Analysis of fractured exhaust valve

Sujata, M and Bhaumik, SK (2003) Analysis of fractured exhaust valve. Project Report. National Aerospace Laboratories, Bangalore.

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Abstract

A number of valves were found to have fractured in the stem portion during the straightening process after welding and tempering operations. The broken valves along with a few unbroken valves from the same lot of manufacturing were sent to the laboratory for analysis. Examination revealed that the stem of the valves got surface hardened to as high as 530 HV. Due to this high surface hardness, the stem portion of the valves might have fractured during the straightening process. It appears most probable that during heat treatment, the furnace had carburising atmosphere, which resulted in surface hardening of the stems.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: IC engine;exhaust valve;carburized case;overload
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Materials Science Division, Materials Science Division
Depositing User: Mrs Manoranjitha M D
Date Deposited: 07 Jul 2011 14:58
Last Modified: 07 Jul 2011 14:58
URI: http://nal-ir.nal.res.in/id/eprint/9286

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