...织的分析,在连铸坯的最外层是细晶区,又称为激冷区(Chill Zone),由随机取向的等轴细晶组成;然后是柱状晶区(Columnar Zone),由平行于热量
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The outer zone is made up of reticular cells, columnar cells and mucous cells;
外区主要由网状上皮细胞、柱状上皮细胞、黏液细胞组成;
The results show that:under the no preheating condition, the microstructure of weld metal is columnar austenitic, and brittle martensite exists in the fusion zone and over-heated zone unavoidably.
研究结果表明:在不预热条件下,用KD286焊补钢轨,焊缝组织为柱状奥氏体组织,熔合区和过热区不可避免地产生脆硬的马氏体组织。
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