PSI - Issue 16

Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 16 (2019) 237–244

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers. © 2019 The Author(s). Published by Elsevier B.V. Peer- review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers Impact toughness of the bas etal and welds of the pipe ste l of the X70 str ngth class was investigated a d high values were define . It was particularly imp rtant that imp ct toughness of th weld at temperatures of - 40 °C and - 20 °C was identical t that of the bas material. For specimens W1 and W2 cut from the heat zone of weld by different metods (milling (W1) an plasma method (W2)) at a tempe tur of - 40 °C, it was 1.14 and 1.5 times lower than that of the base metal, respectively. The method of cutting the specimens (milling, or plasma cutting) did not affect the impact toughness of the pipe steel and its welds in the investigated tempe ature range. © 2019 The Author(s). Published by Elsevier B.V. Peer- review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers Impact toughness of the base metal and welds of the pipe steel of the X70 strength class was investigated and high values were defined. It was particularly important that impact toughness of the weld at temperatures of - 40 °C and - 20 °C was identical to that of the base material. For specimens W1 and W2 cut from the heat zone of weld by different metods (milling (W1) and plasma method (W2)) at a temperature of - 40 °C, it was 1.14 and 1.5 times lower than that of the base metal, respectively. The method of cutting the specimens (milling, or plasma cutting) did not affect the impact toughness of the pipe steel and its welds in the investigated temperature range. Keywords: impact toughness, welds, milling, plasma cutting, pipe steel, temperature, fracture, failure analysis. 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” Influence of test temperature on impact toughness of X70 pipe steel welds Yevstakhiy Kryzhanivskyy a , Liubomyr Poberezhny a , Pavlo Maruschak b * , Mykhailo Lyakh a , Volodymyr Slobodyan a , Vasyl Zapukhliak a 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” Influence of test temperatur on impact toughness of X70 pipe steel welds Yevstakhiy Kryzhanivskyy a , Liubomyr Poberezhny a , Pavlo Maruschak b * , Mykhailo Lyakh a , Volodymyr Slobodyan a , Vasyl Z pukhliak a a Ivano-Frankivsk National Technical University of Oil and Gas, 15 Karpatska St., Ivano-Frankivsk, 76000, Ukraine b Ternopil Ivan Pul’uj National Technical University, 56 Ruska St., Ternopil, 46001, Ukraine a Ivano-Frankivsk National Technical University of Oil and Gas, 15 Karpatska St., Ivano-Frankivsk, 76000, Ukraine b Ternopil Ivan Pul’uj National Technical University, 56 Ruska St., Ternopil, 46001, Ukraine Abstract Abstract

Keywords: impact toughness, welds, milling, plasma cutting, pipe steel, temperature, fracture, failure analysis.

* Corresponding author. Tel.: +38-097-407-2696. E-mail address: maruschak.tu.edu@gmail.com * Corresponding author. Tel.: +38-097-407-2696. E-mail address: marusc ak.tu.ed @gmail.com

2452-3216 © 2019 The Author(s). Published by Elsevier B.V. Peer- review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers 2452-3216 © 2019 The Author(s). Published by Elsevier B.V. Peer- review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers. 10.1016/j.prostr.2019.07.047