A kind of low temperature high strain rate superplastic medium manganese steel and preparation method thereof

Abstract

The invention discloses a low temperature high strain rate superplastic medium manganese steel and a preparation method thereof. The chemical composition of the medium manganese steel is calculated as: C: 0.05-0.15%; Mn: 5-8%; Al: 0-8%. 3%; Nb: 0.05-0.15%; V: 0.05-0.1%, the rest is Fe and unavoidable impurities; the medium manganese steel has a duplex austenite and ferrite microstructure, and the microstructure is uniform Equiaxed austenite and ferrite grains, the austenite and ferrite grain sizes are all below 0.3um. The preparation method of medium manganese steel is as follows: 1) smelting a steel ingot with a ratio of components, 2) heating forging, 3) low temperature hot rolling, 4) cyclic quenching heat treatment, 5) large reduction rate cold rolling, 6) critical heat treatment, and finally Obtain ultra-fine (average grain size less than 0.3 μm) austenite and ferrite dual-phase medium manganese steel plate.

Description

A kind of low temperature high strain rate superplastic medium manganese steel and preparation method thereof technical field The present invention relates to high-strength steel technical field, be specifically related to a kind of low temperature high strain rate superplastic medium manganese steel and its manufacture preparation method. Background technique In recent years, the rapidly developing automobile industry has brought a series of problems such as environmental pollution and energy shortage, environmental protection, Energy saving and safety have become the development themes of the automobile manufacturing industry. Among the many measures to save fuel consumption and reduce exhaust emissions, automobiles The effect of light weight is the most obvious. There are two main ways to reduce the weight of automobiles: one is to use lightweight materials, such as aluminum alloy, magnesium Alloys, engineering plastics and composite materials; the second is to ...

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Problems solved by technology

[0006] However, the existing superplastic deformation conditions of medium manganese steel have two disadvantages: (1) the forming temperature is relatively high, often above 800°C; (2) the forming speed is low, and the strain rate is often 10 -3 Below / s

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