摘要
研制了一种新型钢用WC颗粒增强铜基合金覆层用的CuMnNiCr多元铜基钎料,对该钎料的熔化特性、钎料组织、钎焊工艺及力学性能进行了研究,并通过优化的钎焊表面合金化工艺,在普通铸钢件表层制得了WC颗粒增强铜基合金耐磨覆层．研究结果表明,与普通的CuZnNi、CuMnNi合金钎料及NiCrBSi高温自熔合金钎料比较,CuMnNiCr多元合金钎料由于多种强化机制而具有优良的综合力学性能．此外,该钎料还具有优异的钎焊冶金特性、致密的冶金结合界面以及较高的界面结合强度．使用该钎料制备的复合覆层具有良好的综合性能．SEM,EDS及XRD分析表明:该复合覆层与钢母体结合牢固;覆层内合金基体与WC颗粒形成了冶金结合,WC的体积分数可达54%,复合覆层组织由α-Cu固溶体基体、α-Cr与MnNi弥散硬化相及WC硬质相组成．磨损实验证明,该覆层的耐磨性远优于30MnSiTi马氏体低合金钢．
A new type of brazing alloy, CuMnNiCr multicomponent Cu-based alloy, used in composite cladding reinforced with WC particles on steel substrate was developed. The melting characteristics, microstructure, brazing technological and mechanical properties of CuMnNiCr filler metal were investigated systematically. Using the brazing alloy, a stable wear-resistant composite cladding can be formed on the surface of common steel by optimum brazed hardfacing process. Compared with common brazing alloys, such as CuZnNi, CuMnNi and NiCrBSi, the CuMnNiCr brazing alloy has excellent mechanical property, good brazing characteristics and compact metallurgical binding interface because of its multiple strengthening mechanisms. In addition, the composite cladding has good combination property. SEM, EDS and XRD analyses showed that a metallurgical binding formed between the cladding and steel parent metal, and between brazing alloy matrix and WC grains. The composite cladding is composed of α-Cu solid solution, α-Cr and MnNi dispersion phases as well as WC hard phase with the volume fraction of 54%. Impingement erosion wear tests proved that the wear resistance of the composite cladding is far superior to that of 30MnSiTi martensitic steel.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第4期433-438,共6页
Acta Metallurgica Sinica
基金
大连市科学技术基金优秀青年科技人才基金[2003]99
