镍铬基K648合金α—Cr相析出的组织敏感性  被引量:2

Microstructure sensitivity of α—Cr phase in Ni-Cr based alloy K648

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作  者:史世凤[1] 范强[1] 贾崇林[1] 牛永吉[1] 

机构地区:[1]北京北冶功能材料有限公司,北京100192

出  处:《北京科技大学学报》2012年第8期908-914,共7页Journal of University of Science and Technology Beijing

摘  要:研究了合金成分和热处理制度对K648合金组织中α—Cr相析出形态和力学性能的影响,并通过Thermo-calc软件计算了K648合金平衡相析出规律.计算结果表明合金中的析出相主要为α—Cr、γ'相和M23C6碳化物.通过实际组织观察得出合金中α—Cr相的析出形态对Cr含量和热处理工艺制度极为敏感,具体表现为α—Cr相形态的多样性.力学性能测试进一步表明合金的室温拉伸性能、冲击性能均受α—Cr相形态和分布的影响,即合金性能表现出组织敏感性.The effects of element contents and heat treatment regimes on the precipitation morphology of α-Cr phase and the mechanical properties of K648 superalloy were systematically investigated by room-temperature tension and impact tests. The precipitation law of equilibrium phases in K648 superalloy was calculated by Thermo-Calc software. The calculated results show that the main equilibrium precipitation phases are α-Cr phase, γ^1 phase and M23 Cs carbide. Microstructure observations indicate that the precipitation morphology of α-Cr phase is sensitive to the Cr content and heat treatment regime, demonstrating its morphological variety. Mechanical property tests further testify that the room-temperature tensile properties and impact properties are significantly dependent on the morphology and distribution of α-Cr phase, meaning that the mechanical properties of the alloy have microstructure sensitivity.

关 键 词:镍铬合金 微观组织 析出 敏感性分析 力学性能 

分 类 号:TG146.15[一般工业技术—材料科学与工程]

 

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