对一种低碳硅锰钢进行TMCP实验,获得了不同铁素体形态的铁素体/贝氏体双相钢(FB钢),研究了FB钢在单轴拉伸下的变形行为及断裂特性,结果表明:在均匀塑性变形阶段,FB钢的瞬时加工硬化指数n*值与真应变ε的关系曲线可分为n*值较高、n*值随ε缓慢下降以及n*值随ε迅速下降三个阶段,与等轴铁素体/贝氏体双相钢相比,准多边形铁素体/贝氏体双相钢的强度和低应变区的n*值均比较高,FB钢拉伸试样颈缩区的孔洞或微裂纹产生在F-B相界面附近和铁素体内,有助于减弱裂纹尖端附近的局部应力集中,改善钢材的抗裂纹扩展性能.
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