铝合金H形截面板筋件淬火过程热力耦合数值模拟Coupled thermal-mechanical simulation on quenching of aluminum alloy H-shaped section plate reinforced part
李杰;周杰;郑斯佳;赵天生;周峻峰;向伟;翟瑞志;
摘要(Abstract):
基于有限元法处理复杂非线性问题的强大功能,建立铝合金H形截面板筋件淬火过程的热力耦合分析模型,研究在转移和淬火过程中其温度场和应力场的变化以及淬火结束后残余应力的分布规律。结果表明:铝合金H形板筋件转运过程温降幅度较小,所产生的热应力也很小;在淬火过程中,锻件前15 s温度梯度很大,随后趋于平缓;锻件心部金属应力状态由三向受压应力向三向受拉应力转变,表面金属由三向受拉应力向压应力转变,在淬火后45 s,表部和心部热应力逐渐趋于平稳;淬火终了阶段,锻件表部和心部温度趋于一致,残余应力成外部受拉应力、心部受压应力的格局,在锻件的筋部及筋部与腹板过度连接段受最大残余应力。模拟结果印证实际生产,并为后续残余应力消减提供理论依据。
关键词(KeyWords): 铝合金;H形截面板筋件;淬火;残余应力
基金项目(Foundation): 国家自然科学基金(51575067);; 重庆市基础与前沿研究计划项目(cstc2015jcyj A70011)
作者(Author): 李杰;周杰;郑斯佳;赵天生;周峻峰;向伟;翟瑞志;
Email:
DOI: 10.14024/j.cnki.1004-244x.20170907.006
参考文献(References):
- [1]LIU S,ZHONG Q,ZHANG Y,et al.Investigation of quenchsensitivity of high strength Al-Zn-Mg-Cu alloys by time-tem-perature-properties diagrams[J].Materials&Design,2010,31(6):3116-3120.
- [2]SHIN J,KIM T,KIM D,et al.Castability and mechanical prop-erties of new 7xxx aluminum alloys for automotive chassis/body applications[J].Journal of Alloys and Compounds,2017,698:577-590.
- [3]XU L,DAI G,HUANG X,et al.Foundation and application ofAl-Zn-Mg-Cu alloy flow stress constitutive equation in fric-tion screw press die forging[J].Materials&Design,2013,47:465-472.
- [4]张允康,许晓静,罗勇,等.7075铝合金强化固溶T76处理后的拉伸与剥落腐蚀性能[J].稀有金属材料与工程,2012(S2):612-615.
- [5]王辉,罗应兵,PETER Friedman,等.高强度铝合金7075的温成形性能(英文)[J].Transactions of Nonferrous Metals So-ciety of China,2012(1):1-7.
- [6]YANG W,JI S,ZHANG Q,et al.Investigation of mechanicaland corrosion properties of an Al-Zn-Mg-Cu alloy under vari-ous ageing conditions and interface analysis of eta′precipitate[J].Materials&Design,2015,85:752-761.
- [7]LADOS D A,APELIAN D,WANG L.Minimization of residu-al stress in heat-treated Al-Si-Mg cast alloys using uphillquenching:mechanisms and effects on static and dynamicproperties[J].Materials Science and Engineering A,2010,527:3159-3165.
- [8]ROBINSON J S,TANNER D A.Reducing residual stress in7050 aluminum alloy die forgings by heat treatment[J].Jour-nal of Materials Processing Technology,2008,130:1-8.
- [9]陈昌麒,刘培英,周铁涛,等.铝合金热处理计算机模拟的一些进展[J].材料热处理学报,2001,22(1):56-57.
- [10]范桂彬,张文尚.有机淬火介质在7075铝合金上的应用[J].材料工程,1994(11):34-35.
- [11]董瑞强.航空铝合金残余应力引起构件变形的数值模拟[D].浙江:浙江工业大学,2004.
- [12]柯映林,董辉跃.7075铝合金厚板预拉伸模拟分析及其在淬火残余应力消除中的应用[J].中国有色金属学报,2004,14(4):641-642.