以CP980钢、DP980钢、QP980钢为研究对象，采用单轴拉伸试验并结合数字图像相关技术，研究了组织特征对980 MPa级先进超高强钢单轴拉伸行为以及全局、局部成形性的影响。结果表明：QP980钢由马氏体、铁素体、残余奥氏体组织组成，在均匀变形阶段奥氏体相变产生的相变诱导塑性效应使该钢具有最优的全局成形性，但是新生马氏体相与其他相的硬度差较大，导致其局部成形性最差并形成准解理断裂；DP980钢由铁素体和马氏体组织组成，其强化机制以马氏体硬相强化和铁素体位错强化为主，全局成形性居中，同时因铁素体和马氏体之间具有一定的协调变形能力，其局部成形性较好，断裂形式主要为韧性断裂；CP980钢为铁素体、贝氏体、马氏体的多相组织，各相硬度差小，协调变形能力较强，局部成形性最好，断裂形式为韧性断裂。

Taking CP980 steel, DP980 steel and QP980 steel as research objects, the effect of microstructure characteristics on uniaxial tensile behavior and global and local formability of 980 MPa grade advanced ultra-high strength steels was studied by uniaxial tensile test and digital image correlation. The results show that QP980 steel was composed of martensite, ferrite and residual austenite; the phase transformation induced plasticity effect induced by austenite transformation during uniform deformation made the steel have the best global formability, but the hardness difference between the new martensite phase and other phases was large, resulting in the worst local formability and the formation of quasi cleavage fracture.The DP980 steel was composed of ferrite and martensite, and its strengthening mechanism was mainly martensitic hard phase strengthening and ferrite dislocation strengthening; the global formability was in the middle. Due to a certain coordination deformation ability between ferrite and martensite, the local formability of DP980 steel was good, and its fracture form was mainly ductile fracture. CP980 steel consisted of ferrite, bainite and martensite. The hardness difference of each phase was small, and the coordination deformation ability was strong; so the local formability was the best, and the fracture form was the ductile fracture.