Effect of Y-base rare earth on the microstructure and impact toughness of E36 steel plate
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摘要: 運用掃描電鏡及能譜等分析手段研究了釔基稀土對E36鋼中夾雜物的變質作用以及對顯微組織和沖擊性能的影響.研究表明，釔基稀土改善了E36鋼的顯微組織，減少了珠光體的片間距和含量.加入釔基稀土后，E36鋼的沖擊斷口由典型的解理斷口變為準解理+韌窩型斷口，韌窩中細小球狀的稀土夾雜是其轉變的主要原因.加入少量的釔基稀土顯著改善了E36鋼的沖擊韌性，尤其是低溫沖擊性能.在-60℃情況下，E36Re鋼的縱向沖擊功較E36鋼提高了33.5%，橫向沖擊功提高了113.7%.并且，釔基稀土顯著改善了E36鋼縱橫向沖擊性能的差異性，未加稀土E36鋼的縱、橫沖擊比均大于1.70，-60℃條件下達到2.77，而E36Re鋼的縱、橫沖擊比為1.51~1.73.Abstract: The effect of Y-base rare earth on the inclusions modification, microstructure and impact toughness of E36 steel was investigated by using scanning electron microscopy and energy spectrum analysis. The results indicate that Y-base rare earth improves the microstructure and reduces the interlamellar spacing and content of pearlite. The typical cleavage fracture of E36 steel is quasi-cleavage and dimple fracture when adding Y-base rare earth. Fine and spherical rare earth inclusions are the main reason for the fracture transformation. The impact toughness of E36 steel is improved obviously by Y-base rare earth, especially at the low temperature. In comparison with E36 steel without Y-base rare earth, the longitudinal impact energy of E36 steel containing Y-base rare earth is increased by 33.5%, and the transverse impact energy is increased by 113.7% at -60℃. Moreover, the difference of longitudinal and transverse impact toughness is decreased by Y-base rare earth significantly. To E36 steel without Y-base rare earth, the proportion of longitudinal and transverse impact values is greater than 1.70 and it reaches 2.77 at -60℃. And the proportion of longitudinal and transverse impact values is 1.51-1.73 for E36 steel plate containing Y-base rare earth.
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Key words:
- rare earths /
- steel plate /
- microstructure /
- impact toughness
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參考文獻
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