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النتردة كأسلوب لإطالة عمر الأجزاء المعرضة لتحميل كلال متغير | ||
| Engineering and Technology Journal | ||
| Article 1, Volume 26, Issue 12, 2008, Pages 510-523 PDF (2.25 M) | ||
| DOI: 10.30684/etj.26.12.13 | ||
| Author | ||
| امين دواي التميمي | ||
| Abstract | ||
| This study has aimed to illustrate the effect of one surface hardening method( Nitriding) upon fatigue life time of medium carbon steel alloys . Therefore all tests. concerning round bending of fatigue ,have been conducted at ordinary laboratory circumstances , within amean stress , [ value = 0&stress ratio ,R = -1], as stable and changing stress capacities , were forced in order to know the metal resistance to these stresses under the different dynamic loading .There by to give the safety life time of this metal , nitriding process (liquid & Gas ) was carried out to the metal ,which contributed in improving the fatigue resistance , as the improvement amount was based on the hardened depth , and the fatigue boundary , increases with nitriding layer depth . strength tests, micro and hardening were carried out for the applied heat treatment circumstances ,because these tests are considered to be as criteria and connected with revelant correlation , concerning fatigue tests results . Actually , micro structure examination has carried often before treatment , where as the micro structure was found before treatment [ ferrit & perlite ] while nitrogen phases were observed to be high with a layer of crome iron nitrides on the treated service with nitriding , that confirm the nitriding role in structural barriers formation on the service , that acts on stopping towards the crack.. Consequently, the images of (SEM) , regarding the fracture service , have declared a follow up images towards fatigue cracks . This crack is originated under the thick hardened serface.Layer and developes , is a lease plastic region , as it was detected that fatigue life time , increases when loading from (high – low ) at the changing capacity of fatigue tests rather than( Low- High). | ||
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