Effect of Cooling Time on Microstructure and Properties of 2507 Super Duplex Stainless Steel Welding Heat-Affect Zone
Year: 2018
Type: article
Abstract: The welding thermal simulation of 2507 Super Duplex Stainless Steel (SDSS) was investigated using Gleeble-3800 thermo-mechanical simulator. The morphology evolution of austenite and ferrite under different t8/5 and t12/8 were observed and compared. The impact tests and pitting corrosion tests under different t8/5 and t12/8 were conducted. The results showed that the austenite content increased and the austenitic morphology changed from allotriomorphic structure to strip or coarse-blocky structures with the increase of t8/5 and t12/8. The effect of t12/8 on the microstructure of welding Heat Affect Zone (HAZ) was more distinct than that of t8/5. The impact toughness of HAZ with the increase of t12/8 was improved due to higher austenite content, while that with the increase of t8/5 was slightly decreased due to the formation of intermediate phase, such as σ phase. The corrosion tests showed that the pitting resistance of HAZ was improved with the increase of t8/5 and t12/8, while the effect of t12/8 was especially evident.
Source: Materials science forum
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W2904466147