The correctness of those conclusions is proved by theresults of metallographic observations and hardness tests of the dissimilar steel welded joint ofCr30Ni9/high carbon steel.
利用异种钢接头的金相观察和硬度测试结果，验证了所得结论的正确性。
Fatigue tests were performed using the 3d dumbbell specimens with different levels of maximum strain and hardness.
使用具有不同最大应变和各种硬度的3d哑铃状试样进行了疲劳试验。
On the basis of a series of tests, the optimum paste was obtained and the way to enhance hardness of the layer was studied.
在大量试验的基础上，优选出了渗铬膏剂的配方，并且研究了提高渗铬层硬度的方法。
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