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即使对于经验丰富的检验者来说,在黑白衬度下辨别等温淬火球铁的各种相也是困难的。在等温淬火球铁的基体上,奥氏体、未溶铁素体和共晶碳化物都是白色,这些相难以相互区别。有一种简单的方法解决这一问题。采用这种方法,可使各种相呈现不同的颜色。方法如下: 将等温淬火试样按通常的方法制样,抛光后用2—4％的硝酸酒精溶液浸蚀。浸蚀的目的是使相界分明,而不是为了着色。浸蚀
Even for experienced testers, it is difficult to distinguish the various phases of isothermally-tempered ductile irons in black and white contrast. Austenitic, undissolved ferrite and eutectic carbides are all white on the substrate of the isothermal quenched ductile iron, which are difficult to distinguish from each other. There is a simple way to solve this problem. With this method, the various phases can appear in different colors. Method is as follows: the sample isothermal quenching the usual way, polished with 2-4% nitric acid solution etching. The purpose of etching is to clarify the phase boundary, not for coloring. Etched