Evaluation of Zero and Sub-zero Temperature Tensile and Impact Properties of Quenched and Tempered Steel Weldments  

作　　者：M.BALAKRISHNAN V.BALASUBRAMANIAN M.A.MUTHU MANICKAM 

机构地区：[1]Department of Mechanical Engineering,M.Kumarasamy College of Engineering(Autonomous),Thalavapalayam,Karur 639113,Tamil Nadu,India [2]Center for Materials Joining&Research(CEMAJOR),Department of Manufacturing Engineering,Annamalai University,Annamalainagar 608002,Tamil Nadu,India [3]Combat Vehicles Research and Development Establishment(CVRDE),Avadi,Chennai 600054,Tamil Nadu,India

出　　处：《Journal of Iron and Steel Research International》2016年第11期1177-1187,共11页

基　　金：the Armament Research Board(ARMREB),Directorate of Armaments,Ministry of Defense,New Delhi,Government of India for providing financial support to carry out this investigation through a CARS project,No.CVRDE/MMG/2011-2012/003/CARS dated 23rd May 2011

摘　　要：Combat vehicles using armour grade quenched and tempered （Q＆T） steel are needed to be operated under different climatic conditions. However, the properties meeting the room temperature test conditions may not neces-sarily be required to meet the low temperature operating conditions. The influences of shielded metal arc welding （SMAW） process, flux cored arc welding （FCAW） processes and test temperatures below room temperature up to 60℃ on tensile and impact toughness properties of armour grade Q＆T steel welds were reported. The tensile and impact properties of the joints showed incremental trend with respect to the decrement in test temperature up to -40℃ irrespective of the welding processes used. The increment in tensile and impact properties of SMAW and FCAW joints subjected to the low temperature environment is due to plastic strain-induced phase transformation of retained austenite into martensite phase. Among the two processes, SMAW process welded joint showed better tensile and impact properties than its FCAW counterpart joints.Combat vehicles using armour grade quenched and tempered （Q＆T） steel are needed to be operated under different climatic conditions. However, the properties meeting the room temperature test conditions may not neces-sarily be required to meet the low temperature operating conditions. The influences of shielded metal arc welding （SMAW） process, flux cored arc welding （FCAW） processes and test temperatures below room temperature up to 60℃ on tensile and impact toughness properties of armour grade Q＆T steel welds were reported. The tensile and impact properties of the joints showed incremental trend with respect to the decrement in test temperature up to -40℃ irrespective of the welding processes used. The increment in tensile and impact properties of SMAW and FCAW joints subjected to the low temperature environment is due to plastic strain-induced phase transformation of retained austenite into martensite phase. Among the two processes, SMAW process welded joint showed better tensile and impact properties than its FCAW counterpart joints.

关 键 词：shielded metal arc welding flux cored arc welding low temperature property microstrncture： hardness 

分 类 号：TJ810.4[兵器科学与技术—武器系统与运用工程] TG457.11[金属学及工艺—焊接]