Effect of Coiling Temperature on Kinetics of Austenite Formation in Cold Rolled Advanced High Strength Steels
Effect of Coiling Temperature on Kinetics of Austenite Formation in Cold Rolled Advanced High Strength Steels
复制标题
卷取温度对冷轧先进高强度钢奥氏体形成动力学的影响
DOI：
10.4028/www.scientific.net/msf.706-709.2112
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
O. Girina
中科院分区：
文献类型：
--
作者：
R. Mohanty;O. Girina
以实验室加工的Ti/Nb微合金化低碳0.08C-2.0Mn-Cr-Mo钢为材料，系统研究了热轧初期组织对冷轧及退火后奥氏体形成和分解动力学的影响。采用卷取温度作为热轧的主要参数，得到了不同类型的热轧组织。用膨胀仪和连续退火模拟器分别进行了奥氏体形成研究和退火模拟。研究发现，卷取温度对全硬材料连续退火过程中发生的铁素体再结晶、连续加热时奥氏体形成和冷却时奥氏体分解等过程有影响。降低卷取温度加速了铁素体的再结晶和奥氏体的形核，形成了细化的铁素体-马氏体组织。研究了连续退火后初始热轧组织对最终力学性能的影响。
A systematic experimental investigation was conducted using lab processed low carbon 0.08C-2.0Mn-Cr-Mo steel microalloyed with Ti/Nb to evaluate the influence of initial hot-rolled microstructures on the kinetics of austenite formation and decomposition after cold-rolling and subsequent annealing. Coiling temperature as a major hot rolling parameter was used to obtain different types of hot-rolled microstructures. Dilatometer and continuous annealing simulator were employed for austenite formation studies and annealing simulations, respectively. It was found that the coiling temperature affects the processes occurring during heat treatment in continuous annealing lines of full hard material: ferrite recrystallization, austenite formation during continuous heating and austenite decomposition during cooling. A decrease in coiling temperature accelerates the recrystallization of ferrite and nucleation of austenite, which results in formation of refined ferrite-martensite structure. The effect of initial hot rolled structure on final mechanical properties after continuous annealing was also investigated.