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对一种新型高温合金DZ68的热处理工艺进行了研究。运用金相分析法确定了DZ68合金的初熔温度范围为1 240～1 260℃。利用光学显微镜、扫描电镜分析了合金不同状态的微观组织,测定了合金的持久性能。结果表明,DZ68合金的最佳热处理工艺为:1 240℃×0.5 h+1 260℃×0.5 h+1 280℃×2 h,AC+1 120℃×4 h,FC×1 h→1 080℃×4 h,AC+900℃×4 h,AC。采用该工艺处理后的DZ68合金具有优异的持久性能,在980℃和235 MPa的条件下持久寿命达163.78 h。
A new type of superalloy DZ68 heat treatment process was studied. The initial melting temperature range of DZ68 alloy was determined to be 1 240 ~ 1 260 ℃ by metallographic analysis. The microstructures of different states of the alloy were analyzed by optical microscope and scanning electron microscope, and the durability of the alloy was measured. The results show that the best heat treatment process of DZ68 alloy is: 1 240 ℃ × 0.5 h + 1 260 ℃ × 0.5 h + 1 280 ℃ × 2 h, AC + 1 120 ℃ × 4 h, FC × 1 h → 1 080 ℃ × 4 h, AC + 900 ℃ × 4 h, AC. The DZ68 alloy treated by the process has excellent long-term performance, and has a long-term life of 163.78 h at 980 ° C. and 235 MPa.