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Physicochemical characteristic analysis on shoulder ring flaw of pressure boost gas valve in liquid oxygen supply system(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2015年04期
Page:
67-73
Research Field:
研究与设计
Publishing date:

Info

Title:
Physicochemical characteristic analysis on shoulder ring flaw of pressure boost gas valve in liquid oxygen supply system
Author(s):
QIN Yongtao;  GAO Qiang;  WU Rongyan;  YANG Zhanwei;  TIAN Baoyun
Xi’an an Aerospace Propulsion Test Technology Institute, Xi’an 710100, China
Keywords:
flaw;  stress corrosion;  physicochemical characteristic;  precautionary measure
PACS:
V431-34
DOI:
-
Abstract:
Aiming at the shoulder ring flaw phenomenon occurred in the working process of pressure boost gas valve of liquid oxygen supply system in a liquid rocket engine testing process, surface morphology and section morphology of valve shoulder ring flaw were checked by macroscopic observation, and physicochemical analysis of valve shoulder ring was performed to avoiding hidden danger in liquid rocket engine testing process, to assure the normal gas supply and determine the main source of flaw. The corrosion property was confirmed by observation of fracture corrosion morphology metallographic organization in flaw source zone and flaw expansion zone, and by material analysis of shoulder ring matrix. The material composition, processing technology and hardness were corrosion property were defined by energy spectrum analysis, ferrite measurement and remnants stress research. The main source and inducing factors of stress corrosion were determined by finite element analysis for further researching the inner mechanism of valve shoulder ring flaw. Finally, the precautionary measures of valve shoulder ring flaw were established to assure valve performance and provide a support for safety and reliability of liquid rocket engine testing process, and an approach for physicochemical characteristic analysis of others equipments.

References:

[1]孙秋霞. 材料腐蚀与防护[M]. 北京: 冶金工业出版社, 2001.
[2]许淳淳, 张新生, 胡钢. 不锈钢冷加工形变诱发马氏体相变及其腐蚀行为[J]. 材料保护, 2002, 35(3): 15-17.
[3]肖纪美. 不锈钢的金属学问题[M]. 北京: 冶金工业出版社, 2006.
[4]罗鑫. 304不锈钢的晶界特征分布及其对应力腐蚀开裂的影响[D]. 上海: 上海大学, 2009.

[5]夏爽. 690合金中晶界特征分布及其演化机理的研究[D]. 上海: 上海大学, 2007.

[6]ANDLE V. Twinning-related grain boundary engineering [J]. Acta Mater, 2004, 52: 4067-4070.
[7]LEE S L, RICHARDS N L. The effect of single-step low strain and an nealing of nickel oll grain boundary character [J]. Mater Sci Eng A, 2005, 390: 81-85.
[8]陆永浩, 褚武扬, 高克玮, 乔利杰. 304L不锈钢在高温水中的应力腐蚀裂纹扩展[J]. 金属学报, 2004, 40(7): 763- 767.
[9]GOTTSTEIN G, MA Y, SHVINDLERMAN L S. Triple junction motion and grain microstructure evolution[J]. Acta Mater, 2005, 53: 1535-1544.
[10]陈鸿海. 金属腐蚀学[M]. 北京：北京理工大学出版社, 1995.
[11]马毅. 奥氏体不锈钢的应力腐蚀研究[D]. 大连：大连理工大学, 2009.

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