Year: 2008
Type: article
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 alltests. concerning round bending of fatigue ,have been conducted at ordinarylaboratory circumstances , within amean stress , [ value = 0&stress ratio ,R = -1],as stable and changing stress capacities , were forced in order to know the metalresistance to these stresses under the different dynamic loading .There by to givethe safety life time of this metal , nitriding process (liquid & Gas ) was carried outto the metal ,which contributed in improving the fatigue resistance , as theimprovement amount was based on the hardened depth , and the fatigue boundary ,increases with nitriding layer depth . strength tests, micro and hardening werecarried out for the applied heat treatment circumstances ,because these tests areconsidered to be as criteria and connected with revelant correlation , concerningfatigue tests results .Actually , micro structure examination has carried often before treatment ,where as the micro structure was found before treatment [ ferrit & perlite ] whilenitrogen phases were observed to be high with a layer of crome iron nitrides on thetreated service with nitriding , that confirm the nitriding role in structural barriersformation on the service , that acts on stopping towards the crack..Consequently, the images of (SEM) , regarding the fracture service , havedeclared a follow up images towards fatigue cracks . This crack is originated underthe thick hardened serface.Layer and developes , is a lease plastic region , as it wasdetected that fatigue life time , increases when loading from (high – low ) at thechanging capacity of fatigue tests rather than( Low- High).
Author: التميمي, امين دواي
Language: Arabic
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W3089033095