurs in the central of the ingot. The tensile stress on the interface between steel and inclusion separate the steel, caused the cracks which couldn’t be welded as the plastic deformation happened in forging press, then cause the cracks. Reduce the molten steel’s overheat and the freezing time can improve the defect of general loosen and the gartering of low-melting ingredients. Increase the compression ratio can take out too in the hot work process to solve the problem.},
 year = {2019}
}

Copy | Download

TY - JOUR
T1 - Cause Analysis of Turbine Shaft Ultrasonic Flaw Detection Disqualification
AU - Wang Yongsheng
AU - Sun Shengyu
AU - Sun Xin
AU - Guo Libo
Y1 - 2019/06/18
PY - 2019
N1 - https://doi.org/10.11648/j.ajmme.20190301.13
DO - 10.11648/j.ajmme.20190301.13
T2 - American Journal of Mechanical and Materials Engineering
JF - American Journal of Mechanical and Materials Engineering
JO - American Journal of Mechanical and Materials Engineering
SP - 20
EP - 24
PB - Science Publishing Group
SN - 2639-9652
UR - https://doi.org/10.11648/j.ajmme.20190301.13
AB - Heavy forging is a kind of large or deformed-size forge, used on marine, roller or power station roter. etc, which are fabricated by free forging or hydraulic compressor. The turbine shaft products, steel grade ASTM668E, rejected during ultrasonic inspection. Aiming at the problem of ultrasonic flaw detection disqualification, through Positioning saw cutting, the macroscopic test, SEM and Micrographic examination are taken out. The main cause of the disqualification were found out. The results show that, because of the exist of unbalance crystallization, highly grade general loosen happened in the cycle area, which cause the energy of ultrasonic are weakened a lot, then lead to the central quality of the forging cannot be detected clearly. What’s more, the manganese sulfide precipitated at the grain boundary because of the selective crystallization occurs in the central of the ingot. The tensile stress on the interface between steel and inclusion separate the steel, caused the cracks which couldn’t be welded as the plastic deformation happened in forging press, then cause the cracks. Reduce the molten steel’s overheat and the freezing time can improve the defect of general loosen and the gartering of low-melting ingredients. Increase the compression ratio can take out too in the hot work process to solve the problem.
VL - 3
IS - 1
ER -

Copy | Download

Author Information

Wang Yongsheng

Department of Chief Engineer’s Office, Dongbei Special Steel Group, Dalian, China
Sun Shengyu

Department of Chief Engineer’s Office, Dongbei Special Steel Group, Dalian, China
Sun Xin

ESR Plant of Dongbei Special Steel Group, Dalian, China
Guo Libo

Central Laboratory of Dongbei Special Steel Group, Dalian, China

Download PDF

Sections

Plain Text BibTeX RIS

APA Style

Wang Yongsheng, Sun Shengyu, Sun Xin, Guo Libo. (2019). Cause Analysis of Turbine Shaft Ultrasonic Flaw Detection Disqualification. American Journal of Mechanical and Materials Engineering, 3(1), 20-24. https://doi.org/10.11648/j.ajmme.20190301.13

Copy | Download

ACS Style

Wang Yongsheng; Sun Shengyu; Sun Xin; Guo Libo. Cause Analysis of Turbine Shaft Ultrasonic Flaw Detection Disqualification. Am. J. Mech. Mater. Eng. 2019, 3(1), 20-24. doi: 10.11648/j.ajmme.20190301.13

Copy | Download

AMA Style

Wang Yongsheng, Sun Shengyu, Sun Xin, Guo Libo. Cause Analysis of Turbine Shaft Ultrasonic Flaw Detection Disqualification. Am J Mech Mater Eng. 2019;3(1):20-24. doi: 10.11648/j.ajmme.20190301.13

Copy | Download

@article{10.11648/j.ajmme.20190301.13,
  author = {Wang Yongsheng and Sun Shengyu and Sun Xin and Guo Libo},
  title = {Cause Analysis of Turbine Shaft Ultrasonic Flaw Detection Disqualification},
  journal = {American Journal of Mechanical and Materials Engineering},
  volume = {3},
  number = {1},
  pages = {20-24},
  doi = {10.11648/j.ajmme.20190301.13},
  url = {https://doi.org/10.11648/j.ajmme.20190301.13},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajmme.20190301.13},
  abstract = {Heavy forging is a kind of large or deformed-size forge, used on marine, roller or power station roter. etc, which are fabricated by free forging or hydraulic compressor. The turbine shaft products, steel grade ASTM668E, rejected during ultrasonic inspection. Aiming at the problem of ultrasonic flaw detection disqualification, through Positioning saw cutting, the macroscopic test, SEM and Micrographic examination are taken out. The main cause of the disqualification were found out. The results show that, because of the exist of unbalance crystallization, highly grade general loosen happened in the cycle area, which cause the energy of ultrasonic are weakened a lot, then lead to the central quality of the forging cannot be detected clearly. What’s more, the manganese sulfide precipitated at the grain boundary because of the selective crystallization occurs in the central of the ingot. The tensile stress on the interface between steel and inclusion separate the steel, caused the cracks which couldn’t be welded as the plastic deformation happened in forging press, then cause the cracks. Reduce the molten steel’s overheat and the freezing time can improve the defect of general loosen and the gartering of low-melting ingredients. Increase the compression ratio can take out too in the hot work process to solve the problem.},
 year = {2019}
}

Copy | Download