凝固组织遗传性及其在缺陷分析中的应用  

Heredity of solidification microstructure and its application in defects analysis

作　　者：王雷 麻晗 

机构地区：[1]江苏省(沙钢)钢铁研究院,江苏张家港215625

出　　处：《金属热处理》2015年第6期183-185,共3页Heat Treatment of Metals

基　　金：张家港市科技攻关计划项目(ZKG1013)

摘　　要：连铸过程中由于热过冷与成分过冷会在连铸坯内生成柱状晶及树枝晶,在这些柱状晶与树枝晶间形成晶间偏析。以一种高碳钢为对象,研究了连铸坯组织对最终产品的影响。结果表明,晶间偏析通过加热及热轧过程并不能完全消除,通过随后的深加工遗传到最终产品中,对产品性能造成不利影响。采用苦味酸腐蚀可以直观显示连铸坯热轧前后的枝晶形貌,且可以利用枝晶形貌分析轧制过程中缺陷来源。Columnar and dendritic crystallines would form during continuous casting process due to supercooling and constituent supercooing, and intercrystalline segregation would form between columnar and dendritic crystals. Taking some high-carbon steel as an example, effect of continuous casting billet organization on the final product was studied. The results show that intercrystalline segregation couldn’t be eliminated thoroughly by heating and hot rolling, remain in final product, and deteriorate the mechanical property of the final product. The intercrystalling segregation can be revealed clearly by picric acid etchant, and be used to analyze the origination of defects during hot rolling.

关 键 词：凝固组织 晶间偏析 遗传 表面缺陷 

分 类 号：TG249.7[金属学及工艺—铸造]