The performance of multiphase steels is closely related to their microconstituents. Thus, the characterization and effective control of the microstructure of these materials are crucial, and chemical attack processes are essential for this to occur. In this context, this study sought to employ the Taguchi method to evaluate the chemical etching process with the LePera reagent in order to investigate the influence of different process variables, in addition to the interactions between them, on the quality of the image obtained. The variables analyzed were: concentration of picral (CP) and sodium metabisulfite (CSM) solution, pre-attack (PA), drying mode (DM) and attack time (AT). in addition to the relative humidity and temperature of the environment. Therefore, a quality index (QI) was suggested for the images obtained, which, together with the analysis of variance, indicates the best route for microstructural characterization of TRIP800 steel (CP-4.0%; CSM-0.5% ; PA-No; DM-Natural; AT-25s; . Temperature (C): 15I---25 and Relative humidity (%): 55I---90). In addition to indicating the variables that most influence the process. The influence of noise factors (temperature and relative humidity) was also proven.

多相钢的性能与其微观成分密切相关。因此，对这些材料的微观结构进行表征和有效控制至关重要，而化学侵蚀过程对于这一点的发生至关重要。在这种情况下，本研究试图采用田口方法来评估 LePera 试剂的化学蚀刻过程，以研究不同过程变量的影响，以及它们之间的相互作用，对获得的图像质量的影响。分析的变量是：苦味醛 (CP) 和焦亚硫酸钠 (CSM) 溶液的浓度、预浸渍 (PA)、干燥模式 (DM) 和浸渍时间 (AT)。除了环境的相对湿度和温度。因此，建议为获得的图像使用质量指数（QI），其中，连同方差分析，表明了 TRIP800 钢微观结构表征的最佳途径（CP-4.0%; CSM-0.5% ; PA-No; DM-Natural; AT-25s; . 温度 (C): 15I--- 25 和相对湿度 (%): 55I---90)。除了指出对过程影响最大的变量。噪声因素（温度和相对湿度）的影响也得到了证实。