针对GH4169合金的Delta工艺,经热变形后在950～1040℃范围内进行热处理实验,研究了δ相对晶粒长大的影响规律.结果表明:δ相通过对晶界的钉扎作用可以有效地抑制品粒长大,同时δ相发生了溶解;当温度为950℃时,其显微组织演变机制主要为静态回复;当温度高于980℃时,δ相大量溶解,其显微组织演变机制主要为晶粒长大和退火孪晶形成.因此,GH4169合金Delta工艺中需严格控制加热和变形温度在950～980℃之间.
In view of the Delta process of GH4169 alloy,the heat treatment experiments were carried out in the range of 950-1040 ℃ after hot deformation,and effects of δ phase on grain growth of the alloy were studied.The results indicate that the grain growth of the alloy is restrained due to the pinning effect of δ phase,and the dissolution of δ phase occurs.As the temperature is 950 ℃,the mechanism of microstructure evolution is mainly static recovery.However,as the temperature increases to 980 ℃,the δ phase dissolves largely,and the mechanism of microstructure evolution is mainly grain growth and the formation of annealing twins.Therefore,it is necessary to strictly control the heating and deformation temperature between 950 and 980 ℃ for the Delta process of the GH4169 alloy.
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