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使用聚合物(PAG)水溶液和气泡塔,研究了气液混合液的特性及气泡对淬火开裂的影响。淬裂试样为带凸缘的SUJ2钢园柱体。试验表明,当过滤器为5～15μm规格时,在0.1～10％浓度的PAG水溶液中,PAG起界面活性剂作用,使溶液表面张力较水显著降低,气泡直径减小。故由于气泡作用,蒸汽膜持续时间被延长,冷却速度亦较无气泡时为小。当PAG水溶液为低浓度时,均产生横向开裂;溶液浓度为10～15％且带有气泡时,产生纵向开裂的倾向较大;溶液浓度为20％时,则均产生纵向开裂。
Using polymer (PAG) aqueous solution and bubble column, the characteristics of gas-liquid mixture and the influence of bubble on quenching and cracking were studied. Hardened crack specimens are flanged SUJ2 steel cylinder columns. Experiments show that when the filter is in the range of 5 ~ 15μm, PAG acts as a surfactant in 0.1% ~ 10% PAG aqueous solution, and the surface tension of the solution decreases significantly compared with that of water. The bubble diameter decreases. Therefore, due to the action of the bubble, the duration of the steam film is prolonged, and the cooling rate is smaller than that of the bubbleless bubble. When the concentration of PAG aqueous solution is low, all have transverse cracking. When the solution concentration is 10-15% and the bubbles are bubbled, longitudinal cracking tends to be larger. When the solution concentration is 20%, longitudinal cracking occurs.