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研究了核电压力容器用钢SA533B显微组织的变化对其力学性能的影响,尤其对韧性的影响。显微分析结果表明,该钢板的组织主要为粒状贝氏体及少量多边形铁素体。通过对调质态(QT)和模拟焊后热处理(SPWHT)态SA533B钢板的常规力学性能、不同温度的夏比冲击韧性(KCV)及断裂韧度(KJC)的深入研究,结果表明SA533B厚钢板经SPWHT升高了韧脆转变温度,降低了冲击韧性及断裂韧度,但SPWHT对常规力学性能无显著的影响。扫描电镜及电子探针分析仪分析表明,经模拟焊后热处理SA533B板材组织中的析出相有不同程度长大且有钼的析出,板材的韧性降低与微观组织中的析出相和钼的析出密切相关。
The effect of the change of the microstructure of the steel SA533B on the mechanical properties of the nuclear pressure vessel, especially the toughness was studied. The results of microscopic analysis show that the microstructure of the steel is mainly granular bainite and a small amount of polygonal ferrite. The conventional mechanical properties of SA533B steel after quenched and tempered (QT) and simulated post-weld heat treatment (SPWHT), KCV and KJC at different temperatures were studied. The results show that SA533B steel plate SPWHT increased ductile-brittle transition temperature, decreased impact toughness and fracture toughness, but SPWHT had no significant effect on conventional mechanical properties. Scanning electron microscopy and electron probe analyzer analysis showed that the SA533B plate after simulated post-heat treatment of the precipitation phase have different degrees of growth and the precipitation of molybdenum, sheet toughness and microstructure of precipitates and molybdenum precipitation close Related.