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通过显微组织观察、X射线物相分析以及硬度和3.5%Na Cl水溶液浸泡失重等实验方法研究了铝镀层/60Si_2Mn A钢试样淬火和回火处理前后的组织结构和性能。结果表明:热浸镀铝获得的铝镀层/60Si_2Mn A钢试样经920℃淬火和480℃回火后,表层的组织结构由外层含有Al_2O_3膜和Fe-Al相的多孔层、内层呈白亮的铝固溶层和基体的回火屈氏体组成,外层和内层间结合牢固、没有出现裂纹。表层的硬度梯度由最外层的高硬度,800~934 HV快速地降低到内层的低硬度区,尔后在基体区域稍有增加后保持不变,约为420 HV,以及在3.5%Na Cl溶液中的耐蚀性将提高73%。并且,淬火加热时间还将对表层的组织结构和性能产生一定程度的影响。
The microstructure and properties of the aluminum coating / 60Si2Mn A steel before and after quenching and tempering were investigated by means of microstructure observation, X-ray phase analysis and hardness and immersion weight loss in 3.5% NaCl aqueous solution. The results show that the microstructure of the aluminum coating / 60Si_2Mn A steel obtained by hot dip aluminizing is quenched at 920 ℃ and tempered at 480 ℃. The microstructure of the surface layer consists of a porous layer of Al 2 O 3 film and Fe-Al phase in the outer layer, White bright aluminum solid solution layer and the body tempering troostite composition, the outer layer and the inner layer with a solid, there is no crack. The hardness gradient of the surface layer rapidly decreases from the outermost high hardness of 800 ~ 934 HV to the low hardness region of the inner layer, and then remains constant after a slight increase in the base region, about 420 HV, with 3.5% NaCl Corrosion resistance in solution will increase 73%. And, the quenching time will also have a certain degree of influence on the surface microstructure and properties.