研究了车轮钢中白点的形成过程，制备了白点裂纹的真实断口，并和含白点试样的各种断口进行了对比。结果表明，先形成氢鼓泡，然后从鼓泡壁产生微裂纹，它们连接形成白点。白点断口和含白点试样的断口概念不同，前者为准解理，和氢致滞后开裂断口相同，但后者则依赖断裂方式和试样厚度。钢中白点除了产生二次裂纹外，对各种断口形貌均没有影响。车轮钢的滞后断裂由原子氢引起和白点无关。
Forming process of flaking in a wheel steel has been investigated. The cracking surface of the flacking is got using a special method, and is compared to various fracture surfaces of samples containing flaking. The results show that a cavity with H2, i.e. hydrogen blistering, forms and grows firstly, then microcracks initiate from the wall of the blistering, grow and connect each other resulting in formation of flaking. The cracking surface of flaking is a different idea with fracture surface of the sample containing flaking. The former is quasi-cleavage, similar to that of hydrogen-induced delayed cracking, but the later is dependent upon the failure method and the thickness of the sample. There is no effect of flaking in the steel on various fracture surface morphologies besides secondary cracks. Hydrogen-induced delayed failure is due to atomic hydrogen instead of flaking.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] |
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