Numerical and experimental analysis of quenching p

Authors: Qian Tang Linqing Pei Hansong Xiao

Publish Date: 2010/06/24

Volume: 17, Issue: 3, Pages: 529-536

PDF Link

Abstract

In order to obtain satisfactory mechanical properties for the cam used in highpower ship diesel engines a new quenching technology was proposed by designing a twostage quenching process with an alkaline bath as the quenching medium To demonstrate the effectiveness of the proposed new quenching technology both numerical analysis and experimental study were performed The new quenching technology was analyzed using finite element method The combined effects of the temperature stress and microstructure fields were investigated considering nonlinear material properties Finally an experimental study was performed to verify the effectiveness of the proposed new quenching technology The numerical results show that internal stress is affected by both thermal stress and transformation stress In addition the direction of the internal stress is changed several times due to thermal interaction and microstructure evolution during the quenching process The experimental results show that the proposed new quenching technology significantly improves the mechanical properties and microstructures of the cam The tensile strength the impact resistance and the hardness value of the cam by the proposed new quenching technology are improved by 43 89 and 35 compared with those by the traditional quenching technology Moreover the residual stress and cam shape deformation are reduced by 400 and 489 respectively for the cam manufactured by the new quenching technologyFoundation item Project50875268 supported by the National Natural Science Foundation of China ProjectCSTC2008AB3057 supported by Foundation of Chongqing Science and Technology Commission China Project108107 supported by the Key Project of Ministry of Education of China Project50925518 supported by the National Science Fund for Distinguished Young Scholars

Keywords: