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为研究钢内裂纹愈合机理,对经过热愈合处理的稀土Q235钻孔压缩试样的组织进行了光学显微镜和SEM电镜观察与分析.结果表明,低碳钢在热愈合过程中产生了两类耗散结构特征:基体中片状珠光体的溶解;裂纹愈合区组织的形成.分析认为,含内裂纹的低碳钢是远离平衡态的开放系统,热愈合过程中存在着反应扩散非线性基本条件,存在浓度起伏、结构起伏、能量起伏等涨落因素,因此导致了材料内部有序耗散结构的产生.
In order to study the mechanism of crack healing in steel, the microstructure and microstructure of Q235 bored RE-treated Q235 steel were observed and analyzed by light microscope and SEM. The results show that there are two types of low carbon steel during thermal healing Scattered structural features: dissolution of lamellar pearlite in the matrix and formation of tissue in the crack healing zone. It is considered that the open cracked mild steel is far away from the equilibrium state, and there are some basic conditions of reaction diffusion in the process of thermal healing , There are fluctuations in concentration, structural fluctuations, fluctuations in energy and other fluctuations, resulting in the formation of ordered material within the dissipative structure.