DC06深冲开裂原因分析

通过使用光学显微镜、 X射线衍射仪和拉伸试验机等分析手段，对 DC06钢板冲压成汽车零部件过程中的开裂原因进行了分析。结果表明：冲压件 45°方向塑性应变比 r值低于标准下限，深冲有利织构 {111}〈110〉和{111}〈112〉少，导致板材变形不均匀，深冲性能差，在 45°方向应力集中区域首先产生开裂。在此基础上，提出改进措施，研究织构在热轧、冷轧及再结晶退火等加工过程中的产生及变化规律，优化生产工艺，对改进后的 DC06钢板进行测试，结果显示： DC06深冲板形成了较强的 γ纤维织构， r值升高， Δr小，板材成型性能提高。

CauseanalysisofDC06deepdrawingcrack

The causes of cracking during the process of stamping DC06 steel into automotive parts were analyzed by meansofopticalmicroscopy，X-raydiffractmeterandtensiletestingmachine.Theresultsshowedtheplasticstrainratio r of the stamping part in 45° direction was lower than the standard lower limit and the deep drawing advantage texture {111}〈110〉and{111}〈112〉wasless，leadingtothenon-uniformdeformationofthesheetandbaddeepdrawingperfor-mance.As a result，cracking first occured in the stress concentration region in the 45°direction. On this basis，the im-provementmeasureswereputforwardtostudythegenerationandvariationofthetextureinthehot-rolling，cool-rolling and recrystallization annealing process，optimize the production process，and test the improved DC06 steel sheet. The results showed that the DC06 deep drawing plate had a strong γ fiber texture，higher r-value，lower Δr，so the deep drawingperformancewasimproved.