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通过对微合金钢焊缝金属中夹杂物的研究发现 :夹杂物数量在焊缝中心最多 ,而在熔合线附近最少 ;随着焊接热输入的增加 ,夹杂物平均尺寸增大。约有 6 0 %夹杂物的平均尺寸都小于 0 .6 μm,而大于 1.0 μm的不足 10 %。夹杂物是由多个物相组成的复合物 ,组成夹杂物的物质 :Mn O2 、3Mn O· Al2 O3· Si O2 、Ti N、Ca O· 2 Al2 O3、Si O2 、Ca O· 2 Ti O2 和 θ- Al2 O3等。提供针状铁素体 (AF)形核的夹杂物尺寸约 93 %以上都集中在 0 .2～ 0 .6 μm范围内
Through the study of inclusions in the weld metal of microalloyed steels, it is found that the number of inclusions is the most in the weld center and the least in the vicinity of the weld line. The average inclusion size increases with the increase of welding heat input. About 60% of inclusions have an average size of less than 0.6 μm, whereas less than 10% of more than 1.0 μm. Inclusions are composed of multiple phases, inclusions: Mn O2, 3Mn O · Al2 O3 · Si O2, Ti N, CaO · 2 Al2 O3, Si O2, CaO · 2 Ti O2 And θ-Al 2 O 3 and the like. About 93% or more of inclusions providing acicular ferrite (AF) nucleation are concentrated in the range of 0.2-2.6 μm