Computational Model for Predicting Microstructures and Mechanical Properties in Manufacturing of Heavy Steel Plates

Yoshie, Atsuhiko; Fujioka, M.; Onoe, Yasumitsu; Nishioka, Kiyoshi

doi:10.1016/b978-0-444-88864-8.50172-2

Cited by 1 publication

(5 citation statements)

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“…In the present case, a soaking temperature of 1200°C was found to be optimum, because, in this temperature, austenite grain size was neither too big, nor too small. It was observed by earlier authors that high recrystallisation and rolling temperatures allow austenite to recrystallise to relatively coarse grains before direct quenching, which is not desirable 37. Again, lowering the soaking temperature too much will lead to the operational difficulties.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, from both grain size and operational point of view, 1200°C soaking temperature was found to be optimum. Interestingly, Yoshie et al and many earlier researchers had also selected this soaking temperature for processing of a similar kind of steel 10,11,27,37…”

Section: Resultsmentioning

confidence: 99%

“…It was observed by earlier authors that high recrystallisation and rolling temperatures allow austenite to recrystallise to relatively coarse grains before direct quenching, which is not desirable. 37 Again, lowering the soaking temperature too much will lead to the operational difficulties. Therefore, from both grain size and operational point of view, 1200uC soaking temperature was found to be optimum.…”

Section: Influence Of Reheating Temperature and Time On Austenite Gra...mentioning

confidence: 99%

“…Interestingly, Yoshie et al and many earlier researchers had also selected this soaking temperature for processing of a similar kind of steel. 10,11,27,37…”

Section: Influence Of Reheating Temperature and Time On Austenite Gra...mentioning

confidence: 99%

“…Few trial heats were made in this regard in the late 1980s and early 1990s, and since then, efforts have been directed to develop this strategic material for naval shipbuilding applications and also to obtain a critical understanding of its structure and property correlations. 27,[29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] The present study elucidates the usage of simulation techniques for developing a lean chemistry Cu bearing HSLA steel on laboratory scale with properties similar to HSLA-100 steel. The chemical composition of the steel investigated correspond to 0?07C-0?69Mn-0?41Si-0?89Cu-0?77Cr-0?97Ni-0?23Mo-0?028Nb-0?011S-0?007P (wt-%), which was significantly leaner than conventional HSLA-100 steel in terms of both Cu and Ni.…”

Section: Introductionmentioning

confidence: 99%

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Studies on influence of reheating temperature and cooling rate on structure–property behaviour of lean chemistry HSLA-100 steel

Dhua¹

2011

Materials Science and Technology

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Simulation studies on the influence of reheating temperature on austenite grain coarsening in lean chemistry high strength low alloy (HSLA)-100 steel were carried out to establish optimum soaking temperature before hot rolling. Experiments carried out in ‘Gleeble-3500’ dynamic thermomechanical simulator revealed that prior austenite grain sizes varied between 26 and 98 and 34 and 126 μm after soaking at 1150, 1200 and 1250°C for 1 and 5 min respectively; a soaking temperature of 1200°C was found to be optimum. Simulation experiments on the influence of cooling rate on microstructural changes and dilatometric studies indicated lowering of transformation temperature with faster cooling. Microstructural examination of dilatometric samples confirmed martensitic transformation at faster cooling rate. The martensite structure is desirable to achieve better strength and toughness. The findings of simulation studies were subsequently used for standardising thermomechanical treatments of Nb–Cu bearing lean chemistry HSLA-100 steels. One laboratory heat of Cu bearing HSLA steel containing 0·028%Nb was made. This heat was hot rolled into 12·5 mm thick plate by varying finish rolling temperature in the range of 800–1000°C. The soaking temperature was maintained at 1200°C. The rolled plates were heat treated by both conventional reheat quenching and tempering (RQT) as well as direct quenching and tempering (DQT) techniques. Evaluation of mechanical properties revealed that plates processed through DQT route were superior to those processed through RQT route. Transmission electron microscopy revealed that martensite structure and finer interlath spacing in DQT plates resulted in superior strength and impact toughness properties as compared to RQT steels.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Influence Of Reheating Temperature and Time On Austenite Gra...mentioning

confidence: 99%

“…Interestingly, Yoshie et al and many earlier researchers had also selected this soaking temperature for processing of a similar kind of steel. 10,11,27,37…”

Section: Influence Of Reheating Temperature and Time On Austenite Gra...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Studies on influence of reheating temperature and cooling rate on structure–property behaviour of lean chemistry HSLA-100 steel

Dhua¹

2011

Materials Science and Technology

View full text Add to dashboard Cite

show abstract

Computational Model for Predicting Microstructures and Mechanical Properties in Manufacturing of Heavy Steel Plates

Cited by 1 publication

References 6 publications

Studies on influence of reheating temperature and cooling rate on structure–property behaviour of lean chemistry HSLA-100 steel

Studies on influence of reheating temperature and cooling rate on structure–property behaviour of lean chemistry HSLA-100 steel

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