摘要
对断面280 mm×325 mm的GCr15轴承钢进行了热酸浸实验与碳偏析检测,研究了碳偏析的低倍组织形貌,探讨了V型偏析的形成机理。结果表明,偏析在铸坯纵剖面上呈V型分布,且V型偏析仅分布于等轴晶区,凝固组织与偏析的形成有密切关系;同时碳元素在铸坯皮下呈负偏析,混晶区呈正偏析。
The hot acid leaching test and carbon segregation test of GCr15 bearing steel with cross section of 280 mm ×325 mm were carried out. The morphologies of low power microstructure of carbon segregation were studied. The formation mechanism of V-type segregation was discussed. The results show that the segregation is a V-type distribution in the longitudinal section of the casting blank, and the V-type segregation is only distributed in the equiaxed crystal region, and the solidification microstructure is closely related to the formation of the segregation. At the same time, the carbon element under the skin of the billet shows negative segregation and positive segregation in the mixed crystal zone.
作者
张振学
李鹏飞
赵志刚
褚绍阳
张慧
王明林
ZHANG Zhenxue;LI Pengfei;ZHAO Zhigang;CHU Shaoyang;ZHANG Hui;WANG Minglin(National Engineering Research Center of Continuous Casting Technology,Central Iron&Steel Research Institute,Beijing 100081,China;College of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China)
出处
《热加工工艺》
北大核心
2020年第7期74-77,共4页
Hot Working Technology
关键词
轴承钢
凝固组织
V型偏析
bearing steel
solidification microstructure
V-shaped segregation
