不同冶金工艺深冲钢板的显微组织与力学性能对比

Comparison of Microstructure and Mechanical Properties of Deep Drawing Steel Sheet Prepared by Different Metallurgy Processes

采用OM、SEM和TEM等方法,研究了循环法真空处理(RH)-钢包炉外精炼法(LF)双联钙处理和RH单联未进行钙处理两种冶金工艺对深冲(DDQ)级钢板的显微组织、力学性能和夹杂物的影响。结果表明:双联工艺冷轧退火板的抗拉强度、屈服强度低于单联工艺的,但伸长率高于后者;双联工艺会引起钢板的增碳,影响了钢板的塑性应变比r值;双联工艺钢板中夹杂物数量更少,而且尺寸也较小。

The effects of two metallurgy processes with Ruhrstahl/Heraeus（RH）-Ladle furnace（LF） duplex calcium treatment and RH without calcium treatment on microstructure, mechanical properties and inclusion of deep draying quality（DDQ） level cold-rolled sheets were studied by means of OM, SEM and TEM. The results show that the tensile strength and yield strength of the cold-rolled annealed sheet with RH-LF duplex calcium treatment were lower than those with RH without calcium treatment, but the elongation was higher than the later. The plastic strain ratio value of r was influenced by the carburization phenomenon caused during the process of RH-LF duplex calcium treatment. And the quantity of inclusions in the steel dealed with RH-LF duplex calcium treatment was less and the inclusion size was smaller.