本文小结了用加烷基苯磺酸钠的苦味酸水溶液对近二十种合金结构钢、含硼钢和碳素钢进行直接腐蚀法显现奥氏体晶粒度的初步试验结果;摸索了这一浸蚀剂的特性;试验了奥氏体化处理温度、冷却速度及回火对显示奥氏体晶界的影响;提出了用这种浸蚀剂时,在操作中的体会;并试图对腐蚀机理进行讨论。 This article summarizes the preliminary results of direct corrosion of nearly 20 kinds of alloy structural steel, boron-containing steel and carbon steel with austenite grain size by the addition of picric acid aqueous solution of sodium alkylbenzenesulfonate; The characteristics of an etchant; the effect of austenitizing temperature, cooling rate and tempering on the austenite grain boundaries was tested; the experience with this etchant was put forward; Corrosion mechanism for discussion.