Performance of Thin Plate 310S Stainless Steel Welded Joints
The work aims to study the microstructure and mechanical properties of welded joints of thin plate 310S stainless steel.In this paper,manual tungsten inert gas arc welding was applied to weld 310S stainless steel and obtain HR3C welding wire welded joints.Room temperature tensile tests,high temperature tensile tests,and high temperature creep property tests were conducted on the welded joints,and the microstructure and fracture morphology of the joints were analyzed.The changes in Fe and Cr elements within the crystal of the weld metal in the welded joint were significant,and Cr elements were enriched at the dendrite boundary.The tensile strength of 310S stainless steel welded joints at room temperature and 850℃ tensile condi-tions was 300 and 140 MPa respectively;At creep temperature of 850℃ and creep stress of 50 MPa,the average creep fracture time was 26.7 hours.After high-temperature creep testing of welded joints,there were coarse chromium rich phases on the grain boundaries,and nano phases randomly distributed at the grain boundaries and within the grains.The 310S stainless steel HR3C welding wire joint has good room temperature mechanical properties,with good high-temperature tensile and creep properties at 850℃.The nano phase in the weld impedes dislocation movement,improving the high-temperature tensile and creep properties of the joint weld microstructure.
310S stainless steeltungsten inert gas arc weldinghigh temperature mechanical propertieshigh temperature creepmicrostructurenano phase
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