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Effect of intercritical temperature on the strain hardening of dual-phase bainite/ferrite steel
Materials Science and Technology ( IF 1.8 ) Pub Date : 2020-08-27 , DOI: 10.1080/02670836.2020.1809854
Bilal Nawaz 1 , Zhinan Yang 2, 3 , Fucheng Zhang 1, 2 , Junkui Li 1
Affiliation  

Medium-carbon dual-phase bainite/ferrite steels with different bainite and carbide volume fractions were prepared via intercritical annealing and austempering. Bainite dominated the microstructure at high intercritical temperatures, and carbides and ferrite phase dominated at low temperatures. Carbides existed in two types, undissolved alloy–cementite and vanadium carbide. The ferrite grain size was reduced to 1.22 ± 0.7 µm at 790°C. Modified Crussard–Jaoul (MC–J) model was used to analyse the strain hardening process, and the highest strain hardening rate was obtained at 755°C. The high carbide fraction at 755°C increased the ferrite dislocation density and enhanced the ferrite phase strength. The high dislocation density in ferrite and the small strength difference in bainite and ferrite enhanced the strain hardening rate at 755°C.

中文翻译:

临界温度对贝氏体/铁素体双相钢应变硬化的影响

通过临界区退火和奥氏体回火制备了具有不同贝氏体和碳化物体积分数的中碳双相贝氏体/铁素体钢。在高临界温度下贝氏体占主导地位,在低温下碳化物和铁素体相占主导地位。碳化物存在两种类型,未溶解的合金-渗碳体和碳化钒。在 790°C 时,铁素体晶粒尺寸减小到 1.22 ± 0.7 µm。使用修正的 Crussard-Jaoul (MC-J) 模型分析应变硬化过程,在 755°C 时获得最高应变硬化率。755°C 的高碳化物分数增加了铁素体位错密度并增强了铁素体相强度。铁素体中的高位错密度以及贝氏体和铁素体中较小的强度差异提高了755℃下的应变硬化速率。
更新日期:2020-08-27
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