MICROSTRUCTURE AND TEXTURE WELDS OF 15-7Mo STEEL AFTER HEAT TREATMENT
DOI:
https://doi.org/10.7494/mafe.2016.42.4.225Keywords:
semi-austenitic PH steels, XRD, welds, heat treatment, 15-7Mo steelAbstract
This paper presents the results of determining the effect of heat treatment after welding X8CrNiMoAl15-7-2 steel (commercial name: PH 15-7Mo steel) on the microstructure and texture of the welds. XRD studies showed the presence of the two phases in the welds of 15-7Mo steel; i.e., δ ferrite and austenite. Annealing at a temperature of 400°C/1 h and 550°C/1 h results in changes of the intensities for individual peaks derived from austenite and ferrite. Microstructure investigations carried out by LM and TEM indicated that the austenite and δ ferrite coexist in themicrostructure of 15-7Mo steel in as-welded condition. Annealing at a temperature range of between 400–620°C after welding causes small changes in the microstructure. The hardness of the welds after annealing in that temperature range increases.Downloads
References
http://www.aksteel.com/pdf/markets_products/stainless/precipitation/15-7_Mo_Data_Sheet.pdf [16.09.2016]
Xu X.L., Yu Z.W.: Metallurgical analysis on a bending failed pump-shaft made of 17-7PH precipitation-hardening stainless steel. Journal of Materials Processing and Technology, 198, 1–3 (2008), 254–259
Fakić B., Ćubela D.: Review of the Development of Research in the Design of Semi Austenitic Stainless Steel 17-7PH. Journal of Trends in the Development of Machinery and Associated Technology, 17, 1 (2013), 57–60
Ziewiec A., Tasak E., Witkowska M., Ziewiec K.: Microstructure and properties of welds of semi-austenitic precipitation hardening stainless steel after heat treatment. Archives of Metallurgy and Materials, 58, 2 (2013), 613–617
Tenerowicz B.: Tekstura złącz spawanych stali nierdzewnych. Master thesis, AGH, Krakow 2012
Kou S.: Welding Metallurgy. Willey Interscience, Hoboken, NJ 2003
Tasak E., Ziewiec A.: Spawalność materiałów konstrukcyjnych. Tom I: Spawalność stali. Wydawnictwo JAK, Kraków 2009
Lippold J., Kotecki D.: Welding metallurgy and weldability of stainless steels. Wiley-Interscience. John Wiley & Sons, Inc., Hoboken, NJ 2005
Brooks A., Garrison W.M.: Weld Microstructure Development and Properties of Precipitation-Strengthened Martensitic Stainless Steels. Welding Journal, 8 (1999), 280–291