In:
Journal of Materials Engineering and Performance, Springer Science and Business Media LLC, Vol. 32, No. 11 ( 2023-06), p. 5186-5200
Abstract:
Multiphase ultra-high strength steels (UHSS) containing retained austenite (RA) appear to be among the most interesting steels for the automotive industry. Developments in the last decades have allowed obtaining a very good combination of mechanical strength and ductility. Quenching and partitioning (Q & P) steels have been proposed as third-generation UHSS, reaching ultimate tensile strength up to 1300 MPa along with excellent fracture elongations of more than 15%. However, the use of Q & P steels is mainly limited by their susceptibility to hydrogen embrittlement (HE). The present work investigates the influence of the Q & P heat treatment parameters on the mechanical properties and on the HE resistivity of 20Mn-Si wire rod steel. The HE resistivity was measured using incremental step load testing with in situ electrochemical hydrogen charging according to ASTM F1624-12 standard. A comprehensive microstructure characterization was performed to examine volume fraction, nucleation sites and morphologies of RA. Although the mechanical properties were similar after Q & P heat treatment, an increase in the partitioning time revealed a significant increase in the HE threshold stress of more than 200 MPa.
Type of Medium:
Online Resource
ISSN:
1059-9495
,
1544-1024
DOI:
10.1007/s11665-022-07438-4
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2023
detail.hit.zdb_id:
2048384-3
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