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目前各厂在铸造生产中广泛采用代表性试棒以检验其机械性能。一般说来,试棒的代表性以钢的和有色金属的试棒较好,因为它们是间歇式定量熔炼的,化学成分均匀而且易于控制,铸件壁厚与试棒的差别仅在于晶粒的粗细和组织疏松程度上的差别,这些差别可以通过适当的热处理来使它缩小。但是对于铸铁来说,化学成分和铸件壁厚上的差别会引起相的变化,使奥氏体分解成珠光体或铁素体
At present, a wide range of test bars are widely used in the foundry industry to test the mechanical properties of the test bars. In general, the test bar is representative of steel and non-ferrous metal test bars is better, because they are intermittent quantitative melting, chemical composition uniformity and easy to control, the casting wall thickness and the test rod only lies in the grain The difference between the degree of thickness and the degree of looseness of the tissue, these differences can be reduced by appropriate heat treatment to make it. However, for cast iron, the difference between the chemical composition and the wall thickness of the casting causes a phase change that causes the austenite to decompose into pearlite or ferrite