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ISSN : 1225-0562(Print)
ISSN : 2287-7258(Online)
Korean Journal of Materials Research Vol.19 No.6 pp.305-312
DOI : https://doi.org/10.3740/MRSK.2009.19.6.305

Effects of Stability and Volume Fraction of Retained Austenite on the Tensile Properties for Q&P and AM Steels

Byun, Sang-Ho, Oh, Chang-Suk, Nam, Dae-Geun, Kim, Young-Seok, Kang, Nam-Hyun, Cho, Kyung-Mox

Abstract

The effects of Quenching and Partitioning (Q&P) and Annealed Martensite (AM) heat treatment on the microstructure and tensile properties were investigated for 0.24C-0.5Si-1.5Mn-1Al steels. The Q&P steels were annealed at a single phase (γ) or a dual phase (γ+α), followed by quenching to a temperature between Ms and Mf. Then, enriching carbon was conducted to stabilize the austenite through the partitioning, followed by water quenching. The AM steels were intercritically annealed at a dual phase (γ+α) temperature and austempered at Ms and Ms±50˚C, followed by cooling in oil quenching. The dual phase Q&P steels showed lower tensile strength and yieldyield strength than those of the single phase Q&P steels, and tThe elongation for the dual phase Q&P steel was partitioning 100s higher than that of that for the single phase Q&P steels as the partitioning time was less than 100s up to partitioning 100s. For AM steels, the tensile/yield strength decreased and the total elongation increased as the austempering temperature increased. The stability of the retained austenite controlled the elongation for Q&P steels and the volume fraction of the retained austenite controlled the elongation for AM steels.

Q&P와 AM강의 잔류오스테나이트 분율과 안정도에 따른 인장특성 거동

변상호, 오창석, 남대근, 김영석, 강남현, 조경목

초록