With the aid of a water-heater controllable in both temperature and time, the chemical etching method adding a bit hydrofluoric acid and xylene in traditional picric acid sa...

• 结果表明:利用控温控时水浴锅采用传统饱和苦味酸滴加微量氢氟酸和二甲苯的试剂可清晰显示不同状态下的奥氏体晶界。