Influence of vanadium precipitation on hot ductility and microstructure of medium-carbon manganese non-quenched and tempered steel

doi:10.13251/j.issn.0254-6051.2020.10.031

Abstract

Abstract: High temperature mechanical properties and microstructure of two medium-carbon and manganese non-quenched and tempered steels without and with vanadium addition were comparatively analyzed by thermal simulation test, and then the influence of V precipitation on the hot ductility and microstructure was studied. The results show that high temperature deformation induced V(C, N) precipitates can inhibit the dynamic recrystallization behavior and increase deformation resistance, and promote intragranular ferrite transformation; and therefore causing that the hot ductility is decreased, the temperature range of high ductility is narrowed, and the temperature range of low ductility is widened. On the other hand, VC phase precipitates mainly along the γ/α interface during the transformation from austenite to ferrite, and is beneficial to the ferrite growing toward the austenite grain insides. After solution treating at 1280 ℃ and then deforming at temperature range of 900-1100 ℃and 1000-1130 ℃ respectively, both the tested steels without and with vanadium addition can obtain high hot ductility.

Key words: non-quenched and tempered steel, hot ductility, microstructure, vanadium precipitation

CLC Number:

TG142.1

Fang Jian, Hu Zhangyong, Yuan Zexi. Influence of vanadium precipitation on hot ductility and microstructure of medium-carbon manganese non-quenched and tempered steel[J]. Heat Treatment of Metals, 2020, 45(10): 158-163.

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