Textural Analysis during Annealing of a Plain Low Carbon Steel Q235 Processed by Different Thermal Mechanical Processing Schedules
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摘要: 利用掃描電鏡、背散射電子衍射(EBXD)和X射線衍射技術研究了三種方式熱變形后保溫時鐵素體的長大行為.結果表明,回復、再結晶和長大的相對程度與第二相粒子的狀態及鐵素體的取向分布有關.形變強化相變產生的超細鐵素體中形變儲存能較低,退火時難以發生靜態再結晶,而以晶粒長大為主,鐵素體因第二相出現較晚而充分生長:A1溫度以下純鐵素體區形變的鐵素體雖然形變儲存能最高,形變量最大,但第二相釘扎最明顯,鐵素體僅發生部分再結晶,<111>取向形變晶粒比<100>取向形變晶粒更明顯地被削弱;α+γ兩相區形變時,鐵素體(亞)晶粒發生回復式長大,<111>取向晶粒和<100>取向晶粒有不同的再結晶傾向.Abstract: The growth behavior of ferrite grains under three different thermal mechanical processing schedules was investigated by SEM, EBSD (electron back scattering diffraction) and X-ray diffraction techniques. Results show that the relative contribution of recovery, recrystallization and grain growth was related with the status of second-phase particles and the orientations of ferrite grains. The ultra-fine ferrite grains produced by deformation-enhanced transformation had less driving force to recrystallize since less stored energy was left after deformation. They grow apparently because of the late precipitation of second-phase particles. Although ferrite deformed below A1 temperature gained the highest stored energy and strongest texture, only partial recrystallization occurred in such grains because of the effective pinning of second-phase particles. The intensity of <111> fiber texture decreases more apparently than that of <100> fiber texture. When deformed at α+γ dual-phase region, the ferrite grains grew in the way of recovery. The recrystallization tendencies of grains with <111> and <100> orientations are different.
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Key words:
- deformation /
- texture /
- recrystallization /
- grain growth
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