Properties and service performance : Application of FeE460, a comparative investigation towards normalized, quenched and tempered, and thermomechanically treated steel types
report
In this summary, the items that have been investigated and the main results of the research contract 7210/KA/607-F1.3/88, 'Application of FeE460, a comparative investigation towards normalized, quenched and tempered, and thermomechanically treated steel types' are described. The steels mentioned before have been investigated (in plate thicknesses 15 and 50 mm) on the items:
a) mechanical properties and microstructure after a weld thermal simulation;
b) cold cracking susceptibility;
c) mechanical properties of test welds;
d) mechanical properties after deformation at different temperatures;
e) calculation of the price-effect of application of FeE460 instead of FeE355.
The results of the weld thermal simulation programme established that acceptable hardness values and good Charpy-V notch toughness properties can be obtained with all three steels. PWHT at temperatures of
560° or 590° C reduced the fracture energies of the QT material, and deteriorated the properties of the N and TM material. An acceptable PWHT temperature is 530° C. At high PWHT temperatures, all materials fractured intergranulaly (at low test temperatures). This has been associated with segregation of P to former austenite grain boundaries. At higher test temperatures the presence of V carbonitrides further reduces the Charpy-V fracture energy for the materials TM and N.
a) mechanical properties and microstructure after a weld thermal simulation;
b) cold cracking susceptibility;
c) mechanical properties of test welds;
d) mechanical properties after deformation at different temperatures;
e) calculation of the price-effect of application of FeE460 instead of FeE355.
The results of the weld thermal simulation programme established that acceptable hardness values and good Charpy-V notch toughness properties can be obtained with all three steels. PWHT at temperatures of
560° or 590° C reduced the fracture energies of the QT material, and deteriorated the properties of the N and TM material. An acceptable PWHT temperature is 530° C. At high PWHT temperatures, all materials fractured intergranulaly (at low test temperatures). This has been associated with segregation of P to former austenite grain boundaries. At higher test temperatures the presence of V carbonitrides further reduces the Charpy-V fracture energy for the materials TM and N.
TNO Identifier
482128
ISSN
1018-5593
ISBN
92-827-7200-4
Publisher
Office for Official Publications of the European Communities
Collation
XIV, 220 p.
Place of publication
Luxemburg