The influence of heat treatment strength on Cr-Mo steel -A case study of bicycle spindle

• Main Authors: Huang-Chi Chen, 陳皇吉
• Other Authors: Pai-Chung Tseng
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/06961999969993070417

碩士 === 國立中興大學 === 機械工程學系所 === 96 === Heat treatment process is often used to improve mechanical properties of components. Various heat treatment processes have different influences on material. This paper is to show the influences of strength on Cr-Mo Steel between austempering and quenching-tempering heat treatment processes, with the use of bicycle spindles as the experimental subject. During the experiment austempering process involves 860℃ austenizing temperature.360℃ austempering. And 60-minute austempering time condition. An average maximum load of 6363.67kg was achieved, resulting 65901.33kg-mm total torque. Other hand, quenching- tempering heat treatment process involves 880℃ quenching temperature, tempering at 530℃, for 20-minute tempering criteria. Maximum load, in average, was 4605kg, resulting 50559.67kg-mm total torque. After comparing the experiment data gathered between Austempering and quenching- tempering processes, we discover that austempering results 1758.67kg increase in maximum load. The increase was about 38.2%. Results 15341.66kg-mm increase in total torque. The increase was about 30.34% Therefore, a Cr-Mo Steel bicycle spindle with austempering heat treatment can have better strength in terms of maximum load and total torque. During the experiment minimum deformation involves 760℃ austenizing temperature.200℃ austempering. And 3.85mm thickness of spindle condition. An average minimum deformation of 1.08mm was achieved, the increase was 0.81mm than before heat treatment.