理化检验-物理分册2024，Vol.60Issue(8)：45-48,4.DOI:10.11973/lhjy-wl230262
QT500-7球墨铸铁汽车制动钳与支架反白口产生原因
Causes of inverse chill of QT500-7 nodular cast-iron automobile brake caliper and bracket
方元 1常立忠2
作者信息
- 1. 安徽工业大学 冶金工程学院,马鞍山 243002||芜湖伯特利汽车安全系统股份有限公司,芜湖 241009
- 2. 安徽工业大学 冶金工程学院,马鞍山 243002
- 折叠
摘要
Abstract
Two kinds of inverse chill defects with different characteristics appeared in the daily inspection of a QT500-7 nodular cast-iron automobile brake caliper and bracket.The causes of inverse chill defects were analyzed by means of macroscopic observation,chemical composition analysis,metallographic examination,microhardness test,scanning electron microscopy and energy spectrum analysis.The results show that the composition segregation was the main reason for the formation of the inverse chill defect of the brake caliper sample,and the composition segregation and inoculation recession were the main reasons for the formation of the inverse chill defect of the bracket sample.There was segregation of anti-graphitization elements in the brake caliper sample,which increased the supercooling tendency of molten iron and formed the inverse chill defect.There was inoculation recession in the central area of the bracket sample,and the segregation of anti-graphitization elements made the sample form the inverse chill defect.关键词
QT500-7球墨铸铁/反白口/成分偏析/孕育衰退/石墨化Key words
QT500-7 nodular cast-iron/inverse chill/composition segregation/gestation recession/graphitization分类
矿业与冶金引用本文复制引用
方元,常立忠..QT500-7球墨铸铁汽车制动钳与支架反白口产生原因[J].理化检验-物理分册,2024,60(8):45-48,4.
