Austenitic Grain Growth Behavior during Austenization in an Aluminum‐Alloyed 5% Cr–Mo–V Steel. Issue 11 (4th February 2016)

• Record Type: Journal Article
• Authors: Li, Sha‐Sha; Liu, Yao‐Hui; Song, Yu‐Lai; Kong, Ling‐Nan; Li, Tuan‐Jie; Zhang, Ren‐Hang
• Is Part Of: Steel research international. Volume 87:Issue 11(2016)
• Page Start: 1450
• Page End: 1460
• Publication Date: 2016-02-04
• Subjects: 5% Cr–Mo–V steel -- austenitic grain size -- grain size distribution -- grain growth; Steel -- Periodicals; Steel -- Metallurgy -- Periodicals; 669.142
• DOI: 10.1002/srin.201500427
• Languages: English
• ISSNs: 1611-3683

Abstract

Abstract : The influence of Al on the grain size, morphology, and grain size distribution of austenite is investigated in a wide range of austenitizing temperatures and holding times. In general, the addition of 1.1 wt% Al significantly increases the austenitic grain size at all the corresponding austenitizing conditions. The austenitic grain growth mode of the none Al‐added steel is abnormal grain growth at the austenitizing temperature in the range of 1100–1200 °C, while that of the high Al‐added steel has already become normal grain growth in the same temperature range. The results indicate that the Al addition can significantly accelerate the growth of austenite grains, mainly because the high content of Al affected the Zener drag and solute drag on the grain growth by reducing the activity and diffusivity of Mo and V atoms in austenite. In addition, the kinetic equations of austenite grain growth in both steels are proposed. The calculated grain growth exponents are n = 0.33 and n = 0.35, and the activation energies of grain growth are Q = 1.51 × 10 5 J mol −1 and Q = 1.85 × 10 5 J mol −1 for 0Al and 1.1Al, respectively. Abstract : The austenitic grain growth behavior of an aluminum‐alloyed 5% Cr–Mo–V steel has been investigated in a wide range of austenitizing temperatures and holding times. The results indicate that high content of Al addition can significantly accelerate the austenite grain growth, mainly because the high content of Al affected the Zener drag and solute drag on the grain growth.