INFLUENCE OF AUSTENITIZING TEMPERATURE ON THE MICROSTRUCTURE AND IMPACT TOUGHNESS OF A HIGH STRENGTH LOW ALLOY HSLA100 STEEL

doi:10.3724/SP.J.1037.2012.00305

Acta Metall Sin

2012, Vol. 48

Issue (11): 1290-1298 DOI: 10.3724/SP.J.1037.2012.00305

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INFLUENCE OF AUSTENITIZING TEMPERATURE ON THE MICROSTRUCTURE AND IMPACT TOUGHNESS OF A HIGH STRENGTH LOW ALLOY HSLA100 STEEL

YOU Yang, WANG Xuemin, SHANG Chengjia

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083

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YOU Yang WANG Xuemin SHANG Chengjia. INFLUENCE OF AUSTENITIZING TEMPERATURE ON THE MICROSTRUCTURE AND IMPACT TOUGHNESS OF A HIGH STRENGTH LOW ALLOY HSLA100 STEEL. Acta Metall Sin, 2012, 48(11): 1290-1298.

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Abstract

The effect of austenitizing temperature on the microstructures and -20 ℃ impact toughness of HSLA100 steel was investigated by Gleeble-3500 thermal simulator. Its microstructures were observed by SEM and EBSD, and the relevant transformation kinetics was also analyzed by means of dilatometer. The results show that the microstructure of HSLA100 steel changes gradually from granular to lath bainite with increasing austenitizing temperature. The highest impact toughness of samples was achieved at austenitizing temperature of 1000 ℃, in which martensite-austenite (M/A) islands are finer and dispersed and the density of high angle boundaries is maximum. M/A islands, however, become coarser and this density lowers below 1000 ℃, beyond 1000 ℃, these islands are refined, being accompanied by a dramatic decrease of this density of high angle boundaries. Kinetics analysis indicates that with increasing austenitizing temperature, the transformation start temperature decreases but the transformation rate increases. Both lower start temperature and faster rate would facilitate M/A islands refining. All the transformation occurring in samples might be divided into two stages: bainite and martensite stages. The highest transformed fraction of bainite is achieved in the bainite stage at about 1000 ℃, resulting in the best impact toughness of HSLA100 steel. The crystallographic analysis of the well refined M/A islands at 1000 ℃ and 1300 ℃ shows that major high angle boundaries occur prior at the boundaries between different Bain groups belong to the same crystallographic group set to at austenite boundaries when covariance transformation occurring. When over-increasing austenitizing temperature, the covariance transformation products in coarser austenite grains are dominated by only one Bain group belong to the crystallographic group set, leading to the density of high angle boundaries and thus the impact toughness of HSLA100 steel decreasing.

Key words: HSLA100 steel austenite grain size phase transformation toughness crystallographic packet

Received: 25 May 2012

ZTFLH:

TG142

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Supported by National Basic Research Program of China (No. 2010CB630801) and High Technology Research and Development Program of China (No.2008AA03Z501)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00305 OR https://www.ams.org.cn/EN/Y2012/V48/I11/1290

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