淬火工艺对HSLA钢板截面精细组织结构的影响
发布时间：2018-10-18 06:34
【摘要】：使用Formastor热膨胀仪、ABAQUS有限元软件、金相显微镜、TEM及EBSD等手段研究了淬火冷速对35 mm厚HSLA钢板截面组织结构的影响。结果表明:淬火冷却速度对试验钢板距表面8 mm范围内的组织和性能有显著的影响。提高淬火冷速有利于提高近表面板条马氏体/贝氏体组织含量、提高位错和小角度晶界的密度以及细化板条宽度,使近表面的硬度大幅度提高。淬火冷速对试验钢板距表面8 mm到心部的组织和性能没有显著的影响。随着淬火冷速的提高,钢板表面1/4处到心部的板条尺寸、晶界特征及MA组元没有显著的差别,其硬度在同一水平波动。此外,冷却速度对大角度晶界密度、有效晶粒尺寸的影响不显著。ABAQUS模拟结果与试验钢板的硬度分布和组织分布相吻合,钢板截面冷却速度的分布决定了最终组织的转变类型和结构特征。
[Abstract]:By means of Formastor thermal expansion instrument, ABAQUS finite element software, metallographic microscope, TEM and EBSD, the effect of quenching rate on the cross section structure of 35 mm thick HSLA steel plate was studied. The results show that the quenching rate has a significant effect on the microstructure and properties of the steel plate in the range of 8 mm from the surface. The increase of quenching cooling rate is beneficial to increase the microstructure content of martensite / bainite on the near surface, to increase the density of dislocation and small angle grain boundary, and to refine the width of the lath, so that the hardness of the near surface can be greatly improved. The quenching cooling rate has no significant effect on the microstructure and properties of the steel plate from 8 mm to the center. With the increase of quenching cooling rate, there is no significant difference in the plate size, grain boundary characteristics and MA components from 1 / 4 to the center of the steel plate surface, and the hardness fluctuates at the same level. In addition, the effect of cooling rate on the large angle grain boundary density and effective grain size is not significant. The ABAQUS simulation results agree with the hardness distribution and microstructure distribution of the test plate. The distribution of cooling rate of steel plate section determines the transformation type and structure characteristics of the final microstructure.
【作者单位】： 钢铁研究总院工程用钢所;
【分类号】：TG142.1;TG161
本文编号：2278292
[Abstract]:By means of Formastor thermal expansion instrument, ABAQUS finite element software, metallographic microscope, TEM and EBSD, the effect of quenching rate on the cross section structure of 35 mm thick HSLA steel plate was studied. The results show that the quenching rate has a significant effect on the microstructure and properties of the steel plate in the range of 8 mm from the surface. The increase of quenching cooling rate is beneficial to increase the microstructure content of martensite / bainite on the near surface, to increase the density of dislocation and small angle grain boundary, and to refine the width of the lath, so that the hardness of the near surface can be greatly improved. The quenching cooling rate has no significant effect on the microstructure and properties of the steel plate from 8 mm to the center. With the increase of quenching cooling rate, there is no significant difference in the plate size, grain boundary characteristics and MA components from 1 / 4 to the center of the steel plate surface, and the hardness fluctuates at the same level. In addition, the effect of cooling rate on the large angle grain boundary density and effective grain size is not significant. The ABAQUS simulation results agree with the hardness distribution and microstructure distribution of the test plate. The distribution of cooling rate of steel plate section determines the transformation type and structure characteristics of the final microstructure.
【作者单位】： 钢铁研究总院工程用钢所;
【分类号】：TG142.1;TG161
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