喷雾沉积高硅ZA27合金的组织与性能

MICROSTRUCTURE AND PROPERTIES OF HIGH Si ALLOY ZA27 PRODUCED BY SPRAY DEPOSITION

报道喷雾沉积高硅ＺＡ２７合金的组织和高温性能．采用环缝式雾化器，氮气雾化，钢基底水平单向运动．合金成分为标准ＺＡ２７中添加４％Ｓｉ和０．３％Ｆｅ，喷雾沉积组织由孔洞（２—４％）富硅相（３０—４０％）和基体构成．富硅相呈球状弥散均匀分布．时效之前，喷雾沉积与常规铸造高硅ＺＡ２７合金的显微硬度和高温（１５０℃）硬度没有明显差别，长期时效之后，喷雾沉积合金的上述性能明显高于常规铸造合金．喷雾沉积与合金化相结合是改善ＺＡ２７合金高温性能的有效途径．

The microstructure and high-temperature properties of ZA27 alloy containing 4% Si and 0.3 % Fe produced by spray deposition are investigated. The microstructure of the alloy was made up of porosity(2% 4%), spheroial and uniform silicon-riched phases(30% 40%) and three kinds of substrate. The micro-hardness(HV) and high-temperature hardness(HB) of the alloy produced by spray deposition or conventional casting process make no difference before aging, but all the above properties is greatly improved by spray deposition after aging.