Open AccessMicrostructure and Mechanical Properties of Welded Joints in Austenitic Steel TP347HFG after Operation
Author(s) -
Kwiryn Wojsyk,
A. Merda,
Klaudia Klimaszewska,
Paweł Urbańczyk,
G. Golański
Publication year - 2020
Publication title -
biuletyn instytutu spawalnictwa w gliwicach/biuletyn instytutu spawalnictwa
Language(s) - English
Resource type - Journals
eISSN - 2300-1674
pISSN - 0867-583X
DOI - 10.17729/ebis.2020.6/7
Subject(s) - microstructure , welding , materials science , joint (building) , metallurgy , grain boundary , annealing (glass) , austenite , ultimate tensile strength , austenitic stainless steel , indentation hardness , tensile testing , precipitation , composite material , structural engineering , corrosion , physics , meteorology , engineering
The analysis involved a similar welded joint made of steel TP347HFG after operation at a temperature of 580°C. Tests revealed that the primary mechanisms responsible for the degradation of the microstructure in all areas of the joint subjected to analysis were precipitation processes within the grains and along the grain boundaries. The grain boundaries contained two morphologies forming a continuous lattice. Precipitation processes resulted in the high tensile strength of the joint and high hardness within the weld face area. After operation, the test joint was characterised by relatively high impact energy, which could be attributed to the fine-grained microstructure and the presence of numerous annealing twins.