Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Medium manganese steel with heterogeneous lamellar structure and preparation method thereof

A lamellar structure and heterogeneous technology, applied in the field of medium manganese steel materials, can solve problems such as product bending deformation, lower industrial production conditions, and low heating rate

Active Publication Date: 2022-04-15
BEIJING INSTITUTE OF TECHNOLOGYGY
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to propose a method for preparing medium manganese steel that is heat-treated by two-stage heating. In this heat treatment mode, a low heating rate can be used to obtain Alternately composed heterogeneous lamellar structure medium manganese steel, which can significantly reduce industrial production conditions, and at the same time solve the technical problem that the existing technology easily leads to product bending deformation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Medium manganese steel with heterogeneous lamellar structure and preparation method thereof
  • Medium manganese steel with heterogeneous lamellar structure and preparation method thereof
  • Medium manganese steel with heterogeneous lamellar structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0048] According to the technical scheme of the present invention, the preparation method of manganese steel in some specific heterogeneous lamellar structures comprises the following steps:

[0049] (1) after forging an ingot comprising iron, carbon and manganese, heat it at 1100-1300° C. for 24-36 hours to perform homogenization treatment, and hot-roll the forging obtained after the homogenization treatment to obtain a hot-rolled steel plate;

[0050] (2) Heat the obtained hot-rolled steel plate to the austenite single-phase region of 800-900°C for austenitization treatment, keep it warm for 10-60 minutes, and then cool it to the two-phase region of ferrite and cementite for heat preservation , to obtain pearlite structure, and continue to cool to room temperature;

[0051] (3) Rapidly austenitize the hot-rolled steel plate after pearlite transformation through a two-stage heat treatment. The two-stage heat treatment includes: first slowly heating the hot-rolled steel plate af...

Embodiment 1

[0060] The specific composition is Fe-0.39C-3.69Mn (wt.%) steel through vacuum melting and forging to form 250*250*40mm 3 Forging; take 100×40×26mm from the center of the forging 3 The square forgings are heated to 1250°C in an argon atmosphere, and held for 24 hours for homogenization; the homogenized forgings undergo 5 to 8 rolling passes to obtain hot-rolled plates with a thickness of 6mm, and the final rolling temperature is greater than 850°C. After rolling, air-cool to room temperature to form a martensitic matrix structure.

[0061] The steel plate after hot rolling is carried out as follows: figure 1 The shown two-stage heat treatment, the specific treatment steps are as follows:

[0062] (1) The hot-rolled steel plate was kept in a muffle furnace at 800°C for 10 minutes for austenitization, then moved to a salt bath furnace at 570°C and kept for 6 hours for complete pearlite transformation, and then water quenched to room temperature;

[0063] (2) After the pearlit...

Embodiment 2

[0069] The specific composition is Fe-0.39C-3.69Mn (wt.%) steel through vacuum melting and forging to form 250*250*40mm 3 Forging; take 100×40×26mm from the center of the forging 3 The square forgings were heated to 1200°C in an argon atmosphere, and held for 36 hours for homogenization; the homogenized forgings were passed through 9 rolling passes to obtain hot-rolled plates with a thickness of 6mm, and the final rolling temperature was greater than 900°C. Air-cooled to room temperature to form a martensitic matrix structure.

[0070] The steel plate after hot rolling is carried out as follows: figure 1 Shown heat treatment, specific processing steps are as follows:

[0071] (1) Heat the hot-rolled steel plate in a muffle furnace at 850°C for 6 minutes for austenitization, then move it to a salt-bath furnace at 550°C and hold it for 12 hours, then water quench to room temperature to obtain pearlite with a higher degree of Mn partitioning ;

[0072] (2) After the pearlite ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
yield strengthaaaaaaaaaa
yield strengthaaaaaaaaaa
yield strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a heterogeneous sheet structure medium manganese steel and a preparation method thereof. The medium manganese steel has a heterogeneous sheet composed of overlapping Mn-rich residual austenite and Mn-poor martensite nanosheets structure, the preparation method of which includes: performing two-stage heat treatment on medium manganese steel with pearlite as the initial structure, wherein the first stage of heat treatment is raised to a preheating temperature lower than the austenite formation temperature at a heating rate of less than 30°C / s , and heat preservation for preheating; the second stage of heat treatment is from the preheating temperature to the austenite reverse transformation temperature at a rate of less than 30 ° C / s, and heat preservation for austenite reverse transformation; finally, tempering. The present invention can prepare medium manganese steel with the same microstructure and mechanical properties as the rapid heating process through the two-stage heating treatment at a relatively low heating rate, which significantly reduces the industrial production conditions, and is useful in the traditional industrial production. The large and thick steel plate with heterogeneous structure provides a new technical route.

Description

technical field [0001] The invention relates to the technical field of medium manganese steel materials. Background technique [0002] Advanced high-strength steels are widely used as structural materials in the automotive industry, among which medium manganese steel is one of the most promising third-generation high-strength steels. The typical microstructure of medium manganese steel is ferrite / martensite and retained austenite, which achieves the matching between strength and elongation through the transformation-induced plasticity of retained austenite, and the austenite reverse transformation process Austenite stabilizing elements (such as carbon (C) and manganese (Mn)) can be partitioned into austenite by annealing in the two-phase region, thereby improving the stability of austenite so that it can be retained at room temperature, However, in order to obtain sufficiently stable austenite, a higher annealing temperature or a longer annealing time is often required to e...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/14C22C38/22C22C38/24C22C38/26C22C38/28C22C38/34C22C38/38C21D1/18C21D6/00C21D8/02
CPCC22C38/02C22C38/38C22C38/34C22C38/24C22C38/04C22C38/26C22C38/28C22C38/22C22C38/12C22C38/14C21D1/18C21D6/002C21D6/005C21D6/008C21D8/0205C21D8/0221C21D8/0247C21D2211/001C21D2211/008
Inventor 熊志平杨德振张超程兴旺
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com