2010
DOI: 10.1007/s11661-010-0590-y
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Effects of Rolling and Cooling Conditions on Microstructure and Tensile and Charpy Impact Properties of Ultra-Low-Carbon High-Strength Bainitic Steels

Abstract: Six ultra-low-carbon high-strength bainitic steel plates were fabricated by controlling rolling and cooling conditions, and effects of bainitic microstructure on tensile and Charpy impact properties were investigated. The microstructural evolution was more critically affected by start cooling temperature and cooling rate than by finish rolling temperature. Bainitic microstructures such as granular bainites (GBs) and bainitic ferrites (BFs) were well developed as the start cooling temperature decreased or the c… Show more

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Cited by 25 publications
(6 citation statements)
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“…A faster cooling rate leads to greater undercooling and stronger driving force of phase transformation; hence, phase transformation is easier at low temperatures. Sung et al [21] proposed that the different microstructural characteristics of bainite may be attributed to differences in phase transformation temperatures. The present study also investigated the bainite transformation kinetics of the 23CrNi3Mo steel matrix by exploring the mechanism of nucleation and growth mode of bainite under different cooling rates.…”
Section: Kinetics Of Matrix Bainite Transformationmentioning
confidence: 99%
“…A faster cooling rate leads to greater undercooling and stronger driving force of phase transformation; hence, phase transformation is easier at low temperatures. Sung et al [21] proposed that the different microstructural characteristics of bainite may be attributed to differences in phase transformation temperatures. The present study also investigated the bainite transformation kinetics of the 23CrNi3Mo steel matrix by exploring the mechanism of nucleation and growth mode of bainite under different cooling rates.…”
Section: Kinetics Of Matrix Bainite Transformationmentioning
confidence: 99%
“…As shown in Figure 5, all specimens show continuous yielding behaviour. The literature [37][38][39] reports that mobile dislocations formed inside the LB are promoted by the hard phase of M/A constituents, leading to continuous yielding behaviour. The fraction of bainite laths is higher in the whole heating specimen than in the local heating specimen.…”
Section: Tensile Testing Resultsmentioning
confidence: 99%
“…Considering the role of bainite on ductility and impact toughness of bainitemartensite steels, several conflicting observations have been reported. In general, the presence of granular bainite or upper bainite imposes an adverse effect on the toughness of tempered martensitic steels due to the following reasons: (i) The coarse carbide particles or coarse islands of MA constituents act as cleavage crack initiation sites; (ii) The low-angle boundaries between adjacent bainite laths (or sub-units) are ineffective in retarding (or deviating) cleavage crack propagation; and (iii) Bainite is far less responsive to tempering (or coiling) treatment than martensite [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46]. Due to the finer carbide size as well as finer bainitic-ferrite plate, block, and packet sizes, the impact toughness of lower-bainite is superior to that of granular-and upper bainite [46].…”
Section: Introductionmentioning
confidence: 99%