The Study of Spheroidizing Quality of40ACR Wire Coil

• Main Authors: Lu Ming Tsung, 呂明宗
• Other Authors: 楊至誠
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/55351589438168443157

碩士 === 高苑科技大學 === 機械與自動化工程研究所 === 99 === This study is aimed at 40ACR wire coil to investigate the influence of spheroidized temperature and cold work on spheroidized quality. A series of tests is conducted on the wire coil with various section-reduction ratio 0~60%, then with the treatment of different sphereoidized temperature 680~760C. It is revealed experimentally that the cold work of wire-drawing is able to make for spheroidization. The wire-drawing causes the interior defects and the energy stored in the wire, which is able to be released to aid the material spheroidizing as annealing. The more cold-work on the wire makes more carbide breaking and makes carbon spreading in the wire to promote the spheroidization quality. The wire with greater section-reduction ratio is able to be spheroidized with the temperature slightly below AC1. However, when the section-reduction ration is over 40%, the variation of spheroidization is not obvious and furthermore, the hardness and tensile strength are both increased. The spheroidizing temperature of carbon steel wire is ranged between 680 and 760C. When the treating temperature is high, there are more homogenized austenite in the material so that the effect of spheroidization is not obvious. It is revealed experimentally that, for 40ACR wire coil, the spheroidized quality is best when the section-reduction ration is 30~40% and spheroidizing temperature is 740C since the hardness and tensile strength are the smallest.