Mechanical & Microstructural Analysis of Armor Steel Welded Joints

One of the main construction materials used in armor vehicles is Mil-A 46100 Armor Steel. The importance of the material arises from its mechanical properties such as hardness and explosive protection capability. MIG (Metal Inert Gas) welding technique is principally based on welding metals via electric arc where the arc is continous between metals and welding wire. In case welded metals are steel based materials, O2 and CO2 are added in portective gases in order to prevent unexpected welding defects. In MIG welding applications, the amount of ferrit in the chemical structure of the armor steel may result in some unexpected affects due to its decreasing characteristic on ductility and toughness. The welding wires used in MIG operations may exibit different fracture characteristics; as some specimen show ductile fracture characteristics, the rest may show brittle. Charpy Impact Test is one of the effective tests to determine the impact energy and the fracture times of welded metals. In this study, it is aimed to determine the relations between micro-structural results and fracture times of the welded parts of Mil-A 46100 steels via MIG applications.

Kaynakça

Balakrishnan M., Balasubramanian V., Reddy G. M. (2013), Effect of hardfaced interlayer thickness on ballistic performance of armour steel welds, Materials and Design, 44 (2013) 59–68.

Barényi I., Híreš O., Lipták P. (2011), International, Degradation Of Mechanical Properties Of Armoured Steels After Its Weldıng, Conference Of Scientific Paper AFASES 2011, Brasov, 26-28 May 2011.

Carrier J., Markiewicz H., Lebaillif, Leconte, Naceur, (2017) Influence of the heat affected zone on the dynamic behavior of a welded joint of armoured steel, International Journal of Impact Engineering 104 (2017) 154-163

Çelik Ç., IX.Kaynak kongresi Ulusal kongre ve sergisi bildiriler kitabı zırh çeliklerin kaynağında kaynak ağzı geometrisi ve ilave tel optimizasyonu, (Pg.89-94).

Gao W., Chen K., Guo X,, Zhang L.(2017) Fracture toughness of type 316LN stainless steel welded joints, Materials Science & Engineering A 685 (2017) 107–114.

Guo H., Wan J., Liu Y., Hao J., Experimental study on fatigue performance of high strength steel welded joints, Thin-Walled Structures 131 (2018) 45–54.

Kang L., Ge H., Kato T., Experimental and ductile fracture model study of single Groove welded joints under monotonic loading, Engineering Structures 85 (2015) 36–51.

Kara S., Korkut M.(2012), Zırhlı Muharebe Araçlarında Kullanılan Zırh Plakalarında Kaynak Sonrası Isıl İşlemin Birleşim Mukavemetine Etkisinin Araştırılması, The Journal of Defense Sciences, November 2012,Volume 11,Issue 2, 159-171, ISSN: 1303-6831.

Kelami Ş.M., Emre M.C., (2013) Zırh çeliklerinde kaynak sonrası ısı tesiri altında kalan bölgenin özelliklerinin ısıl işlem ile iyileştirilmesi, MSc Thesis, Istanbul Technical University Science and Technology Institute, June 2013.

Kraft, J. M., Correlation of plane strain toughness with strain-hardening characteristics of a low, medium, and a highstrength steel. Applied Materials Research 3, (1964).

Kurt S., Evci C., Işik H., Işik M.S.(2016) Farklı Kaynak Ağız Açılarının 307Si Elektroduyla Kaynak Edilmiş Mil-A 46100 Zırh Çeliğinin Mekanik Özelliklerine Etkisinin İncelenmesi,Çukurova University Journal of the Faculty of Engineering and Architecture, 31(ÖS 1), pp. SI 155-SI 162.

Lezcano R., Rodríguez C., Peñuelas I., Betegón C., Belzunce F.J., (2009), Effect of mechanical mismatching on the ductile-tobrittle transition curve of welded joints, Engineering Failure Analysis 16 (2009) 2576–2585.

Magudeeswaran G., Balasubramanian V., Reddy G. M. (2014) Effect of welding processes and consumables on fatigue crack growth behaviour of armour grade quenched and tempered steel joints, Defence Technology, 10 (2014) 47-59.

Ozdemir T., Eruslu O.S., Finite element modelling of crackable connecting rods at fracture splitting process, (2015) Mechanika Volume 21(2): 85−90.

Pramanick A.K., Das H., Reddy G.M., Ghosh M., Das G., Nandye S., Pal T.K. (2016) Development and design of microstructure based coated electrode for ballistic performance of shielded metal arc welded armour steel joints, Materials and Design, 103 (2016) 52–62.

Robledo D.M., Gómez J.S., Barrada J.G. (2011) Dyna, ano 78, Development Of A Welding Procedure For Mil A 46100 Armor Steel Joints Using Gas Metal Arc Welding, Medellín Agust 2011, Nro. 168, pp. 65-71, ISSN 0012-7353.

Saleh M., Kariem M., Luzin V., Topplerf K., Li H., Ruan D. (2018) High strain rate deformation of ARMOX 500T and effects on texture development using neutron diffraction techniques and SHPB testing, Materials Science & Engineering A, 709 (2018) 30–39.

Sarsilmaz F., Kirik I., Batı S.(2017), Microstructure and mechanical properties of armor 500/AISI2205steel joint by friction welding, Journal of Manufacturing Processes, 28 (2017) 131–136.

Sharma C., Upadhyay V., Dwivedi D. K., Kumar P., Mechanical properties of friction stir welded armor grade Al−Zn−Mg alloy joints, Trans. Nonferrous Met. Soc. China 27(2017) 493−506.

Thora E., Falkenreck M.K., Böllinghaus T.(2017), Dynamic compressive behaviour of weld joints, Materials Science & Engineering A, 702 (2017) 322–330.

US Patent, Military Specification Armor Plate, Steel, Wrought, High-Hardness MIL-A-461OOD(MR), 16 May 1988, Superseeding, 13 June 1983.

Wang H., S. Xu, Wang Y., Li A., Effect of pitting degradation on ductile fracture initiation of steel butt-welded joints, Journal of Constructional Steel Research 148 (2018) 436–449.

Yang Y., Shi L., Xu Z., Lu H., Chen X., Wanga X., Fracture toughness of the materials in welded joint of X80 pipeline steel, Engineering Fracture Mechanics 148 (2015) 337–349.

Kaynak Göster