先进金属材料制备成形与质量管控理论技术研究

Research on theory and technology of advanced metal material preparation,forming and quality control

为解决先进金属材料制备成形及表征基础理论研究薄弱的问题,从先进金属材料制备成形基础理论以及金属材料服役全生命周期质量管控方面,对先进金属材料本构关系、制备和疲劳理论等进行了分析阐述。为解决金属材料的强各向异性行为所导致的塑性成形问题,研究了多向复合加载下强各向异性金属塑性流动规律、异构结构低碳超高锰低温钢的低温形变与相变机理,提出了联系宏细微观损伤机理的多尺度应力场强理论,吻合高周疲劳失效现象。建立了冲击作用下金属材料裂纹动态失效理论,揭示了其损伤机理,是新型应力场强理论的重要补充,实现了复杂服役条件下结构件疲劳强度的高精度预测。对镍基单晶涡轮叶片在不同工况下的蠕变和疲劳损伤展开了研究,揭示了镍基单晶合金晶体各向异性和晶体取向敏感性的微细观机理,并且分析了结构对构件性能的影响。

To solve the problems of weak basic theoretical research on preparation,forming and characterization of advanced metal material,the constitutive relationship,preparation and fatigue theory of advanced metal materials were analyzed and elaborated from the aspects of the basic theory of preparation and forming of advanced metal materials and the quality control of metal materials throughout their service life cycle.To solve the plastic forming problems caused by strong anisotropic behavior of metal materials,the plastic flow law of strong anisotropic metals under multi-directional composite loading and the mechanism of low-temperature deformation and phase transformation of low carbon ultra-high manganese low-temperature steel with heterogeneous structure were studied.A multi-scale stress field strength theory was proposed,which was related to the micro,macro and microscopic damage mechanism,and fitted the high-cycle fatigue failure phenomenon.The dynamic crack failure theory of metal materials under impact effect was established and the damage mechanism was revealed,which is an important supplement to the new stress field strength theory and the fatigue strength of structural parts under complex service conditions can be predicted with high accuracy.The creep and fatigue damage of nickel-based single crystal turbine blades under different working conditions were studied and the microscopic and micro mechanisms of crystal anisotropy and crystal orientation sensitivity of nickel-based single crystal alloys were revealed,and the influence of structure on component performance was analyzed.