气体渗碳后直接淬火的渗碳试棒,渗层组织中残留有大量白色的残余奥氏体,这些奥氏体与白亮色的碳化物混在一起,影响对碳化物级别的准确评定。我厂金相室在用砂轮切割机切割试棒时,通过减少冷却液供给量和加快切割速度的方法,使得试棒下半部局部回火,促使残余奥氏体发生分解,从 After carburizing carburizing directly quenched carburizing test bar, the infiltration of tissue left a large number of white residual austenite, austenitic and white bright color carbide mixed together, affecting the accurate assessment of carbide grade. Metallurgical plant in our cutting wheel with a cutting wheel test bar, by reducing the amount of coolant supply and speed up the cutting speed of the method, so that the lower part of the test tube partial tempering, prompting the decomposition of retained austenite, from