轧制组织特征对7B50-T7751铝合金厚板断裂韧性的影响
|
摘要
针对不同热轧工艺制备的7B50-T7751铝合金厚板,通过金相显微镜、EBSD等方法对合金的组织特征进行了表征与分析,并对比分析了不同热轧工艺制备的板材的室温拉伸性能和断裂韧性。结果表明,轧制过程使板材织构呈不均匀分布,板材1/4厚度位置主要是变形织构;1/2厚度位置主要是再结晶织构,织构强度较1/4厚度位置的弱。通过较少轧制道次、提高道次变形量、提高终轧温度可以使板材在热轧过程中充分回复,释放变形储能,在后续热处理后不同厚度位置均保留变形织构。变形织构可以有效提高合金的断裂韧性和拉伸性能,同时也增加了厚板的各向异性。
The microstructure characteristics of 7 B50-T7751 thick plate after different hot rolling processes has been investigated by optical microscopy( OM) and electron back scatter diffraction( EBSD). The fracture toughness and tensile properties at room temperature have also been tested. The results indicate that the plate texture is unevenly distributed due to the rolling processes,1/4 thick position is mainly deformation texture and 1/2 thick position is primarily recrystallized texture. The texture strength of 1/2 is weaker than that of1/4. By reducing rolling passes,improving pass deformation and finishing rolling temperature,the plate can fully recover,release deformation storage energy and reserve deformation texture at different thickness positions in the rolling processes. The deformation texture can improve the fracture toughness and tensile properties effectively,and increase different directions of anisotropy.
The microstructure characteristics of 7 B50-T7751 thick plate after different hot rolling processes has been investigated by optical microscopy( OM) and electron back scatter diffraction( EBSD). The fracture toughness and tensile properties at room temperature have also been tested. The results indicate that the plate texture is unevenly distributed due to the rolling processes,1/4 thick position is mainly deformation texture and 1/2 thick position is primarily recrystallized texture. The texture strength of 1/2 is weaker than that of1/4. By reducing rolling passes,improving pass deformation and finishing rolling temperature,the plate can fully recover,release deformation storage energy and reserve deformation texture at different thickness positions in the rolling processes. The deformation texture can improve the fracture toughness and tensile properties effectively,and increase different directions of anisotropy.
引文
[1]CASSADA W,LIU J.Aluminum alloys for aircraft structure[J].Adv Mater Proc,2002(12):27.
[2]丛福官,赵刚,田妮,等.7150-T7751铝合金厚板性能的不均匀性[J].材料研究学报,2013,27(2):144-148.
[3]龚澎,郑林斌,张坤,等.7B50-T7451铝合金板材孔挤压工艺性能研究[J].航空材料学报,2011,31(4):45-50.
[4]刘蛟蛟,武岳,赖永秋,等.固溶温度对7B50铝合金组织与性能的影响[J].中国有色金属学报,2013,23(11):3100-3106.
[5]杨守杰,戴圣龙.航空铝合金的发展回顾与展望[J].材料导报,2005,19(2):76-80.
[6]CHEN J Z,ZHEN L,SHAO W Z,DAIL S L,CUI Y X.Through-thickness texture gradient in AA7055 aluminum alloy[J].Materials Letters,2008,62(1):88-90.
[7]LIU W C,RADHAKRJISHNAN B,LI Z,MORRIS J G.Through-thickness texture gradient in continuous cast AA 5052 aluminum alloy sheet[J].Mater Sci Eng A,2008,472(1):170-178.
[8]HONG S H,JEONG H T,CHOI C H,LEE D H.Deformation and recrystallization textures of surface layer of copper sheet[J].Mater Sci Eng A,1997,229(1/2):174-181.
[9]张新明,韩念梅,刘胜胆,等.7050铝合金厚板织构、拉伸性能及断裂韧性的不均匀性[J].中国有色金属学报,2010,20(2):202-208.
[10]姚宗勇,刘庆,刘伟,等.大应变量冷轧AAl050铝合金微观组织与织构的演变[J].金属学报,2009,45(6):647-651.
[11]张永皞,姚宗勇,黄光杰,等.轧制变形铝合金微观组织与织构的EBSD研究[J].材料工程,2009,28(1):43-45.
[12]陈艳霞,张建国,王泓,等.2124铝合金各向异性的EBSD研究[J].金属热处理,2011,36(5):79-82.
[2]丛福官,赵刚,田妮,等.7150-T7751铝合金厚板性能的不均匀性[J].材料研究学报,2013,27(2):144-148.
[3]龚澎,郑林斌,张坤,等.7B50-T7451铝合金板材孔挤压工艺性能研究[J].航空材料学报,2011,31(4):45-50.
[4]刘蛟蛟,武岳,赖永秋,等.固溶温度对7B50铝合金组织与性能的影响[J].中国有色金属学报,2013,23(11):3100-3106.
[5]杨守杰,戴圣龙.航空铝合金的发展回顾与展望[J].材料导报,2005,19(2):76-80.
[6]CHEN J Z,ZHEN L,SHAO W Z,DAIL S L,CUI Y X.Through-thickness texture gradient in AA7055 aluminum alloy[J].Materials Letters,2008,62(1):88-90.
[7]LIU W C,RADHAKRJISHNAN B,LI Z,MORRIS J G.Through-thickness texture gradient in continuous cast AA 5052 aluminum alloy sheet[J].Mater Sci Eng A,2008,472(1):170-178.
[8]HONG S H,JEONG H T,CHOI C H,LEE D H.Deformation and recrystallization textures of surface layer of copper sheet[J].Mater Sci Eng A,1997,229(1/2):174-181.
[9]张新明,韩念梅,刘胜胆,等.7050铝合金厚板织构、拉伸性能及断裂韧性的不均匀性[J].中国有色金属学报,2010,20(2):202-208.
[10]姚宗勇,刘庆,刘伟,等.大应变量冷轧AAl050铝合金微观组织与织构的演变[J].金属学报,2009,45(6):647-651.
[11]张永皞,姚宗勇,黄光杰,等.轧制变形铝合金微观组织与织构的EBSD研究[J].材料工程,2009,28(1):43-45.
[12]陈艳霞,张建国,王泓,等.2124铝合金各向异性的EBSD研究[J].金属热处理,2011,36(5):79-82.