摘要
为探究冷却速率对非调质钢高温性能的影响,运用Gleeble-1500高温拉伸试验机研究了不同冷却速率(0.1~3.0℃/s)以及复合冷却模式对其高温力学性能的影响,并且采用热膨胀仪研究了冷却速率对非调质钢固态相变行为的影响。结果表明:采用“先强后弱”冷却模式(3.0℃/s+0.5℃/s)较强冷(3.0℃/s)模式,钢的热塑性整体得到提升,甚至无明显塑性凹槽;而采用“先弱后强”冷却模式(0.5℃/s+3.0℃/s)较单一弱冷(0.5℃/s)模式在奥氏体区钢的热塑性略有降低。冷却速率增大后,奥氏体转变的热膨胀速率由0.1℃/s时的0.8×10^(-5)s^(-1)增大至1.0℃/s时的4.6×10^(-5)s^(-1),而线性膨胀系数α_(line)峰值从5.70×10^(-5)℃^(-1)降低至3.25×10^(-5)℃^(-1)。
To investigate the effect of cooling rate on the high-temperature properties of non-quenched and tempered steel,the effects of different cooling rates(0.1-3.0℃/s)and composite cooling modes on the high-temperature mechanical properties of the tested steel were investigated using Gleeble-1500 high-temperature tensile tests.The effect of cooling rate on the solid phase transformation behavior of the non-quenched and tempered steel was also investigated using a thermal expansion instrument.The results show that using the"strong before weak"cooling mode(3.0℃/s+0.5℃/s)compared to the strong cooling(3.0℃/s)mode,the overall hot ductility of the steel is improved,and there is even no obvious plastic groove.The use of the"weak before strong"cooling(0.5℃/s+3.0℃/s)mode slightly reduces the hot ductility at austenitic zone compared to the single weak cooling(0.5℃/s)mode.Increasing the cooling rate,the thermal expansion rate of austenite transformation is increased from 0.8×10^(-5)s^(-1)at 0.1℃/s to 4.6×10^(-5)s^(-1)at 1.0℃/s,while the peak linear expansion coefficient α_(line)is decreased from 5.70×10^(-5)℃^(-1)to 3.25×10^(-5)℃^(-1).
作者
王超
邹雷雷
李明
陈军
Wang Chao;Zou Leilei;Li Ming;Chen Jun(State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China;Steelmaking Division,Shougang Jingtang Iron and Steel Co.,Ltd.,Tangshan Hebei 063210,China;Research Institute of Nanjing Iron&Steel Co.,Ltd.,Nanjing Jiangsu 211500,China;Technical Center,Hunan Valin Xiangtan Iron&Steel Group Co.,Ltd.,Xiangtan Hunan 411100,China)
出处
《金属热处理》
北大核心
2025年第12期139-144,共6页
Heat Treatment of Metals
关键词
冷却速率
非调质钢
高温性能
固态相变
热塑性
cooling rate
non-quenched and tempered steel
high-temperature properties
solid phase transformation
hot ductility
