Microstructure Evolution and Properties of Q235 Plain Carbon Steel in Multi-pass Hot Deformation
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摘要: 利用熱模擬壓縮變形實驗研究了Q235碳素鋼多道次熱變形及后續處理過程的組織演變規律.結果表明,采用高溫奧氏體的形變再結晶及過冷奧氏體的形變強化相變,可以使Q235低碳鋼的鐵素體晶粒細化至4-5μm,材料的屈服強度達到400MPa級,延伸率達到40%.經適當的后續處理后,滲碳體、珠光體等第二組織彌散分布于細晶鐵素體晶界上,使Q235低碳鋼在保持細晶鋼原有強度級別和塑性的基礎上,屈強比有效降低.Abstract: The microstructure evolution of Q235 plain carbon steel in multi-pass hot deformation was investigated by means of hot compression simulation. The results indieate that fine ferrite grains of 4-5 μm can be achieved by deformation enhanced phase transformation of undercooled austenite in combination with austenitic recrystallization. The yield strength exceeded 400 MPa and the plastic elongation was over 40%. By proper heat treatment after deformation the scattered minor microstructures of cementite and pearlite were distributed on the grain boundaries of fine ferrite grains. The yield ratio was effectively decreased without loss of yield strength and the ductility.
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