热处理对Inconel718合金组织及力学性能的影响

针对Inconel 718合金的不同用途,分析研究了4种常用热处理工艺对Inconel 718合金组织和力学性能的影响。结果表明:固溶温度超过1020℃时,奥氏体晶粒显著长大。合金中主要析出相有MC、δ、γ'和γ″相。δ相沿晶界分布,1025℃固溶时呈颗粒状少量析出;950℃固溶时呈块状大量析出;直接时效时呈网状不连续分布。同时,δ相对合金的晶粒度影响较大,且其析出数量和形态决定了合金的韧塑性,γ″、γ'相的析出量和尺寸与晶粒尺寸决定了合金的强度变化。

Heat Treatment Effect on Microstructure and Mechanical Properties of Re-Containing Inconel 718 Alloy

The effect of Rhenium additions to the standard Inconel 718 (ST IN718) alloy as well as solution and aging treatments on microstructure and hardness property were studied. The microstructure of Re-containing alloys has higher volume fraction of δ phase than standard alloy. Conventional solution treatment (CST) at 1273 K for 1h precipitates a thin film of δ phase at the grain boundaries as well as needle-like in γ matrix;however, after modified solution at 1440 K for 3 h long, both types of δ phase precipitates entirely vanish from the microstructure. Small colonies of needle-like δ phase start to appear with aging at 1023 K for 4 h, after CST. Prolonging the aging time to 50 h, these colonies enlarge in size and spread in the matrix. XRD and TEM observations were used to identify the precipitation of hard γ” and γ’ phases. The changing in hardness measurements were evidence about the precipitation of these hard phases. CST have higher rate to increase in hardness with aging time comparing to modified solution specimens.

标准热处理对718硼化镍铬合金显微组织和性能的影响（英文）

将718铬镍铁合金进行渗硼处理。为了得到强度和塑性的最佳组合,对硼化718铬镍铁合金进行标准热处理,包括固溶处理和双级时效处理。硼化层由化合物层和硼扩散区组成。由于硼化层有较高的硬度,与没有渗硼的718铬镍铁合金相比,硼化718铬镍铁合金的磨损率显著减少,摩擦因数也较低。标准热处理可以有效促进硼扩散到材料的内部,并促进新硼化物(Fe2B,CrB)的生成。经过标准热处理的硼化718铬镍铁合金由于其较厚的渗硼层(313.76μm)而表现出较好的耐磨性。