POTENTIAL FOR IMPROVEMENTS IN MECHANICAL PROPERTIES OF AISI 9260 STEEL BY QUENCHING AND PARTITIONING HEAT TREATMENT

Lauro Correa Romeiro,Danilo Assad Ludewigs,Nestor Cezar Heck

doi:10.4322/2176-1523.20202080

Abstract

POTENTIAL FOR IMPROVEMENTS IN MECHANICAL PROPERTIES OF AISI 9260 STEEL BY QUENCHING AND PARTITIONING HEAT TREATMENT

Highlights

Quenching and partitioning (Q&P) heat treatment is receiving a growing attention as a potentially interesting route to promote improvements in the properties of the so-called third generation advanced high strength steel (AHSS) [1,2].The proposed heat treatment aims at stabilizing the retained austenite (RA) through carbon enrichment of austenite and simultaneous decarburization of the martensitic matrix [3] – carbide formation should be avoided as it may act as a carbon sink.Tecnol
Thereafter the material was quenched in salt bath to either 183 °C or 150 °C and held in the bath for 5 minutes followed by the partitioning step that was carried out at 280 or 400 °C (PT) in a molten salt bath (Durferrit AS 140) for both 60 or 1200 seconds, and water quenched to room temperature
Results from tensile tests with hot rolled AISI 9260 submitted to several Q&P cycles indicate that the best combination of strength and elongation (PSE = 42617 MPa.%) is achieved by quenching to 183 °C and partitioning at 400 °C/60 s; the high fraction volume of retained austenite (21.5%) must be taken into account when referring to this outstanding ductility

Summary

Introduction

Quenching and partitioning (Q&P) heat treatment is receiving a growing attention as a potentially interesting route to promote improvements in the properties of the so-called third generation advanced high strength steel (AHSS) [1,2].The proposed heat treatment aims at stabilizing the retained austenite (RA) through carbon enrichment of austenite and simultaneous decarburization of the martensitic matrix [3] – carbide formation should be avoided as it may act as a carbon sink.Tecnol. Miner., São Paulo, v. 17, n. 1, p. 3-12, jan./mar. 2020

Methods

Results

Conclusion