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Experimental Study on Fracture Failure of Brazing Structure for Stainless Steel EGR Cooler

Author: ChenWeiZuo
Tutor: QianYiYu；HePeng
School: Harbin Institute of Technology
Course: Materials Processing Engineering
Keywords: An exhaust gas recirculation cooler Stainless steel Nickel-based brazing material Fatigue fracture
CLC: TG454
Type: Master's thesis
Year: 2008
Downloads: 37
Quote: 0
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Abstract


Reduce vehicle exhaust emissions requirements from year to year as the world stricter exhaust gas recirculation cooler gradually for countries to Engine Company commonly used . Exhaust gas recirculation cooler working environment for high temperature and corrosive gases , and withstand vibration fatigue loading , this cooler brazed joint quality and reliability of the high demand . This article is for 340021-01 exhaust gas recirculation cooler bench test brazing structure fracture failure problem . Cooler material for austenitic stainless steel 304L , BNi-5 solder vacuum brazing made ??. The analysis showed that the fracture crack and fracture , fracture occurs at the brazing rounded roots as a high-stress , low -cycle fatigue fracture . Then fracture occurs from mechanical factors and metallurgical factors analyzed , the study shows that , brazing rounded roots presence of stress concentration and tissue containing brittle compound is the main reason to break . Further, the excessive dissolution of the base material and the base material crystal grains grow to a certain extent shorten the fatigue life of the product . Against the fracture reason , from the cooler structure, brazing process , materials and other aspects to explore ways to improve the fatigue life of the brazed joints . The study shows that the appropriate increase in the cooling tube diameter and wall thickness can be reduced brazing fillet parts of the degree of stress concentration , to reduce the possibility of fracture occurs ; while using the low melting point of the phosphorus-containing brazing material XHBNi-5 can reduce the amount of dissolution of the base material , lower the degree of grain growth and improve the fatigue life of the solder joint , and cooler simulation member by the vibration and the reliability of the hot and cold impact test, such brazing material having a practical application of the foreground .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding process > Brazing
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