Mainly its metallographic structure consists of acicular ferrite and martensite.
钢的组织主要由针状铁素体和马氏体两相组成。
2
The results showed that the microstructure of the steel was mainly composed of fine island-like martensite and acicular ferrite, with a 27.6% of martensite volume fraction.
结果表明：试验钢的组织由细小岛状马氏体与针状铁素体为主构成，马氏体体积分数为27．6%。
3
The existence and amount of small isolated martensite between the acicular ferrite play an important role in determining the tensile strength and low temperature impact toughness of the steels.