水玻璃波美度对复合粉粒和实心焊丝堆焊合金组织及性能的影响  

Effects of Baume Degree of Sodium Silicate on Microstructure and Properties of Hardfacing Alloys with Composite Powder Particles and Solid Wire

作　　者：龚建勋[1] 刘书同 张明华[1] 艾孝文 GONG Jianxun;LIU Shutong;ZHANG Minghua;AI Xiaowen(School of Mechanical Engineering and Mechanics,Xiangtan University,Xiangtan 411105,China)

机构地区：[1]湘潭大学机械工程和力学学院,湖南湘潭411105

出　　处：《热加工工艺》2024年第19期138-142,共5页Hot Working Technology

基　　金：湖南省自然科学基金资助项目(2021JJ30669)。

摘　　要：采用“复合粉粒+H08A实心焊丝”自保护明弧焊方法制备了高铬耐磨合金,借助X射线衍射仪、扫描电镜、电子能谱仪和磨损试验机,研究了硅酸钠型水玻璃的波美度对其组织及性能的影响。结果表明,混合粉末经水玻璃粘结造粒后,电弧燃烧稳定且飞溅减少;随着水玻璃波美度的提高,合金组元的过渡系数明显提升,组织从典型的亚共晶转变为过共晶结构,其中初生M_(7)C_(3)的体积分数显著提升。当水玻璃波美度为25时,堆焊合金耐磨性最好,是波美度为0时的7.6倍。随着水玻璃波美度的提高,合金耐磨性显著改善,磨损机制由微切削和微剥落的共存方式转变为以微剥落为主。High chromium wear resistant alloys were prepared by self-shielded open arc welding with composite powder particles(CPPs)and H08A solid wire.The effects of baume degree of sodium silicate on the microstructure and the properties were investigated by X-ray diffractometer(XRD),scanning electron microscopy(SEM),energy dispersive spectrometer(EDS)and wear tester.The results show that,the arc gets stabilized and the spatter decreases with the introduction of sodium silicate into powder mixture for granulating.With the increase of baume degree of sodium silicate,the transition coefficients of alloying elements increase and the microstructure is transited from hypoeutectic structure to hypereutectic structure,in which the volume fraction of primary M_(7)C_(3)phases increases dramatically.The optimal abrasion resistance is obtained at 25 baume degree,which is 7.6 times of the one at zero degree.The abrasion resistance has improved obviously with the increase of the baume degree and the wear mechanism has changed from a coexisting style of micro-cutting and micro-spalling to a dominant one of micro-spalling.

关 键 词：复合粉粒 堆焊 显微组织 耐磨性 波美度 

分 类 号：TG422.1[金属学及工艺—焊接]