论文部分内容阅读
利用SEM、电子探针、纳米压痕及高温变形热模拟机,研究低碳合金钢在不同热处理工艺下组织及力学性能的变化规律。结果表明,冷却速度不同时,合金钢中贝氏体的显微组织不同。当冷却速率为0.50~1.00℃/s时,钢中组织为准多边形铁素体和粒状贝氏体;冷却速度为3.00~10.00℃/s时,组织变为针状铁素体和板条贝氏体。针状铁素体组织的相变温度为620~600℃之间;试验钢中准多边形铁素体硬度最低,板条贝氏体硬度最高,贝氏体组织的本征硬度与维氏硬度均随冷却速度的增加而增大,且基体本征硬度对合金钢维氏硬度的变化起主要作用。
SEM, electron probe, nanoindentation and high temperature deformation thermal simulator were used to study the variation of microstructure and mechanical properties of low carbon alloyed steel under different heat treatment conditions. The results show that when the cooling rate is different, the microstructure of bainite in the alloy steel is different. When the cooling rate is 0.50 ~ 1.00 ℃ / s, the microstructure of the steel is quasi-polygonal ferrite and granular bainite. When the cooling rate is 3.00 ~ 10.00 ℃ / s, the microstructure becomes acicular ferrite and laths Body. The phase transition temperature of acicular ferrite is between 620 ℃ and 600 ℃. The quasi-polygonal ferrite has the lowest hardness and the lath bainite has the highest hardness. The intrinsic and micro-Vickers hardness of bainite With the cooling rate increases, and the intrinsic hardness of the matrix Vickers hardness changes play a major role.