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Bainitic Cold strengthen non- quenched and tempered steel microstructure and mechanical properties of

Author: JiFangFang
Tutor: WuYongSheng；HuiWeiJun
School: Kunming University of Science and Technology
Course: Materials Processing Engineering
Keywords: Cold strengthen the non- quenched and tempered steel TMCP Granular bainite Mn content C content
CLC: TG142.1
Type: Master's thesis
Year: 2010
Downloads: 109
Quote: 0
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Abstract


Energy in the national economy has an important strategic position in particular, the 1970s oil crisis prompted the birth of non-quenched and tempered steel. Fasteners are an important and large wide universal basic parts, the use of cold to strengthen non-quenched and tempered steel bolt can save quenched and annealed ball before drawing the two road long cycle, energy consumption of the heat treatment process, energy-saving effect is very significant. For the energy and resources of growing tension, cold non-quenched and tempered steel to strengthen development and application of a far-reaching social significance and significant economic benefits. In this paper, thermal simulation, metallography, scanning electron microscopy, transmission electron microscopy and other experimental methods, the new low-carbon Mn-Ti-B system to strengthen non-quenched and tempered steel Cold studied heating temperature, deformation temperature, deformation, cooling rate and other process parameters and different C content and Mn content on the microstructure and mechanical properties of transition effects. Thermal simulation results show that control the heating temperature at a suitable temperature (eg 1150 ℃ or so), can guarantee the alloying elements particularly appropriate micro-alloying elements dissolved in austenite grains and avoid excessive growth; With deformation temperature drops, the tissue gradually thinning, especially when the deformation temperature is reduced to 750 ℃, the availability of a very fine and homogeneous granular bainite; with the increase of the deformation, and more uniform microstructure refinement; cooling rate of the test steel structure and hardness greater impact, when the cooling rate at 2-4 ℃ / s or so, the availability of relatively small uniform granular bainite. 10% to 50% reduction rate γ within the drawing and aging treatment, the carbon content on the microstructure and mechanical properties of study results show that: when the carbon content is low (0.09-0.12% C), it can obtain relatively small uniform granular bainite, but when the carbon content is too high as 0.14%, then the organization appears massive ferrite. Γ in the same, with the increase of carbon content, test steel strength after drawing, plasticity reduced accordingly, when γ is large, the difference is obvious. Pullout test the strength of steel after aging increment increasing carbon content and significantly reduced. Mn content of the two low-carbon Mn-B-Ti system Cold strengthen non-quenched and tempered steel microstructure and mechanical performance characteristics of the study results show that when the Mn content is low (B8 material, 1.60% Mn), its microscopic organizations granular bainite ferrite pearlite mixed structure; and when the Mn content is high (B6 material, 2.02% Mn) obtained when the whole carbon granular bainite. Two kinds of organizational characteristics of test steel microstructure and tensile properties of drawing reduction rate γ with the variation of basically the same, but B6 material B8 yield ratio was significantly lower than expected. Aging treatment at 300 ℃, B6 material strength can reach 10.9 bolts requirements, and B8 materials meet only the requirements of 9.8 bolts. This indicates that the Mn content in the control of steel for strength and plasticity with better low-carbon granular bainite is 10.9 bolts with non-quenched and tempered steel cold strengthen the basic requirements.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Steel > Microstructure and properties of steel
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