Welding thermal cycling influence on crack resistance, structure and hardness for low-alloy high strength steel
Abstract
Vickers micro hardness measurement was done on nine hard probes of welded samples of lowalloyed 14H2GMR steel and on one sample of low-carbon St3sp steel using the PMT-5 equipment. An investigation was carried out to see the thermal cycling influence on the HAZ. It was discovered that, welding at 40°C does not lead to a significant increase of its micro hardness as compare welding at +20°C despite the large difference in cooling rates. It was also discovered that, the crack grows mainly along the grain boundaries of martensite and bainite (as overchilled austenite), but in some places passes through the body of grain and cuts across it for 14H2GMR steel. For St2sp steel the intergranular cracks are revealed both in weld metal and in the heat affected zone nevertheless of milder test conditions against hard technological probes.
Keywords
Supporting agencies: the study was performed within the framework of the scientific project No. III.28.1.1 of program III.28.1 of the SB RAS
About the Authors
Samuel Bisong Mbelle
Douala University
Cameroon
Cameroon
Vladimir Egorovich Mikhailov
North-Eastern Federal University
Russian Federation
Russian Federation
Valeriy Valer’evich Lepov
V.P. Larionov’s Institute of the physical and engineering problems of the North, Siberian Department of Russian academy of sciences
Russian Federation
Russian Federation
Susanna Nikolaevna Makharova
V.P. Larionov’s Institute of the physical and engineering problems of the North, Siberian Department of Russian academy of sciences
Russian Federation
Russian Federation
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Review
For citations:
Mbelle S.B., Mikhailov V.E., Lepov V.V., Makharova S.N. Welding thermal cycling influence on crack resistance, structure and hardness for low-alloy high strength steel. Arctic and Subarctic Natural Resources. 2018;23(1):54-59. (In Russ.)
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