Abstract
Armor grade Q&T steels very similar to AISI 4340 are used for construction of combat vehicles due to its high hardness, high strength to weight ratio and excellent toughness. The influence of friction welding parameters on microstructure and mechanical properties of such armor steel friction weld joints were evaluated. The microstructural properties of the various weld joint regions were examined by optical microscopy. It was also observed that the fully deformation zone (FDZ), the partially deformation zone (PDZ) and the heat affected zone (HAZ) have a vital effect on the tensile strength of the welded joints. Nearly 83 % of the tensile strength of the parent material (PM) can be achieved in friction welded joints. This is a 17 % higher strength than with the same parent material welded by shielded metal arc welding (SMAW) and flux cored arc welding (FCAW). The respective tensile and impact properties of the welded joints were correlated with the weld metal microstructures and fracture morphologies.
Kurzfassung
Ein angelassener Panzerstahl ähnlich zum Werkstoff AISI 4340 wird für die Konstruktion von Kampffahrzeugen verwendet, weil er eine hohe Härte, ein hohes Festigkeits-Gewichtsverhältnis und eine exzellente Zähigkeit besitzt. Es wurde der Einfluss der Parameter des Rührreibschweißens auf die Mikrostruktur und die mechanischen Eigenschaften der Panzerstahlverbindungen bestimmt. Die mikrostrukturellen Eigenschaften der verschiedenen Schweißnahtzonen wurden mittels Lichtmikroskopie untersucht. Es wurde beobachtet, dass die Voll- und die Teilverformungszone (Fully Deformation Zone (FDZ), Partially Deformation Zone (PDZ)) sowie die Wärmeeinflusszone (Heat Affected Zone (HAZ)) einen starken Einfluss auf die Festigkeit der Schweißverbindungen ausüben. Etwa 83 % der Festigkeit des Grundwerkstoffs (Parent Material (PM)) kann in den Rührreibschweißverbindungen erreicht werden. Dies ist etwa eine 17 % höhere Festigkeit bei dem gleichen Grundwerkstoff, als sie mittels Schutzgasschweißens (Shielded Metal Arc Welding (SMAW)) und Fülldrahtschweißens (Flux Cored Arc Welding (FCAW)) erreicht werden kann. Die entsprechenden Zug- und Impaktfestigkeiten wurden mit den Schweißnahtgefügen und der Bruchmorphologie korreliert.
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