摘要
研究了Ｐ／ＭＦＧＨ９５合金在１１２０℃固溶后以不同冷却速度（１２，２３，５６℃／ｓ）冷却，以及在１１６０℃固溶后缓冷（４℃／ｍｉｎ）到１１２０℃二次固溶后以１２℃／ｓ冷却的显微组织、力学性能和裂纹扩展速度。实验结果表明，１１２０℃固溶后随冷却速度加快，６５０℃的屈服强度和持久寿命增加，裂纹扩展速率提高。在１１６０℃＋１１２０℃二次固溶热处理后，因晶粒增大并产生部分弯曲晶界，６５０℃屈服强度只降低１３０ＭＰａ（约１２％），而裂纹扩展速率降低１０倍，持久寿命提高近两倍，并且消除了合金的缺口敏感性。
The microstructure,mechanical properties and crack growth rate of P/M superalloy FGH95 at 1120℃,the cooling rate of 12℃/s,23℃/s,56℃/s,and 1160℃4℃/min1120℃,the cooling rate of 12℃/s solution treatment are studied.The yield strength,creep rupture time and crack growth rate at 650℃ are steadily rising along with increasing rate of cooling at 1120℃ solution treatment.Because of grain growth and bending grain boundary,650℃ yield strength decreases 130MPa (about 12%),crack growth rate decreases by a factor of 10,creep rupture time has doubled,and there is no notch sensitivity at 1160℃4℃/min1120℃ solution treatment.
