摘要
首先采用粉末包埋法对工业纯铜进行渗铝,为进一步提高渗铝层强化效果,采用固溶处理、时效、深冷处理等多种工艺对工业纯铜渗铝层进行热处理。对热处理后的渗层的组织结构、硬度、耐磨性、耐蚀性及抗氧化性进行了研究。研究结果表明,渗铝层为α+(α+γ_2)组织。固溶水冷后,获得类似马氏体的针状组织β',深冷处理后,获得具有一定脱溶析出的细小β'组织,β'在300℃时效处理时发生脱溶,析出大量弥散析出相。经各种热处理后,硬度、耐磨性、耐蚀性及抗氧化性均有所提高。其中,固溶加热后直接液氮冷却+时效处理后,硬度达145.9 HRF;时效处理后大量弥第二相析出,有利提高耐磨性;渗层耐蚀性较纯铜提高一个数量级;热处理后组织更为细小致密,有效抑制表面氧化,表现出更好的抗氧化性。本研究采用的复合热处理工艺使纯铜渗铝层使用性能大幅提高,具有十分重要的实际应用价值。
Aluminized layer was prepared on the industrial pure copper surface by powder embedding method,in order to further improve the strengthening effect,the layer was treated by solution treatment,aging and cryogenic heat treatments. The microstructure,hardness,wear resistance,corrosion resistance and oxidation resistance of the aluminized layer after heat treatment were studied. The results show that,the metallographic microstructure of aluminized layer is α +( α + γ_2) phase. After solution treatment,the β' phase can be observed with acicular structure which is similar with martensite. After cryogenic treatment,the β' phase become more tiny,and the exsolution ofβ' occurred during aging treatment( at 300 ℃),a large number of dispersed second phase can be seen. After heat treatment,the hardness,wear resistance,corrosion resistance and oxidation resistance of the aluminized copper have been improved significantly. After the process of solution treatment + liquid nitrogen cooling directly + aging treatment,the hardness reaches up to 145. 9 HRF. The second phase will diffuse during the aging treatment,which is beneficial to improve the wear resistance,and the corrosion resistance of the aluminized layer has improved one order of magnitude than pure copper. The aluminized copper with small and compact microstructure has better oxidation resistance after heat treatment,which will restrain the surface oxidation effectively. The complex heat treatment process for aluminized layer on pure copper adopted in this research,which is helpful to improve its using performance obviously,and this technic has very important practical application value.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2015年第S2期198-202,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51401183)
浙江省公益技术应用项目(2014C31113)
浙江省博士后科研择优资助项目(BSH1302058)
关键词
工业纯铜
渗铝层
热处理
industrial pure copper
aluminized layer
heat treatment
