颗粒度对E4303电焊条性能影响

Granularity effect to E4303 electrodes' performance

以E4303电焊条药皮配方中中碳锰铁合金为研究对象,取三种不同颗粒度的中碳锰铁制备E4303电焊条。对制备的电焊条分别进行了主要焊接工艺性能测试、熔敷金属的微观组织观察、熔敷金属化学成分分析和熔敷金属冲击性能试验。结果表明,加入纳米级中碳锰铁的电焊条电弧稳定性优良;纳米颗粒增加了晶粒形核的核心,起到了细化晶粒的作用;纳米颗粒烧损严重,减弱了中碳锰铁合金的脱氧、脱硫和渗合金效果,使熔敷金属内产生弥散氧化夹渣,导致冲击韧性降低。

Three different electrodes with different granularities medium carbon ferromanganese had been studied.The researches include welding technology performance of electrodes,the microstructure of deposited metal,chemical composition and impact toughness of deposited metal.The results showed that by adding nano medium carbon ferromanganese,the arc stability is better,the nano granule can increase nucleation core of crystal which play a role in grain refining,meanwhile the nano grain is burned badly,the deoxidation and desulfidation are weaken,impact toughness of deposited metal is reduced due to the overabundance oxide slag.