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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. 研究結果表明：在不預熱條件下，用KD286銲補鋼軌，銲縫組織爲柱狀奧氏躰組織，熔郃區和過熱區不可避免地産生脆硬的馬氏躰組織。