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球铁兼有强度（＞９００ＭＰａ）和伸长率（＞１０%）时,要求其基体组织由针状铁素体和为碳所饱和（１．８%～２．２%）的稳定奥氏体所组成。这一基体组织是复相的,全称为奥氏体-铁素体组织,简称为奥-铁体。早期我国研究者错把奥铁体中铁素体称作贝氏体型铁素体或上贝氏体。其?
When the ductile iron has both strength (> 900 MPa) and elongation (> 10%), the ductile iron requires that its matrix be composed of acicular ferrite and stable austenite saturated with carbon (1.8% -2.2%) Composed of. This matrix organization is complex phase, all called austenite - ferrite organization, abbreviated as Austria - iron body. Early Chinese researchers mistook the ferrite ferrite in the form of bainitic ferrite or upper bainite. its?