Abstract
Premature failure of a bending cylinder bushing in a plate mill was investigated in this study. Visual, chemical and microscopic analyses were performed to detect the possible reasons of this failure and possible measures to be taken were mentioned not to be encountered for this type of failures in the future. No traces of welding were observed in the performed studies. Intensive elongated MnS inclusions, fatigue striations and splits from the grain boundaries were detected in the microstructural investigations. It was also proved that the base of the bushing was worked without chamfering. The importance of the removing hydrogen from the structure by annealing to decrease the hydrogen brittleness risk which would occur after the chromium coating process, and the chamfering of the bushing base to decrease the crack susceptibility was stressed.
References
- SOPPA, E.A., KOHLER, C., ROOS, E., “Fatigue Mechanisms in an Austenitic Steel under Cyclic Loading: Experiments and Atomistic Simulations”, Materials Science and Engineering A, 597, 128-138, 2014.
- HINTIKKA, J., LEHTOVAARA, A., MÄNTYLÄ, A., “Fretting Fatigue and Friction of Quenched and Tempered Steel in Dry Contact with Aluminum Bronze”, Wear, 308, 155-165, 2013.
- BAGHERIFARD, S., GUAGLIANO, M., “Fatigue Behavior of a Low-Alloy Steel with Nanostructured Surface Obtained by Severe Shot Peening”, Engineering Fracture Mechanics, 81, 56-68, 2012.
Abstract
Bu çalışmada bir levha haddehanesinde eğme silindiri kovanında meydana gelen erken hasar incelenmiştir. Oluşan bu hasarın sebeplerini tespit etmek için görsel, kimyasal ve mikroskobik analizler yapılmış ve gelecekte bu tip hasarlarla karşılaşmamak için alınması gereken tedbirlerden bahsedilmiştir. Gerçekleştirilen çalışmalarda herhangi bir kaynak izine rastlanılmamıştır. Yapılan mikroskobik incelemelerde, şiddetli bir şekilde uzamış MnS inklüzyonları, yorulma adımları ve tane sınırlarından ayrılmalar belirlenmiştir. Ayrıca kovan tabanının pah kırılmadan işlendiği de tespit edilmiştir. Krom kaplama prosesinden sonra oluşabilecek hidrojen gevrekliği riskini azaltmak için tavlama ile yapıdan hidrojenin uzaklaştırılmasının ve çatlak hassasiyetini azaltmak için kovan tabanında pah kırmanın önemi vurgulanmıştır.
References
- SOPPA, E.A., KOHLER, C., ROOS, E., “Fatigue Mechanisms in an Austenitic Steel under Cyclic Loading: Experiments and Atomistic Simulations”, Materials Science and Engineering A, 597, 128-138, 2014.
- HINTIKKA, J., LEHTOVAARA, A., MÄNTYLÄ, A., “Fretting Fatigue and Friction of Quenched and Tempered Steel in Dry Contact with Aluminum Bronze”, Wear, 308, 155-165, 2013.
- BAGHERIFARD, S., GUAGLIANO, M., “Fatigue Behavior of a Low-Alloy Steel with Nanostructured Surface Obtained by Severe Shot Peening”, Engineering Fracture Mechanics, 81, 56-68, 2012.
Details
| Subjects | Material Production Technologies |
|---|---|
| Journal Section | Materials and Metallurgical Engineering |
| Authors | |
| Publication Date | July 15, 2016 |
| Submission Date | May 9, 2016 |
| Acceptance Date | June 27, 2016 |
| Published in Issue | Year 2016 Volume: 5 Issue: 2 |