Bake hardening behavior of transformation induced plasticity steel TRIP590

doi:10.13251/j.issn.0254-6051.2020.08.009

Abstract

Abstract: Influence of pre-strain and bake praess on the bake hardening(BH) behavior of TRIP590 steel was investigated by using tensile tester, SEM and TEM. The results indicate that the tested steel microstructure is composed of 75.5%ferrite+15.0%bainite+9.5%retained austenite (volume fraction). The BH value is increased with the increase of pre-strain, and the increase in the early stage is larger. The BH value is increased from 22 MPa to its maximum value 88 MPa when the strain is increased from 2% to 8%. The BH value shows a trend of increasing with the increase of both the bake time and the bake temperature. Variation of the BH value is consistent with that of internal friction, confirming the mechanism of Cottrell nailing. After 2% pre-strain+baking, the pinning phenomenon of dislocation by solution atoms can be found in the matrix.

Key words: TRIP590 steel, bake hardening, microstructure, dislocation pinning

CLC Number:

TG156.1

Wang Wenying, Wang Hui, Qu Shiyong. Bake hardening behavior of transformation induced plasticity steel TRIP590[J]. Heat Treatment of Metals, 2020, 45(8): 43-46.

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