In-situ research of high-temperature behavior of primary carbide in H13 steel
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摘要: 使用原位觀察方法研究了不同凝固條件H13鋼鑄錠樣品中液析碳化物的高溫行為.實驗發現連鑄錠及電渣錠兩種樣品在所研究的枝晶間存在明顯的合金元素偏析,其中Cr、Mo、V、C的偏析較為明顯,液析碳化物存在于凝固枝晶間偏析最嚴重的區域,成分為V、Mo、Cr、Ti的液析碳化物.連鑄錠及電渣錠兩種樣品分別在1200℃及1250℃圍繞液析碳化物周圍出現局部液相,理論計算的局部液相出現溫度與實驗觀察到的接近;隨著溫度的升高,局部液相范圍擴大,與電渣錠相比,加熱至相同溫度時,連鑄錠液析碳化物周圍的局部液相范圍更大.液析碳化物周圍局部液相的出現加快了枝晶間合金元素的擴散,對液析碳化物的高溫行為具有重要影響.Abstract: In-situ research was conducted to illuminate the high-temperature behavior of primary carbide in H13 steel that had been cast in different ways. Experimental observations indicate the obvious segregation of Cr, Mo, V, and C in the interdendrite zone of continuously cast and electroslag remelting (ESR) samples. In the interdendrite zone, primary carbide is composed of Cr, Mo, V, and Ti. A liquid phase was observed to occur around the primary carbide of two as-cast samples cast by continuous casting and ESR processes when heated to 1200℃ and 1250℃, respectively. The temperature at which the liquid phase appears agrees well with theoretical calculations. The liquid-phase region expands as the heating temperature increases and the continuous casting sample shows a larger liquid zone. The emergence of a partial liquid phase accelerates the diffusion of the segregated elements and is an important factor in the high-temperature behavior of primary carbide.
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Key words:
- primary carbide /
- microsegregation /
- in-situ observation /
- partial liquid phase
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參考文獻
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