The result showed that the quantity and dimension of M-A islands in granular bainite has a great effect on impact toughness of CGHAZ of ultra-low carbon copper-bearing age hardening steel.

• 结果表明,粒状贝氏体中M A岛的含量和尺寸对超低碳含铜时效钢CGHAZ的冲击韧性有显著影响。