Development of ultrafine ferritic sheaves/plates in SAE 52100 steel for enhancement of strength by controlled thermomechanical processing

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• 作者：J. Chakraborty^a ; ^b ; I. Manna^a ; ^c ; ^{imanna@metal.iitkgp.ernet.in}
• 关键词：Thermomechanical processing ; Steel ; Bainite ; Martensite ; Nanoindentation ; Mechanical characterization
• 刊名：Materials Science and Engineering ; A
• 出版年：2012
• 期刊代码：61_09215093
• 类别：ms
• 出版时间：30 June, 2012
• 卷：548
• 期：Complete
• 页码：33-42
• 文件大小：2513 K

摘要

The present study attempts to tailor the size, morphology and distribution of the ferrite needles/sheaves by thermomechanical processing and develop an ultrafine ferrite + martensite duplex microstructure for enhancement of strength and toughness in SAE 52100 steel. The thermo-mechanical routine included 5%hot deformation before, during or after austenitizing at 950 掳C for 15 min followed by austempering at 270 掳C for 30 min and subsequent water quenching to room temperature. Optical/electron microscopy along with X-ray diffraction was used to quantitatively monitor the size, morphology and distribution of the phase or phase aggregate. Significant improvement in nanohardness, wear resistance and elastic modulus and was observed in samples subjected to thermomechanical processing, as compared to that following the same austenitizing and austempering routine without hot deformation at any stage. However, improvement in the bulk mechanical property due to the present thermo-mechanical is lower than that obtained in our earlier study comprising cold deformation prior to austenitizing and austempering.