A Study of High Temperature Mechanical Properties of Lead-bearing Free-Cutting Low Alloy Steel

• Main Authors: Shyh-yii Wuu, 武世乙
• Other Authors: Chun-Kan Hou
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/41097149689529609573

碩士 === 國立雲林科技大學 === 機械工程技術研究所 === 87 === A Study of High Temperature Mechanical Properties of the Lead-bearing Free-Cutting Low Alloy Steel Student:Shyh-Yii Wuu Advisor: Dr.Chun-Kan Hou Institute of Mechanical Engineering National Yunlin University of Science and Technology ABSTRACT The high temperature mechanical properties of five lead-bearing SCM420 low alloy steels were studied. It was found that yield and tensile strength had a maximum value at 327℃and then decreased with increasing temperature and leveled off at700℃. On the contrast,elongation and reduction of area had a minimum at 327℃ and increased with increasing temperature. However,they rapidly decreased if temperature higher than 700℃. In 400℃~700℃,both elongation and reduction of area decreased with increasing lead sulfur contents .At800℃Yield and tensile strength increased with increasing strain rate.In300℃~400℃,the CVN had a minimum and decreased with increasing lead and sulfur contents. In 950℃~1250℃,yield and tensile strength decreased with increasing temperature. Elongation and reduction of area increased with temperature and decreased with increasing lead and sulfur contents. (Keyword:high temperature mechanical properties,free-cutting low alloy steel,strain rate ,elongation,reduction of area,strength)