摘要:
通过三种不同热处理工艺对GH4169合金进行处理。通过金相观察、扫描电镜、显微硬度和冲击试验,观察和研究了三种不同热处理工艺下GH4169合金的微观组织演变和力学性能。结果表明:三种不同的热处理工艺改变了GH4169合金中δ相的析出以及分布。经过HST处理后,δ相呈短棒状或粒状在晶界上析出;通过ST处理后在晶界和晶内可获得较多的δ相;而通过DA处理的微观组织晶界处较平滑,几乎没有δ相析出。经过HST和ST处理后,GH4169合金的硬度值变化不大,冲击强度明显提高,断裂方式表现为穿晶断裂。通过DA处理后,其硬度降为热轧态的60%,但是冲击强度提高了4.5倍,断裂方式表现为沿晶断裂。
Abstract:
In this paper,GH4169 alloy was treated by three different heat treatment processes.The microstructure and mechanical properties of GH4169 superalloy under three different heat treatment processes were observed and studied by OM,SEM,the micro-hardness and impact test.The results show that different heat treatment process lead to different precipitation and distribution of δ phase in GH4169 superalloy.δ phase is short rod like or granular precipitates at grain boundaries after HST treatment,while δ phase can be obtained in the grain boundary and crystal after ST treatment.For DA treatment the grain boundary is smooth and no δ phase precipitation can be observed.After HST and ST treatment,the hardness of GH4169 superalloy did not change,the impact strength obviously increased and the fracture mode was transgranular fracture.After DA treatment,the hardness of GH4169 superalloy decreases down to 60% of as-hot rolled,but the impact strength increased by 4.5 times and the fracture mode showes interguanular fracture.
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