【摘要】 镍铁型铸铁焊条对热裂纹比较敏感。本文应用临界变形速度法,使用HRL-1型热裂纹试验机,研究了稀土钇以及碳、钴、硅、铜、锰、硫、磷对热裂纹的影响,以改善镍铁焊条抗热裂性能。试验表明,稀土钇以及碳、钴和硅在焊缝金属中的含量有一最佳值,超过该值或者低于该值都会使抗热裂性能下降;锰、铜、硫和磷都增加焊缝金属的热裂纹敏感性。本文讨论了这些结论的原因,综合运用稀土钇和钴、碳显著改善了镍铁型铸铁焊条的抗热裂性能。更多还原

【Abstract】 The welding of cast iron with nickel-iron electrodes is in general susceptible tohot-cracking.In this paper,the hot-cracking test machine (type HRL-1) based on thetheory of critical deformation speed was used.The effects of rare earth,C,Si,Mn,Co,Cu,S and P elements on hot-cracking were investigated.The optimum RE,C,Co and Si con-tents of the weld metal were determined.Content higher or lower than the respective op-timum value would result in the reduction of hot-cracking resistance.Mn,Cu,S and Pincrease the hot-cracking susceptibility of the weld metal.The reasons of thesephenomena were discussed.The comprehensive utilization of the RE,C and Co elementscan remarkably improve the hot-cracking susceptibility.更多还原