摘要:
对添加不同含量V的Q235钢试样,采用钻孔压缩方法获得内裂纹,然后对其进行热愈合试验,研究了V对试样热愈合和形态演化的影响。扫描电镜分析结果表明,添加微量V的Q235钢在加热温度为800℃条件下,产生了明显的愈合,当V添加量为0.1%时,愈合效果最好。V添加到基体材料后,部分V固溶于基体,降低了基体金属Fe原子的扩散激活能,加剧了Fe的自扩散。分析认为,钢内裂纹愈合机理主要是扩散反应导致的热愈合及随后的修复结晶过程。在研究钢内裂纹愈合时,需采用系统科学的方法,对基体及裂纹区组织同时进行研究。
关键词:
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Q235钢 /
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内裂纹 /
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V /
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热愈合
Abstract:
Thermal healing experiment of inner cracks made by compressing a drilled hole on samples of Q235 steel with various vanadium addition was carried out.The effects of vanadium on inner cracks thermal healing and morphology evolution were investigated.SEM analysis results displayed that inner crack samples have apparent healing at 800℃ and the healing is best with 0.1% vanadium addition.After vanadium added to the matrix partial of it is soluted in the matrix.The soluted vanadium reduces the activation energy for diffusion of Fe atoms,accelerates the self-diffusion of Fe atoms.The primary mechanism of inner crack healing in metals is diffusion thermal healing and the recrystallization.It requires the systemic method to research the microstructure both of the crack zone and the matrix of internal cracks healing in the steel.
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