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27SiMnA钢进行亚温等温淬火得到铁素体+马氏体+贝氏体(占50%)复相组织,这种组织具有理想的强韧性配合。亚温等温复相组织中的贝氏体类似低温上贝氏体(B_Ⅱ)。马氏体晶体外貌除了有条状外,还有枣核状。被强化的未溶铁素体呈不连续块状分布。马氏体和贝氏体铁素体晶体细小、马氏体和贝氏体铁素体中碳化物弥散分布以及少量薄膜状形式分布的残余奥氏体是亚温等温淬火复相组织(B+M+F)强韧化的主要原因。
27SiMnA steel isothermal quenching to obtain ferrite + martensite + bainite (50%) complex phase organization, this organization has the ideal strength and toughness with. The bainite in the sub-temperature isothermal complex phase resembles low-temperature upper bainite (B_Ⅱ). In addition to martensitic crystal appearance of the strip, there are dates core. The undissolved ferritic was discontinuous block distribution. The retained austenite with small martensite and bainitic ferrite crystals, carbide dispersed in martensite and bainitic ferrite, and a small amount of film-like distribution is the microstructure of the isothermally tempered duplex (B + M + F) toughening the main reason.