高铬铸铁型药芯焊丝工艺及其堆焊层耐磨性能研究
发布时间：2019-01-19 19:15
【摘要】：高铬铸铁型药芯焊丝以其优异的堆焊性能已广泛应用于各种耐磨粒磨损部件的制造与堆焊修复中。本文对实验室自制的金属粉型高铬铸铁药芯焊丝的堆焊工艺性能及堆焊层耐磨性能进行了分析研究。借助高速摄影机对药芯焊丝熔滴过渡过程的拍摄以及水槽法对焊接飞溅颗粒的收集,观察和研究了高铬铸铁药芯焊丝的熔滴过渡过程以及焊接飞溅的形式和特点;利用磨粒磨损试验机测试了高铬铸铁堆焊层的耐磨性;采用光学金相显微镜、扫描电镜、能谱测量仪对高铬铸铁堆焊层组织及磨损试样的表面磨损状况进行观察分析。研究结果表明:(1)研制的高铬铸铁型药芯焊丝在堆焊过程中有着良好的工艺性能,堆焊焊缝圆滑平整且渣量极少,熔滴过渡过程为稳定的大滴排斥过渡,飞溅率较低,在1%左右。(2)小颗粒飞溅(d1mm)是该药芯焊丝堆焊过程中出现频率最高的飞溅,易产生于熔滴脱离焊丝端部瞬间和熔滴炸裂瞬间;中等颗粒飞溅(1mm≤d≤2mm)往往产生于熔滴形成初期和熔滴剧烈爆炸的时刻,其在数量上远不及小颗粒飞溅;大颗粒飞溅(d2mm)偶尔出现,一般是整个熔滴飞出熔池区域。(3)高铬铸铁堆焊层在磨粒磨损过程中除了砂带参与磨损之外,其他磨粒主要还有M7C3型碳化物、铬的其他碳化物、NbC。焊丝中过量的Nb可能会不利于耐磨粒磨损性能的提高。
[Abstract]:High chromium cast iron flux-cored wire has been widely used in the manufacture and repair of wear resistant wear parts due to its excellent surfacing properties. In this paper, the surfacing technology and the wear resistance of the surfacing layer of the metal powder high chromium cast iron flux cored wire made by ourselves in laboratory are analyzed and studied. The droplet transfer process of high chromium cast iron flux-cored wire and the form and characteristics of welding spatter were observed and studied by means of high-speed camera shooting of flux-cored wire droplet transfer process and the collection of splashing particles by flume method. The wear resistance of high chromium cast iron surfacing layer was tested by abrasive wear tester, and the microstructure and surface wear of high chromium cast iron surfacing layer were observed and analyzed by optical microscope, scanning electron microscope and energy dispersive spectrometer. The results show that: (1) the developed flux-cored wire with high chromium cast iron has good technological properties during surfacing, the weld seam is smooth and the amount of slag is very small, the droplet transfer process is stable and large droplet repulsive transition, and the spatter rate is low. (2) small particle splashing (d1mm) is the most frequent spatter in the surfacing process of the flux-cored wire, which is easy to occur when the droplet is separated from the end of the wire and the droplet burst; The medium particle spatter (1mm 鈮，
本文编号：2411671
[Abstract]:High chromium cast iron flux-cored wire has been widely used in the manufacture and repair of wear resistant wear parts due to its excellent surfacing properties. In this paper, the surfacing technology and the wear resistance of the surfacing layer of the metal powder high chromium cast iron flux cored wire made by ourselves in laboratory are analyzed and studied. The droplet transfer process of high chromium cast iron flux-cored wire and the form and characteristics of welding spatter were observed and studied by means of high-speed camera shooting of flux-cored wire droplet transfer process and the collection of splashing particles by flume method. The wear resistance of high chromium cast iron surfacing layer was tested by abrasive wear tester, and the microstructure and surface wear of high chromium cast iron surfacing layer were observed and analyzed by optical microscope, scanning electron microscope and energy dispersive spectrometer. The results show that: (1) the developed flux-cored wire with high chromium cast iron has good technological properties during surfacing, the weld seam is smooth and the amount of slag is very small, the droplet transfer process is stable and large droplet repulsive transition, and the spatter rate is low. (2) small particle splashing (d1mm) is the most frequent spatter in the surfacing process of the flux-cored wire, which is easy to occur when the droplet is separated from the end of the wire and the droplet burst; The medium particle spatter (1mm 鈮，
本文编号：2411671
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