理化检验-物理分册2024，Vol.60Issue(2)：75-77,3.DOI:10.11973/lhjy-wl202402020
ZG230-450铸钢基尔试块断后伸长率不合格原因
Causes of unqualified elongation after fracture of ZG230-450 cast steel keel block
李明1
作者信息
- 1. 锦州捷通铁路机械股份有限公司 检测中心, 锦州 121116
- 折叠
摘要
Abstract
During the tensile test after normalizing of ZG230-450 cast steel keel block poured in a melting furnace,the elongation after fracture was unqualified.The causes of unqualified elongation after fracture were analyzed by means of macroscopic observation,chemical composition analysis,scanning electron microscopy and energy spectrum analysis,metallographic examination and so on.The results show that there were punctate MnS inclusions precipitated along the grain boundary of primary austenite in the tensile sample,which weakened the grain boundary bonding force.Under the action of tensile load,the crack propagated along the grain boundary of primary austenite,forming a mixed stone fracture of transgranular dimple and intergranular dimple,resulting in unqualified elongation after fracture of the material.关键词
ZG230-450铸钢/基尔试块/MnS夹杂物/混合型石状断口/断后伸长率Key words
ZG230-450 cast steel/keel block/MnS inclusion/mixed stone fracture/elongation after fracture分类
通用工业技术引用本文复制引用
李明..ZG230-450铸钢基尔试块断后伸长率不合格原因[J].理化检验-物理分册,2024,60(2):75-77,3.
