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为充分挖掘沉淀强化型镍基高温合金GH4202管材性能,以满足我国航天新型发动机的要求,研究了固溶处理温度对合金组织及拉伸性能的影响规律.结果表明,在1 050~1 075℃范围固溶处理后合金晶粒度无明显变化,当固溶温度升至1 100℃时,合金局部出现异常晶粒长大,当固溶温度达到1 150℃时,合金晶粒均匀长大.随固溶温度升高,合金晶界硼、碳化物数量明显减少,由链状向孤立的颗粒状转变.随固溶温度升高,GH4202合金室温及高温拉伸强度均呈降低趋势,尤其以屈服强度降低幅度最为显著.合金的室温面缩率随固溶温度升高而降低,且降低幅度较大,但室温断裂延伸率变化并不显著;700℃下合金的断面收缩率与断裂延伸率随固溶温度的变化均表现为先升高后降低的趋势.GH4202合金最佳固溶处理工艺为1 110℃保温30 min后水冷,此时合金晶粒度为5.0级、晶界碳化物呈细小链状,晶内沉淀强化γ’相弥散析出,可保证合金具有优异的室温及高温力学性能.
In order to fully excavate the performance of GH4202 pipe with precipitation-strengthened nickel base superalloy and meet the requirements of China’s new aerospace engine, the influence of solution treatment temperature on the microstructure and tensile properties of the alloy was studied. The results show that at 1 050 ~ 1 075 ℃ When the solid solution temperature rises to 1 100 ℃, the alloy grains grow abnormally locally. When the solution temperature reaches 1 150 ℃, the alloy grains grow uniformly. With the increase of solution temperature, the amount of boron and carbides in the grain boundary of the alloy decreases obviously, and changes from chains to isolated grains. With the increase of solution temperature, tensile strength at room temperature and high temperature of GH4202 alloy decrease, especially The yield strength decreases most significantly.The room-temperature shrinkage decreases with the increase of solution temperature, and the decrease is larger, but the change of elongation at room temperature is insignificant. The cross-section shrinkage and elongation at break The results show that the optimum solution treatment for GH4202 alloy is 1 110 ℃ for 30 min and then water cooled, the grain size of the alloy is 5.0 and the grain boundary carbide Small chain, crystal Precipitation strengthening γ ’precipitates dispersed phase, the alloy can ensure excellent room and elevated temperature mechanical properties.