摘要
利用宏观检验、化学成分分析、力学性能测试及金相检测等方法对Q235B H型钢冷弯开裂试样进行分析。结果表明:在冷弯试验过程中,粗大的条状塑性夹杂物和点链状脆性夹杂物与基体的结合性较差,冷弯过程中夹杂物脱落或周围应力集中形成空隙或显微裂纹,随着受力状态的加强导致裂纹扩张形成冷弯开裂的裂纹源,在开裂过程中带状组织和加工痕迹加剧了裂纹的扩大。
The cold bending cracking samples of Q235B H-beam steel were analyzed by macroscopic examination,chemical composition analysis,mechanical property test and metallographic examination. The results showed that in the process of cold bending test,the bonding property between thick strip plastic inclusions and point chain brittle inclusions was poor. Due to inclusion shedding or peripheral stress concentration in cold bending test,the gaps or micro cracks were formed. With the strengthening of stress,the cracks were extended to form the source of cold bending crack.The banded structure and machining marks in the process of cracking accelerated the expansion of cracks.
作者
夏冰
陈斌
后宗保
赵志海
XIA Bing;CHEN Bin;HOU Zong-bao;ZHAO Zhi-hai(Testing Center,Maanshan Iron and Steel Co.,Ltd.,Ma'anshan 243000,China)
出处
《物理测试》
CAS
2020年第2期45-48,共4页
Physics Examination and Testing
关键词
冷弯开裂
加工痕迹
夹杂物
带状组织
cold bending cracking
machining mark
inclusion
banded structure
