氧化铈对低合金钢焊条熔敷金属的影响  

Cerium Oxide Influence upon Low Alloy Steel Electrode Deposited Metal

作　　者：郭永环[1] 范希营[1] 高顶[2] 

机构地区：[1]徐州师范大学机电工程学院,徐州221116 [2]中国矿业大学机电工程学院,徐州221116

出　　处：《机械工程学报》2009年第4期285-289,共5页Journal of Mechanical Engineering

基　　金：徐州市科技计划资助项目(XJ08072)。

摘　　要：基于现有焊条性能的特点,针对典型低合金钢焊条(E5515型焊条)当焊接碳当量CE>0.4%的中、高碳钢时,焊接性较差的问题,在新型低合金钢焊条药皮配方开发研制中采取药皮过渡微量的稀土氧化物。通过冲击韧度、拉伸、硬度和金相等试验研究氧化铈对低合金钢焊条熔敷金属力学性能影响和组织的影响,利用扫描电子显微镜对显微组织进行观察分析,用X射线能谱仪进行能谱分析。分析研究结果表明,加入适量的稀土氧化物能够细化熔敷金属显微组织,提高熔敷金属的冲击韧度;稀土能降低熔敷金属中的氢,从而显著降低钢的脆性转变温度。当氧化铈加入量最佳时,熔敷金属的抗拉强度提高了43.27%,屈服强度提高了52.11%,冲击韧度提高了26.49%,而硬度却不下降。Based on the characteristics of existing electrode performance, in view of the poor weld ability of typical low alloy steel electrode （E5515） when it is used to weld CE〉0.4% medium high carbon-steel, micro-amount rare earth oxide is transferred through the electrode coating in the development of formula for the new type low alloy steel electrode. Through impact toughness, tension, hardness and metallographic tests, etc., the influence of the cerium oxide on mechanical properties and microstructure of the deposited metal of a low alloy steel electrode is studied, microstructure is observed by using scanning electron microscope, energy spectrum is analyzed by using X-ray energy dispersion spectroscopy. The results show that the addition of rare earth can effectively refine the microstructure and improve the impact toughness of deposited metal; the rare earth can decrease the hydrogen of deposited metal, so that it dramatically decreases brittle transition temperature of steel. When the amount of added cerium oxide ceria is optimal, the tensile strength of deposited metal is improved by 43.27%, the yield strength by 52.11%, the impact ductility by 26.49%, yet the hardness does not decrease.

关 键 词：氧化铈 低合金钢焊条 熔敷金属 组织 力学性能 

分 类 号：TG422.1[金属学及工艺—焊接] TG146.4[一般工业技术—材料科学与工程]