摘要
超快速加热工艺由于高效和经济的优点而受到广泛的关注,为了研究该工艺对冷轧IF钢组织和性能的影响,设计了两类超快速加热工艺--直接加热和预热工艺,特别地与连续退火工艺进行了比较。与870℃保温270 s的连退样品相比,以200~500℃/s加热至870℃可明显细化IF钢晶粒,采用500℃/s超快速加热能够明显提高屈服强度,如抗拉强度可达约300 MPa,而伸长率依然保持在约43%。相比于直接加热,在引入400℃的预热段后晶粒可进一步细化,同时由于回复消耗存储能导致再结晶温度显著提高;然而,预热超快速加热工艺会产生{110}<110>织构,并降低了γ织构强度,导致在拉伸变形过程中容易发生减薄进而导致颈缩提前,因而降低了塑性。
Ultrafast heating(UFH) process has attracted a wide attention due to its high efficiency and economic advantages. To investigate the influence of UFH on the microstructural evolution and mechanical performance of the cold-rolled IF steel sheet, two types of UFH processes, i.e. the direct UFH and a preheating stage were performed. Compared with the conventional continuous annealing(CA) process at 870 ℃ for 270 s, the direct UFH process at 200-500 ℃/s to 870 ℃ could effectively refine the grain sizes. In particular, the UFH at 500 ℃/s could obviously improve the yield strength, for example the tensile strength approximately reached 300 MPa, while the total elongation remained 43%. Compared with direct heating, the grains can be further refined after the introduction of 400 ℃ preheating section, and the recrystallization temperature can be significantly increased due to the recovery consumption of storage. However, the preheating stage also caused {110}<110> texture appear and the weaker texture strength, leading to thinning in the process of stretch deformation, which resulted in the necking advance, thus reducing the plasticity.
作者
韩建胜
温鹏宇
罗海文
HAN Jian-sheng;WEN Peng-yu;LUO Hai-wen(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《中国冶金》
CAS
北大核心
2020年第5期42-46,69,共6页
China Metallurgy
基金
国家重大国际(地区)合作研究项目资助项目(51861135302)
国家自然科学基金资助项目(51831002)
中央高校基本科研业务费专项资金资助项目(FRF-TP-18-002C2)。
关键词
IF钢
超快速加热
预热
力学性能
再结晶
织构
IF steel
ultra-fast heating
pre-heating
mechanical properties
recrystallization
texture
作者简介
韩建胜(1992—),男,硕士生,E-mail:ustbhanjiansheng@163.com;通讯作者:罗海文(1972—),男,博士,教授,E-mail:haiwenluo@126.com。
