Effect of non-metallic inclusions on butterfly wing initiation, crack formation, and spall geometry in bearing steels

2015 ◽  
Vol 80 ◽  
pp. 203-215 ◽  
Author(s):  
Sina Mobasher Moghaddam ◽  
Farshid Sadeghi ◽  
Kristin Paulson ◽  
Nick Weinzapfel ◽  
Martin Correns ◽  
...  
Keyword(s):  
Crack Formation ◽  
Butterfly Wing ◽  
Bearing Steels ◽  
Metallic Inclusions

Effect of non-metallic inclusions (NMI) on crack formation in forged steel

2020 ◽  
Author(s):  
Vasundhara Singh ◽  
Rashul khan ◽  
Bharath Bandi ◽  
Gour.G. Roy ◽  
Prakash Srirangam
Keyword(s):  
Crack Formation ◽  
Metallic Inclusions

scholarly journals Research of Microstructure of Molybden Doped Weldings of Oil and Gas Pipelines

2021 ◽  
Vol 29 (4) ◽  
pp. 274-279
Author(s):  
Iveta Pandova ◽  
Miroslav Rimar ◽  
Valery Makarenko ◽  
Yuri Vinnikov ◽  
Andrey Mangura ◽  
...  
Keyword(s):  
Weld Metal ◽  
Crack Formation ◽  
Oil And Gas ◽  
Laboratory Equipment ◽  
Plastic Properties ◽  
Alloyed Element ◽  
Metallic Inclusions ◽  
Technological Developments ◽  
Scientific Technical

Abstract Still existing scientific, technical and technological developments to improve the quality of welded joints of metal pipe structures contain contradictions and uncertainty about the effects of alloying elements, such as molybdenum, mechanical and visco-plastic properties, as well as metallographic component joints. All this indicates the need for a systematic study of these problems for the development of rational metallurgical and technological measures to significantly improve the technological and corrosion-mechanical properties of weld metal. Metallographic studies, using laboratory equipment with high identifying ability, found that the doping of weld metal with molybdenum in the amount of 0.2-0.4% causes fragmentation of ferrite-pearlite structure, including carbides Mn and Fe, and also reduces the number and size of non-metallic inclusions – sulfides, oxides and silicates. Moreover, non-metallic inclusions have a dispersed appearance, which promotes plasticization of the structure, which directly increases the viscous-plastic characteristics and resistance of the metal joints to crack formation. Based on the results of metallographic research, the optimum content in the weld metal of the alloyed element – molybdenum, which is 0.2-0.4%, is determined.

scholarly journals Size of Non-Metallic Inclusions in High-Grade Medium Carbon Steel

2014 ◽  
Vol 14 (4) ◽  
pp. 55-60 ◽  
Author(s):  
T. Lipiński ◽  
A. Wach
Keyword(s):  
Raw Materials ◽  
Extraction Methods ◽  
Medium Carbon Steel ◽  
Graphical Form ◽  
Test Results ◽  
Medium Carbon ◽  
Bearing Steels ◽  
Metallic Inclusions ◽  
Chemical Composition Of Steel ◽  
Strength And Durability

Abstract Non-metallic inclusions found in steel can affect its performance characteristics. Their impact depends not only on their quality, but also, among others, on their size and distribution in the steel volume. The literature mainly describes the results of tests on hard steels, particularly bearing steels. The amount of non-metallic inclusions found in steel with a medium carbon content melted under industrial conditions is rarely presented in the literature. The tested steel was melted in an electric arc furnace and then desulfurized and argonrefined. Seven typical industrial melts were analyzed, in which ca. 75% secondary raw materials were used. The amount of non-metallic inclusions was determined by optical and extraction methods. The test results are presented using stereometric indices. Inclusions are characterized by measuring ranges. The chemical composition of steel and contents of inclusions in every melts are presented. The results are shown in graphical form. The presented analysis of the tests results on the amount and size of non-metallic inclusions can be used to assess them operational strength and durability of steel melted and refined in the desulfurization and argon refining processes.

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