摘要
在Gleeble-3800热模拟试验机上,测定了含Mo低碳微合金钢在不同冷却速度下连续冷却时的膨胀曲线,利用热膨胀法并结合金相-硬度法,测定了该钢的连续冷却转变曲线(CCT曲线);研究了冷却速度对该钢组织及硬度的影响。结果表明,在所研究的冷却速度范围内,相变产物均含有贝氏体组织;当冷却速度小于10℃/s时,相变产物含有一定量的铁素体;当冷却速度减小到1℃/s以下时,相变产物除铁素体外也含有少量的珠光体;当冷却速度大于30℃/s时,相变产物中出现马氏体组织;当冷却速度为10～30℃/s时,获得贝氏体组织。动态CCT曲线的测定为该钢种生产中控制轧制工艺和控制冷却工艺的制定提供依据。
The dilatometric curves of low-carbon micro-alloyed steel with Mo at different cooling rates were detected on Gleeble-3800 thermo-mechanical simulator. The CCT curves of hot deformation were determined using thermal dilation measurement, and referencing microstructure observation and hardness measurement. The influences of cooling rate on microstructure and hardness of the steel were studied. The results show that bainite structure is obtained in any cooling rate. When the cooling rate is below 10 ℃/s, there is a certain mount of ferrite; When the cooling rate is below 1℃/s, there is a little pearlite besides ferrite; When the cooling rate is over 30 ℃/s, there is martensitic structure; when the cooling rate is in the range of 10-30℃/s, there is almost totally bainite structure. All these provide the references for productive practice to customize the parameters of rolling and cooling.
出处
《热加工工艺》
CSCD
北大核心
2008年第22期37-39,共3页
Hot Working Technology
关键词
含Mo低碳微合金钢
热模拟
膨胀法
金相-硬度法
CCT曲线
low-carbon micro-alloyed steel with Mo
thermo-mechanical simulation
dilatometric test
metallographic hardness analysis
CCT curve
