Cracking of 7CrMoVTiB10-10 (T24) Steel Weld Joints

Michał Stopyra; Janusz Adamiec

doi:10.4028/www.scientific.net/SSP.226.87

Paper Titles

Tests of Welded Joints of New Generation Austenitic, Stainless Steel HR3C
p.65

Fatigue Behaviour of Carbide Precipitation Hardened Austenitic Steels
p.69

Influence of the Thermo-Mechanical Treatment on the Properties and Microstructure of High Manganese Austenitic-Ferritic Steel
p.75

Durability of Tube Bends Made of the 14MoV6-3 Steel under Low-Cycle Fatigue Conditions and Creep at a Temperature of 500°C
p.79

Cracking of 7CrMoVTiB10-10 (T24) Steel Weld Joints
p.87

The Influence of the Solutionizing and Ageing on the Structure and Hardness of the ZnAl40Cu3 Alloy
p.91

Evaluation of Susceptibility to Hot Cracking of Inconel 617 Nickel Alloy Welds in Transvarestraint Test
p.95

Microstructure and Mechanical Properties of High Manganese TWIP Steel after Thermo-Forming Processes
p.99

The Causes of Low Impact Strength of T23 Steel Weld Joints
p.103

HomeSolid State PhenomenaSolid State Phenomena Vol. 226Cracking of 7CrMoVTiB10-10 (T24) Steel Weld Joints

Cracking of 7CrMoVTiB10-10 (T24) Steel Weld Joints

Abstract:

7CrMoVTiB10-10 (T24) steel was designed for high temperature applications, especially for water wall panels in modern supercritical coal-fired boilers. However, welding of T24 steel caused many problems due to its cracking susceptibility. In the present paper the causes of T24 steel weld joints cracking have been discussed. Microstructural and fractographic analysis of weld joint were conducted and hardness was measured. It was found that the main causes of crack’s formation in weld metal are hot cracking susceptibility of T24, high deformation during welding process and weld metals’ hardenability. The mechanism of cracking was determined. It was concluded that cracks had been initiated in high temperature brittleness range, then propagated through the weld metal in transverse direction as the cold cracks. The reduction of weld metal’s ductility was due to too high cooling rate and excessive hardening of weld metal in relation to base metal.

You might also be interested in these eBooks

Technologies and Properties of Modern Utility Materials XXII

View Preview

Info:

Periodical:

Solid State Phenomena (Volume 226)

Pages:

87-90

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.226.87

Citation:

Cite this paper

Online since:

January 2015

Authors:

Michał Stopyra*, Janusz Adamiec

Keywords:

7CrMoVTiB10-10, T24, Weld Cracking, Weldability

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

* - Corresponding Author

References

[1] J. Arndt, The T23/T24 Book. New Grades for Waterwalls and Superheaters, Vallourec & Mannesman Tubes, second ed., (2000).

Google Scholar

[2] A. Ziewiec, K. Pańcikiewicz, E. Tasak, Cracking in the welds metal of 7CrMoVtiB10-10 (T24) steel during welding, commissioning and exploitation of power units (in Polish), Welding Technology Review 5 (2012) 2-6.

DOI: 10.26628/ps.v85i2.278

Google Scholar

[3] A. Ziewiec, S. Parzych, E. Tasak, Cold crack sensitivity of the bainitic steel for use at elevated temperatures (in Polish), Metallurgy and Metallurgical Engineering News 12 (2011) 978-981.

Google Scholar

[4] L. Mráz, P. Brziak, P. Bernasovský, P. Zifcák, Experience with Utility Properties of T24 Steel, Trends in Welding Research 2012, Proceedings of the 9th International Conference (ASM International) (2013) 1003-1010.

Google Scholar