The Failiur Analysis of Nb-Microalloyed δ-TRIP Steel

Gholami Shiri, S.; Palizdar, Y.; Jenabali Jahromi, A.; de Monlevade, F.

doi:10.22068/ijmse.15.3.32

Volume 15, Issue 3 (September 2018) IJMSE 2018, 15(3): 32-42 | Back to browse issues page

‎ 10.22068/ijmse.15.3.32

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Gholami Shiri S, Palizdar Y, Jenabali Jahromi A, de Monlevade F. The Failiur Analysis of Nb-Microalloyed δ-TRIP Steel. IJMSE 2018; 15 (3) :32-42
URL: http://ijmse.iust.ac.ir/article-1-1092-en.html

The Failiur Analysis of Nb-Microalloyed δ-TRIP Steel

S. Gholami Shiri

, Y. Palizdar

, A. Jenabali Jahromi

, F. De Monlevade

Abstract: (18226 Views)

The relation between microstructure and the fracture mechanisms of δ-TRIP steel with different Nb-content has been investigated using complementary methods of light microscopy, SEM, EDS, EBSD, X-ray phase analysis and tensile test. The results revealed a close dependency between the presences of constitutive phases i.e. ferrite, bainite, retained austenite and martensite and the mode and characteristics of fracture. All samples revealed almost different fractography pattern which could be associated to the effect of Nb microalloying element. The different fractography patterns were consisted of dimple rupture, riverside and Wallner lines pattern. The proportion of the cleavage fracture in comparison of dimple rapture increased by increasing the Nb-content due to the increase of primary martensite in the microstructure.

Keywords: δ-TRIP steel, High Al steel, Fracture mode, Fractography, Nb-microalloyed