珠钢电炉-薄板坯连铸连轧流程VN微合金钢组织性能研究  

TSCR BASED MICROSTRUCTURE AND PROPERTIES OF VN MICROALLOYED STEEL

作　　者：沈训良[1] 陈麒琳[1] 高吉祥[1] 

机构地区：[1]广州珠江钢铁有限责任公司,广东广州510730

出　　处：《冶金丛刊》2011年第4期13-14,18,共3页Metallurgical Collections

摘　　要：阐述了珠钢电炉-薄板坯连铸连轧流程VN微合金钢钒的析出规律、微观组织特征和强化机理。研究表明:在电炉-薄板坯连铸连轧流程采用VN微合金化,铸坯中析出以钒(C,N)为主,并有少量TiN或(Ti,V)(C,N)复合析出,平均粒度大约为40nm,热连轧开始前铸坯中大量存在的钒(C,N)能够抑制后续热连轧过程中变形奥氏体再结晶晶粒长大,使铁素体组织超细化;强化机制以细晶强化为主、沉淀强化为辅;采用VN微合金化技术开发的550MPa级VN微合金钢组织细化至3.0～4.0μm,产品具有良好的综合性能。This paper discussed the precipitation rule of V, microstructure characteristics and strengthening mechanism of VN microalloyed steel produced by TSCR process in Zhujiang Steel. The research showed that the great quantity of V（C, N） precipitated with less TiN or （Ti, V） （C, N） were found in the slab of VN microalloyed steel, and the average grain size was about 40nm. Calculations show that these precipitates could inhibit the growth of deformed austenite in the subsequent hot rolling process. The ferrite grain size of 550MPa VN microalloyed steel was 3.0 - 4.0μm. The products have good comprehensive performance.

关 键 词：薄板坯连铸连轧 VN微合金化 细晶强化 

分 类 号：TG142.1[一般工业技术—材料科学与工程]