Effect of welding processes and consumables on fatigue crack growth behaviour of armour grade quenched and tempered steel joints

作     者：G.MAGUDEESWARAN V.BALASUBRAMANIAN G.MADHUSUDHAN REDDY 

作者机构：Department of Mechanical Engineering PSNA College of Engineering & Technology Kothandaraman Nagar Muthanampatti Centre for Materials Joining & Research Department of Manufacturing Engineering Annamalai University Metal Joining Group Solidification Technology Division Defence Metallurgical Research LaboratoryKanchanbagh 

出 版 物：《Defence Technology（防务技术）》 (Defence Technology)

年 卷 期：2014年第10卷第1期

页      面：47-59页

学科分类：0806[工学-冶金工程] 0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 0703[理学-化学] 0701[理学-数学] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：New Delhi for funding this project work(Project No MAA/03/41) 

主　　题：焊接工艺 疲劳裂纹 扩展行为 消耗品 钢接头 装甲 回火 淬火 

摘      要：Quenched and Tempered(Q&T) steels are widely used in the construction of military vehicles due to its high strength to weight ratio and high hardness. These steels are prone to hydrogen induced cracking(HIC) in the heat affected zone(HAZ) after welding. The use of austenitic stainless steel(ASS) consumables to weld the above steel was the only available remedy because of higher solubility for hydrogen in austenitic phase. The use of stainless steel consumables for a non-stainless steel base metal is not economical. Hence, alternate consumables for welding Q&T steels and their vulnerability to HIC need to be explored. Recent studies proved that low hydrogen ferritic steel(LHF) consumables can be used to weld Q&T steels, which can give very low hydrogen levels in the weld deposits. The use of ASS and LHF consumables will lead to distinct microstructures in their respective welds. This microstructural heterogeneity will have a drastic influence in the fatigue crack growth resistance of armour grade Q&T steel welds. Hence, in this investigation an attempt has been made to study the influence of welding consumables and welding processes on fatigue crack growth behaviour of armour grade Q&T Steel joints. Shielded metal arc welding(SMAW) and Flux cored arc welding(FCAW) were used for fabrication of joints using ASS and LHF consumables. The joints fabricated by SMAW process using LHF consumable exhibited superior fatigue crack growth resistance than all other joints.