摘要
FGH96合金属于难变形材料,采用等温锻造成形是其最佳成形工艺。等温锻造时模具长时间处于高温状态,由于模具十分昂贵,最佳的成形温度必须综合考虑温度对材料的成形性能和模具强度及寿命的影响。通过对等温成形过程坯料和模具的热力耦合有限元模拟,获得了FGH96合金等温锻造温度范围内模具型腔表面等效应力峰值、模具材料屈服极限、强度极限随温度的变化规律。根据模腔上的等效应力峰值最大程度地小于模具材料的屈服极限的原则,确定出FGH96合金最佳等温成形温度为1050℃左右。应用于实际生产,取得了良好的效果。
The Chinese nickel-base powder metallurgy （PM） super-alloy FGH96 is a material hard to be deformed and isothermal forging is the best forming method to it. The die for super-alloy isothermal forging is very expensive, which works under high temperature for a long time. So forming property of FGH96 and the die strength ＆ life at that temperature must be considered to determine the optimal forge temperature. A thermomechanical coupled finite element （ FE ） model has been established to study the blank workpiece and forging die during the isothermal forging process. The regularity of peak equivalent stress acted on inner surface of mould, yield limit and ultimate strength of mould material during the forging process has been gained. As the peak equivalent stress acted on inner surface of mould must be extremely less than yield limit of mould material, 1050℃has been determined to be the best deformation temperature for PM super-alloy FGH96. The practice proves good effect.
出处
《锻压装备与制造技术》
2010年第1期87-90,共4页
China Metalforming Equipment & Manufacturing Technology
基金
航空基础科学基金资助项目(03H53048)
