Method for manufacturing high-plastic ultra-fine grain micro-alloy low-carbon steel
A manufacturing method and ultra-fine grain technology, applied in metal rolling and other directions, can solve the problems of restricting the processing and practical application of ultra-fine grain steel, and achieve the effects of excellent comprehensive mechanical properties, improved plasticity and high elongation.
Inactive Publication Date: 2008-07-23
YANSHAN UNIV
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Problems solved by technology
This greatly limits the processing and practical application of ultrafine-grained steel
Method used
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[0012] Embodiment: A 14mm thick 14MnNb hot-rolled steel plate is cut into a plate shape with a size of 120×30mm by a shearing machine, and the longitudinal direction is along the rolling direction. Use wire cutting to cut at 1 / 2 thickness along the direction parallel to the plate surface to obtain two plate-shaped samples of 120×30×7mm. Heat the two plates to 950°C for 30 minutes in a resistance furnace, quench the first sample directly in 10% brine, and cool the second sample to 830°C with the furnace for 30 minutes, then quench in 10% brine. Then use a grinder to grind the two quenched samples to a thickness of 5mm, and then perform multi-pass cold rolling with a total reduction of 70%, and then anneal at 580°C for 120min. After processing, tissue observation and stretching experiments were performed. The microstructure of the section perpendicular to the rolling direction was observed with a transmission electron microscope, and the grain size distribution was measured and...
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Abstract
The invention discloses a manufacturing method of high plastic ultra-fine grain microalloy low carbon steel, which is characterized in that: a. the 14MnNb steel hot-rolled plate is heated to 950 to 1020 degrees and keeps a constant temperature in the range of 950 to 1020 DEG C for 30 to 40 minutes; b. the hot-rolled plate is cooled to 840 to 800 degrees C as furnace cooling and keeps a constant temperature in the range of 840 to 800 degrees C for 30 to 40 minutes and then is put into 10 percent brine to quench; c. total reduction amount 60 to 80 percent multi-pass ambient temperature rolling deformation is carried out; d. the temperature is kept at 500 to 600 degrees C for 1 to 20 hours, and then the plate is air cooled, recrystallized and annealed. The manufacturing method of high plastic ultra-fine grain microalloy low carbon steel, has the advantages that: the high plastic ultra-fine grain microalloy low carbon steel prepared has high strength and larger elongation of 11.3 percent, and the tensile strength is 615MPa, compared with the ultra-fine grain obtained by deformation, recrystallization and annealing of pure martensite, the elongation and the tensile strength is respectively increased for 85 percent and 23 percent. The manufacturing method is suitable for producing high plastic ultra-fine grain microalloy low carbon steel plate or strip steel rolled stock.
Description
technical field [0001] The invention relates to a method for manufacturing ultrafine-grained low-carbon steel, in particular to a method for manufacturing ultrafine-grained microalloyed low-carbon steel with high plasticity. Background technique [0002] Ultrafine-grained steel has extremely high tensile strength, and has received extensive attention in the field of materials science in recent years. Material scientists have conducted a lot of in-depth research in the fields of preparation methods, microstructure and performance characteristics of ultra-fine grain steel. It has been reported that ultra-fine-grained low-carbon steel (Scr. Mater. 2002, Vol.47, p.893) and nano-crystalline low-carbon steel (Mater. Sci.Eng.A, 2006, Vol.432, p.216). Studies have shown that as the grain size decreases, the work hardening ability and tensile elongation decrease, and plastic instability occurs (Mater.Sci.Eng.A, 2000, Vol.293, p.165; Scr.Mater 2002, Vol.47, p.893; Acta Mater.2005, ...
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IPC IPC(8): C21D1/78B21B1/36C21D8/00
Inventor 王天生杨静张福成
Owner YANSHAN UNIV