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

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 o...

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Bibliographic Details
Published inJournal of iron and steel research, international Vol. 23; no. 11; pp. 1177 - 1187
Main Authors BALAKRISHNAN, M., BALASUBRAMANIAN, V., MANICKAM, M.A. MUTHU
Format Journal Article
LanguageEnglish
Published Singapore Elsevier Ltd 01.11.2016
Springer Singapore
Subjects
Applied and Technical Physics
Engineering
flux cored arc welding
hardness
low temperature property
Machines
Manufacturing
Material
Materials Engineering
Materials Science
Metallic Materials
microstructure
Physical Chemistry
Processes
shielded metal arc welding
shielded metal arc welding
hardness
microstructure
low temperature property
flux cored arc welding
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Summary: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.
Bibliography:11-3678/TF
shielded metal arc welding; flux cored arc welding; low temperature property; microstrncture： hardness
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.
ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(16)30173-X