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铸件壁厚对 ZL205A 合金组织和性能的影响
Effect of Casting Wall Thickness on the Microstructure and Properties of the ZL205A Alloy
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- DOI:
- 作者:
- 杨 玲 1 ，高艳丽 1，2 ，郝慧林 1，2 ，刘崇证 1，2 ，潘俊杰 1，2 ，刘闪光 1，2
YANG Ling1 , GAO Yanli1,2, HAO Huilin1,2, LIU Chongzheng1,2, PAN Junjie1,2, LIU Shanguang1,2, WANG H
- 作者单位:
- 1. 中国航发北京航空材料研究院，北京 100095；2. 北京市先进铝合金材料及应用工程技术研究中心，北京 100095
1. Beijing Institute of Aeronautical Materials, Beijing 100095, China; 2. Beijing Engineering Research Center for Advanced Aluminum Alloys, Beijing 100095, China
- 关键词:
- ZL205A；壁厚；冷却速度；热处理
ZL205A alloy; wall thickness; cooling rate; heat treatment
- 摘要:
- 本文以 ZL205A 合金为研究对象，采用 OM、SEM、TEM 对铸件组织进行分析，研究了不同壁厚对铸件显微
组织和力学性能的影响。 结果表明，随着铸件壁厚增加，ZL205A 合金冷却速率不断降低，导致合金晶粒尺寸增加。 晶粒
尺寸的增加，导致铸态条件下，合金的抗拉强度和伸长率随冷却速度的降低而降低，同时由于退火效应存在，屈服强度
随冷却速率的降低略有增加。 不同冷却速率的铸件经固溶淬火处理后，晶界的共晶组织几乎完全固溶于晶内，当冷却速
率为 7.4 K/s 和 2.0 K/s 时，铸件的析出相密度和尺寸接近；当冷却速率为 0.5 K/s 时，铸件析出相密度降低，尺寸增加。合
金的抗拉强度、屈服强度和伸长率均随铸件冷却速率的降低而降低，其中冷却速率为 0.5 K/s 的铸件孔洞缺陷显著增加
但强度并未骤然降低。
The effects of different wall thicknesses on the microstructure and mechanical properties of casting ZL205A alloy were studied. The results show that the cooling rate of the ZL205A alloy decreases with increasing casting wall thickness, which leads to an increase in alloy grain size. The ultimate tensile strength and elongation of the as-cast alloy thus decrease with the reduced cooling rate due to the coarsened grain, while the yield strength slightly increases considering the annealing effect. The eutectic structure along the grain boundaries of castings with different cooling rates is almost completely dissolved after solution quenching treatment. When the cooling rates are 7.4 and 2.0 K/s, the density and size of the precipitates in the casting are close to each other. When the cooling rate is 0.5 K/s, the density of the precipitates decreases while the size increases. The ultimate tensile strength, yield strength and elongation of the alloy decrease with the reduced cooling rate. The hole defects of the casting with a cooling rate of 0.5 K/s increase significantly, but the strength does not decrease abruptly.