熔铸工艺对DZ417G合金组织性能的影响  

Effect of smelt-casting technology on the microstructure and mechanical properties of DZ417G superalloy

作　　者：彭志江[1] 张明俊[1] 乐献刚[1] 

机构地区：[1]中航工业沈阳黎明航空发动机(集团)有限责任公司,沈阳110043

出　　处：《材料科学与工艺》2013年第4期50-56,共7页Materials Science and Technology

摘　　要：为了分析熔铸工艺对DZ417G合金组织性能的影响，通过对DZ417G合金采取常规浇注（1560℃高温精炼5～7S普通定向凝固）、炉前经不同温度高温熔体过热处理后，以不同的拉晶速率定向凝固等7种不同工艺方案对其化学成分、组织及力学性能进行了研究．结果表明：合金经1600—1620℃高温熔体过热处理后，以6．0-7．0mm／min不同的拉晶速率定向凝固，碳化物、硼化物明显变小，在晶内、晶界上呈弥散状态分布；晶界上的低熔点（γ’＋γ’）共晶组织有所减少甚至消失，晶内γ’强化相进一步弥散、方形化，柱状晶生长状态、枝晶间咬合好，从而能获得良好的力学性能．To analyze the effect of casting process on the micnostructure and mechanical properties of DZ417G alloy, The chemical compositions, microstructure and mechanical properties of DZ417G super alloy produced via 7 different technologies was studied. The different technologies cover different melt treatment temperature and withdrawal rate. The results indicated that, by heating the melt in the temperature range from 1 600 1 620 ℃ with the directional solidification withdrawal rate（6.0 -7.0 mm/rain）the carbides and borides be- come fine significantly,and disperse in grains and on grain boundaries. The γ ＋ γ＇ eutectic structure decreases or disappear even, and the γ＇ particles in grain become more dispersed, and the shape tends to be more regu- lar. The columnar grains are of good growth and interactive gear. Thus, favorable mechanical properties can be gained.

关 键 词：熔铸工艺 过热处理 DZ417G合金 组织 性能 

分 类 号：TG132[一般工业技术—材料科学与工程]