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采用弛豫控制析出+加速冷却(RPC+ACC)和超快速冷却+加速冷却(UFC+ACC)2种不同冷却工艺试制低裂纹敏感性钢板,结合显微硬度、SEM及TEM技术分析了冷却工艺对显微组织及力学性能的影响。结果表明:RPC+ACC工艺试样的屈服强度和抗拉强度比UFC+ACC工艺高170 MPa和65 MPa,而且维持了相同的冲击韧性。获得含有大量位错胞的板条贝氏体组织,且不同尺寸的板条贝氏体被亚结构或位错墙分割,出现相互交错排列是RPC+ACC冷却工艺提高强度的主要机制。
The low crack-susceptibility steel plates were manufactured by two different cooling technologies: relaxation controlled precipitation + accelerated cooling (RPC + ACC) and ultra-rapid cooling + accelerated cooling (UFC + ACC). The microhardness, SEM and TEM techniques were used to analyze the cooling process Effect on microstructure and mechanical properties. The results show that the yield strength and tensile strength of the RPC + ACC process specimen are 170 MPa and 65 MPa higher than those of the UFC + ACC process, respectively, and the same impact toughness is maintained. Obtaining a lath bainitic structure containing a large number of dislocated cells, and different sizes of lath bainite being subdivided into sub-structures or dislocation walls, the staggered arrangement is the main mechanism for enhancing the strength of the RPC + ACC cooling process.