表面技术
錶麵技術
표면기술
SURFACE TECHNOLOGY
2015年
6期
59-64,87
,共7页
细晶化%塑性变形%元素互扩散%显微硬度
細晶化%塑性變形%元素互擴散%顯微硬度
세정화%소성변형%원소호확산%현미경도
fine crystallization%plastic deformation%element interdiffusion%microhardness
目的：对热喷涂涂层进行表面改性。方法利用搅拌摩擦加工技术多道次加工制备复合层,分析受影响区涂层和基体的显微组织、元素扩散、显微硬度变化规律。结果形成了均匀致密且细晶化、涂层与界面消失、靠近涂层部分基体发生动态再结晶的复合层。从涂层到基体形成了有层次的260μm厚度渐变影响区,依次为：BZ,RLS,FRZ,ECZ。温度场和塑性变形的耦合作用为涂层和基体元素互扩散提供了有利通道,发生了快速元素互扩散。细晶强化和元素扩散共同作用使显微硬度显著提高,机械性能得到改善。结论搅拌摩擦加工技术能有效改善热喷涂涂层的组织和性能。
目的：對熱噴塗塗層進行錶麵改性。方法利用攪拌摩抆加工技術多道次加工製備複閤層,分析受影響區塗層和基體的顯微組織、元素擴散、顯微硬度變化規律。結果形成瞭均勻緻密且細晶化、塗層與界麵消失、靠近塗層部分基體髮生動態再結晶的複閤層。從塗層到基體形成瞭有層次的260μm厚度漸變影響區,依次為：BZ,RLS,FRZ,ECZ。溫度場和塑性變形的耦閤作用為塗層和基體元素互擴散提供瞭有利通道,髮生瞭快速元素互擴散。細晶彊化和元素擴散共同作用使顯微硬度顯著提高,機械性能得到改善。結論攪拌摩抆加工技術能有效改善熱噴塗塗層的組織和性能。
목적：대열분도도층진행표면개성。방법이용교반마찰가공기술다도차가공제비복합층,분석수영향구도층화기체적현미조직、원소확산、현미경도변화규률。결과형성료균균치밀차세정화、도층여계면소실、고근도층부분기체발생동태재결정적복합층。종도층도기체형성료유층차적260μm후도점변영향구,의차위：BZ,RLS,FRZ,ECZ。온도장화소성변형적우합작용위도층화기체원소호확산제공료유리통도,발생료쾌속원소호확산。세정강화화원소확산공동작용사현미경도현저제고,궤계성능득도개선。결론교반마찰가공기술능유효개선열분도도층적조직화성능。
Objective To improve the thermal spraying coating layer. Methods Composite layer was prepared by using multi-pass friction stir processing technology. The transformation regulation of microscopic structure, element diffusion and microhardness were analyzed both on the affected area coating layer and substrate. Results A composite layer of uniform density and fine crystalli-zation, interface of coating layer and substrate disappeared, dynamic recrystallization occurred was formed. A 260 μm hierarchical gradient affected zone was formed from the coating layer to the substrate:BZ, RLS, FRZ, ECZ. The coupling effect of temperature and plastic deformation provided favorable channel to fast element interdiffusion. Combination of fine-grain and elements diffusion obviously improved the microhardness and mechanical performance. Conclusion Friction stir processing technology can effectively improve the microscopic structure and properties of thermal spray coating layer.
