Abstract:
17MnNiVNbR steel plates were welded by means of SMAW and SAW, and tensile, impact, drop-weight and the crack tip opening displacement (CTOD) tests were operated on welded joints. The microstructure of weld seam and heat affected zones (HAZ) was investigated by optical microscopy. The results show that welded joints after (570±15) ℃×1 h heat treatment had excellent comprehensive mechannical properties and could reach the GB requirement. Microstructure of weld seam consisted of proeutectoid ferrite, acicular ferrite and granular bainite, and microstructure of heat affected zone was coarse bainite.