In-situ Observation of Effect of La on Grain Refinement in Simulated Coarse-grain Heat-affected Zone of High Strength Low Alloy Steel

doi:10.11901/1005.3093.2020.312

Chinese Journal of Materials Research

2021, Vol. 35

Issue (3): 231-240 DOI: 10.11901/1005.3093.2020.312

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In-situ Observation of Effect of La on Grain Refinement in Simulated Coarse-grain Heat-affected Zone of High Strength Low Alloy Steel

ZHOU Feng¹^,², CAO Yuxin³, WAN Xiangliang¹^,²^,³(

)

^1.School of Mechanical and Electrical Engineering, Foshan Polytechnic, Foshan 528237, China
^2.Band (Foshan) Metallic Composite Materials Co. , Ltd. , Foshan 528000, China
^3.Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China

Cite this article:

ZHOU Feng, CAO Yuxin, WAN Xiangliang. In-situ Observation of Effect of La on Grain Refinement in Simulated Coarse-grain Heat-affected Zone of High Strength Low Alloy Steel. Chinese Journal of Materials Research, 2021, 35(3): 231-240.

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Abstract

The processes of austenite growth and microstructure transformation in the simulated coarse-grain heat-affected zone (CGHAZ) for high strength low alloy steels without and with 0.016% La addition were in-situ observed by means of high temperature laser confocal scanning microscope. The grain refinement in CGHAZ of the steel with 0.016% La was also assessed by using optical- and electron-microscopy. The results show that the complex inclusions of Al-Mg-O, (Mn, Ca)S and TiN may transform to La₂O₂S in CGHAZ of the steel due to the addition of 0.016% La. La₂O₂S had lower mismatch with α-Fe, which can effectively promote the formation of acicular ferrites. Meanwhile, many finer dispersed (Ti, Nb)(C, N) precipitates formed in 0.016% La-containing steel can effectively pin the austenite grain boundary, inhibiting the grain growth. Thus, the grains in CGHAZ of 0.016% La-containing steel became finer.

Key words: metallic materials grain refinement in-situ observation La high strength low alloy steel coarse-grain heat-affected zone

Received: 27 July 2020

ZTFLH:

430-4099

Fund: Guangdong Natural Science Foundation(2019A1515011828);Department of Education of Guangdong Province Innovative Research Team in University(2019GKCXTD005)

About author: WAN Xiangliang, Tel: 15971457600, E-mail: wanxiangliang@wust.edu.cn

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.312 OR https://www.cjmr.org/EN/Y2021/V35/I3/231

Table 1 Chemical composition of steels with (#2) and without (#1) La treatment (mass fraction， %)

Fig.1 Schematic illustration of simulated thermal cycle of the CGHAZ

Fig.2 SEM micrographs and EDS mapping images of inclusions in #1 (a, b) and #2 (c, d) steels

Fig.3 Size distributions of inclusions in #1 and #2 steels

Table 2 size of inclusions and precipitates of the investigated steels.

Fig.4 TEM micrographs of the precipitates and corresponding EDS mapping images of the precipitates in #1 (a, b) and #2 (c, d) steels

Fig.5 Size distribution of the precipitates in investigated steels

Fig.6 Process of austenite grain growth in both steels

Fig.7 HTLCM micrographs during the simulated CGHAZ in #1 (a) and #2 (c) steels, and images (b, d) of primary austenite grains after image processing of (a, c) using Adobe Photoshop

Table 3 Prior austenite grain size and fraction of acicular ferrite of the investigated steels

Fig.8 formation of acicular ferrite in the simulated CGHAZ

Fig.9 Formation of bainite ferrite in the simulated CGHAZ

Fig.10 Optical micrographs in the simulated CGHAZ of #1 (a) and #2 (b) steels

Fig.11 Orientation maps of bcc phases in the simulated CGHAZ of #1 (a) and #2 (b) steels, statistical distribution (c) of grain angles between adjacent grains and crystallographic grain size (d) of simulated CGHAZ in investigated steels.

Table 4 Crystallographic grain size of the investigated steels

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