末道次冷轧变形量对Al-Mg-Si-Cu合金织构和力学性能的影响  

Effect of cold rolling deformation amount of final pass on texture and mechanical properties of Al-Mg-Si-Cu alloy

作　　者：邱铨强 吴蔚 袁悠悠 王茹 翁瑶瑶 吴萌 QIU Quan-qiang;WU Wei;YUAN You-you;WANG Ru;WENG Yao-yao;WU Meng(School of Materials Science and Engineering,Nanjing Institute of Technology,Nanjing 211167,China)

机构地区：[1]南京工程学院材料科学与工程学院,江苏南京211167

出　　处：《材料热处理学报》2024年第1期62-69,共8页Transactions of Materials and Heat Treatment

摘　　要：通过X射线衍射、电子背散射衍射技术和拉伸测试等研究了末道次冷轧变形量对汽车车身板用Al-Mg-Si-Cu合金板材织构、晶粒形貌和力学性能的影响。结果表明:在成分和冷轧后固溶处理工艺相同的情况下,织构是决定Al-Mg-Si-Cu合金板材力学性能的主要因素。晶粒尺寸最大的33%试样反而获得了最高的抗拉强度和较低的屈强比。这是因为减小末道次冷轧变形量可以降低固溶及预时效处理状态下板材Cube和Cube+ND_(20)织构的含量,从而减少立方型织构对板材强度的损害。而末道次大变形量冷轧会促进再结晶时Copper、S和Brass织构向Cube和Cube+ND_(20)织构的转变,并抑制S织构转变成R织构,在实际生产中应当避免。Effect of cold rolling deformation amount of final pass on texture,grain morphology and mechanical properties of Al-Mg-Si-Cu alloy sheets for automotive body panels was studied by means of X-ray diffraction,electron backscatter diffraction technique and tensile testing.The results show that the texture is the main factor determining the mechanical properties of the Al-Mg-Si-Cu alloy sheets under the same composition and solution treatment process after cold rolling.The 33%sample with the largest grain size actually achieved the highest tensile strength and lower yield strength ratio.This is because reducing the cold rolling deformation amount of final pass can reduce the content of Cube and Cube+ND_(20) textures in the sheet under solution and pre aging treatment,thereby reducing the harm of cubic texture to the strength of the sheets.The final pass high deformation cold rolling will promote the transformation of Copper,S and Brass textures to Cube and Cube+ND_(20) textures during recrystallization,and inhibit the transformation of S texture into R texture,which should be avoided in practical production.

关 键 词：AL-MG-SI-CU合金 冷轧 变形量分配 织构 

分 类 号：TG146.2[一般工业技术—材料科学与工程]