前言自六十年代来,双相钢问世以来,世界各国对其强韧化机制,性能控制方法,工程应用等方面进行了广泛深入的研究,但研究工作大都偏重于低屈强比(σ_a/σ_b≈0.5)奥氏体或铁素体为基,分别以铁素体和马氏体为少量相的变形双相钢,而对高届强比(σ_a/σ_b≈0.8)马氏体—铁素体铸造双相钢的研究报道甚少。事实上,低碳Cr13型钢-适当控制化学成份及工艺条件-就是典型的马氏体-铁素体双相不锈钢,为了与该钢种在 Preface Since the advent of dual-phase steel in the 1960s, various countries in the world have conducted extensive and in-depth studies on its toughening mechanism, performance control method and engineering application. However, most of the research work focuses on the low yield ratio (σ_a / σ_b ≈ 0.5) austenite or ferrite-based, respectively, a small amount of ferrite and martensite phase dual phase steel, and the high ratio of (σ_a / σ_b ≈ 0.8) martensite - iron There are few reports on the research of dual-phase steel casting. In fact, low-carbon Cr13 steel - the appropriate control of chemical composition and process conditions - is the typical martensitic - ferritic duplex stainless steel, in order to be with the steel in the