稀土、镍、锰对铝硅合金熔敷金属中铁相形态的影响

Influence of RE, Ni, Mn on Fe-phase Aspect in Al-Si Alloy

用氩弧将铁、镍、稀土、锰直接或间接熔入铝硅合金表面 ,研究这些元素对含铁量为1 0 3%～ 6 .92 %的焊缝中铁相形态的影响。研究发现 ,稀土含量低时可抑制针状铁相 ;稀土含量大于一定量就会生成针状的Al Si Re Ni Fe相 ,该针状相的长度随稀土含量的增加而增加。铝硅合金中加入铁、锰、稀土后 ,熔敷金属中出现四瓣状Al Si Mn Fe相。若加入等量的Fe、Ni,熔敷金属中会形成间断的Al Si Fe Ni网状组织 ;若同时加入锰 ,除了生成网状结构外 ,还会同时存在四瓣状Al Si Mn Fe相和三瓣状的Al Si Mn Fe Ni相。在铝硅合金中 ,单独加镍、同时加稀土和镍、同时加稀土和锰、同时加锰和镍均可很好地抑制针状铁相。锰、镍抑制针状铁相的效果明显优于稀土。

Fe, Ni, Mn and RE are melted into the surface of Al Si alloy by argon arc directly or indirectly. The influence of these elements on Fe phase aspect in welds containing 1.03%～6.92%Fe is studied. It is found that if Fe, Ni and RE are added into Al Si alloy, the acicular Fe phase can be bated when RE content is low. Acicular Al Si La Ce Fe Ni phase will occur when RE content exceed certain value, the length of the acicular phase grows with the increase of RE content. When Fe, Mn, RE are added into Al Si alloy, a kind of quatrefoil shaped Al Si Mn Fe phase appears in weld. If Fe and Ni of same contents are added into Al Si alloy with 11%～13%Si content, a discontinuous Al Si Fe Ni netlike structure forms. If Mn is added into this Al Si alloy at the same time, then besides the netlike structures form in deposited metal, there are also three petals Al Si Mn Fe Ni and quatrefoil shaped Al Si Mn Fe phases. In the deposited metal of Al Si alloy, no matter Ni is added alone, or Mn and RE, or Ni and RE, or Mn and Ni are added simultaneously, the acicular Fe phase can be all restricted effectively. The results that Mn, Ni control acicular Fe phase are markedly better than those that RE does.