淬火分配(QP)钢塑性变形过程会诱发马氏体相变，具有高强度、高延伸率的特点，但其成形性能目前尚不清楚。通过Nakajima实验得到QP1180钢板在不同应变路径下的极限应变，采用考虑相变的晶体塑性有限元模型耦合MK理论（CPFEM-PT-MK），分析了织构演化和相变对QP1180钢板成形极限的影响。结果表明，在应变路径ζ=0.1下，QP1180钢板的极限主应变最低，CPFEM-PT-MK模型能够较好地预测QP1180钢板的成形极限；不同应变路径下QP1180钢各相的织构演化存在明显差异，不考虑织构演化时，QP1180成形极限更低；当不发生相变时，极限主应变最低点在应变路径ζ=0位置，与发生相变时显著不同，且相变并非总是提高QP1180的成形极限，而是与应变路径有关。

Quenching-partitioning (QP) steel has the combination of ultrahigh-strength and good ductility properties due to the martensitic transformation during plastic deformation. However, the formability of the QP1180 steel is still unclear. The ultimate strains of the QP1180 steel under different strain paths were obtained by Nakajima experiment. The effects of the texture evolution and phase transformation on the forming limit of QP1180 steel were analyzed by using the crystal plastic finite element model coupled with the MK theory (CPFEM-PT-MK). The results show that the ultimate principal strain of QP1180 steel is the lowest under the strain path ζ=0.1, and the established CPFEM-PT-MK model can successfully predict the forming limit of QP1180 steel sheet. The texture evolutions of the constituent phases in the QP1180 steel are different under various strain paths. According to simulation, the texture evolutions enhance the forming limit of the QP1180 steel under various strain paths. Without phase transformation, the minimum limited major strain of the QP1180 steel is located under the strain path of ζ=0, which is significantly different from that when phase transformation occurs. And the effect of phase transformation on the forming limit of the QP1180 steel is related to the strain paths.