The effect of post weld heat treatment on deposits obtained from supermartensitic stainless steel metal cored wire properties

SEBASTIÁN ZAPPA, HERNÁN G. SVOBODA, MABEL RAMINI DE RISSONE, ESTELA S. SURIAN, LUIS A. DE VEDIA

SOLDAGEM E INSPEçãO

Asociación Brasilera de Soldadura

Lugar: San Pablo; Año: 2007 vol. 12 p. 115 - 123

0104-9224

The effect of different post weld heat treatments on mechanical properties and microstructure of deposits obtained from MCAW supermatensitic all-weld metal was studied. The deposits were obtained using Ar 70 %-He 30 % shielding gas mixture and an average heat input of 1.2 kJ/mm, in the flat welding position. The samples were submitted to temperatures between 580 to 680 ºC for 3, 5, 10, 15 and 30 minutes. Tensile properties, Vickers microhardness and Charpy-V notch toughness at 20 and -60 ºC were measured and the microstructure was studied with both optical and electron microscopy and X rays diffraction (XRD). Important variations of 0.2 % yield stress and hardness were obtained. Tensile properties increased as well as decreased when compared to as welded condition. Charpy-V values did not significantly vary with the heat treatment. These variations could be associated to precipitation and austenite transformation during the PWHT phenomena.