Effect of processing conditions on microstructural features in Mn–Si sintered steels

摘要: Sintering of steels containing oxidation sensitive elements is possible if such are alloyed with others which present lower affinity for oxygen. In this work, a master alloy powder Fe-Mn-Si-C, specifically designed to create liquid phase during sintering, has been used purpose. The effect processing conditions as sintering temperature and atmosphere was studied the aim describing microstructural evolution well morphology distribution oxides in sintered material, evaluating potential detrimental on mechanical properties. Chemical analyses, metallography fractography studies combined X-ray photoelectron spectroscopy analyses fracture surfaces were reveal main mechanism their correlation chemical composition different surfaces. results indicate that failure these brittle surrounding original particles due degradation grain boundaries by presence oxide inclusions. Mn-Si inclusions observed intergranular decohesive facets. use reducing atmospheres high temperatures reduces amount size Besides, heating cooling rates reduce significantly final oxygen content material. A model microstructure development stages proposed, considering fact when melts, formed can dissolve some surface iron base particles.