R26合金盐浴渗铬后的组织与性能  

Microstructure and properties of R26 alloy after salt bath chromizing

作　　者：赵旭红[1] 李志强[1] 徐佰明[1] 陈昭运 

机构地区：[1]哈尔滨汽轮机厂有限责任公司,黑龙江哈尔滨150046 [2]哈尔滨工程大学材料科学与化学工程学院,黑龙江哈尔滨150001

出　　处：《金属热处理》2012年第6期81-84,共4页Heat Treatment of Metals

摘　　要：利用光学显微镜(OM)、扫描电镜(SEM)、显微硬度计、摩擦磨损试验机、循环极化曲线和高温氧化试验对R26合金渗铬后的组织性能进行研究。结果表明,R26合金渗铬及热处理后,渗层主要由Ni-Cr-Fe、NiCoCr、Ni3Al、(Cr,Co,Ni)23C6、(Cr,Fe)7C3等相组成,渗层厚度约15μm,表面硬度显著提高,摩擦因数降低,磨损率明显减少,耐磨性提高。R26合金渗铬及热处理后,耐电化学腐蚀和抗高温氧化性能有一定提高,对于改善高温螺栓的抗咬死能力有一定的作用。Microstructure and properties of chromized layer of R26 alloy was observed by OM, SEM, micro-hardness, pin-on-disk wear tests, cyclic polarization curves and high-temperature oxidation tests. The results show that the chromized layer consists of Ni-Cr-Fe, NiCoCr, Ni3 Al, （Cr, Co, Ni）23 C6 and （Cr, Fe）7 C3 phases after salt-bath chromizing and subsequent heat treatment, and exhibits higher hardness, lower friction coefficient and wear rate, the depth of chromized layer is about 15 μm. The salt bath chromiziug process is expected to be an effective way to prevent bolts from scuffing at high temperature due to it significantly improved electrochemical corrosion resistance and high temperature oxidation resistance.

关 键 词：R26合金 盐浴渗铬 磨损 腐蚀 

分 类 号：TG156.8[金属学及工艺—热处理] TG178[金属学及工艺—金属学]