Summary of GH90 alloy characteristics and application fields. The alloy is aging, deformation of reinforced nickel-based superalloy contain high amounts of cobalt and a variety of reinforcement element, the alloy in 815 ~ 815 ℃ has higher tensile strength and good creep resistance, oxidation resistance and corrosion resistance, under the effect of cold hot alternately repeatedly has high fatigue strength and good formability and weldability. Used for turbine engine turbine disk, blade, high temperature fastener, clamp, sealing ring and the elastic element, etc.
GH90合金钢 特性及应用领域概述:该合金是时效强化镍基变形高温合金,含有较高量的钴及多种强化元素,该合金在815~870℃有较高的抗拉强度和抗蠕变能力、良好的抗氧化性和耐腐蚀、在冷热反复交替作用下有较高的疲劳强度以及良好的成形性和焊接性。用于涡轮发动机涡轮盘、叶片、高温紧固件、卡箍、密封圈及弹性元件等。
GH90金相组织结构:GH90合金主要强化相是γ'-Ni3(Ti、Al),在晶内以大小不同的方形颗料关析出,在晶界上也可以见到这种形状的γ'相,碳化物在晶界上呈不连续的链状析出。
GH90工艺性能与要求:
1、该合金在锻造时易产生内裂,允许重锤打击,不允许低温倒棱。钢锭装炉温度不高于700℃,最终加热温度1150℃±10℃,开锻温度不低于1060℃,终锻温度不低于950℃。
2、该合金的晶粒度平均尺寸与锻件的变形程度、终锻温度密切相关。
3、合金在固溶状态可进行惰性气体保护钨极电弧焊及闪光对焊。