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

Q-and-PB (quenching and partitioning in bainite zone) heat treatment process for preparing 30 GPa%-grade complex-phase steel

A complex phase steel and process technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problems of high production cost, not higher than 20%, and limit the wide application of second-generation automotive steel, and achieve improved performance. The effect of elongation

Inactive Publication Date: 2013-06-19
UNIV OF SCI & TECH BEIJING
View PDF6 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first generation of high-strength steel for automobiles is mainly DP steel, TRIP steel, martensitic steel, etc., the structure is mainly ferrite and martensite, and the strength can reach 1000MPa, but the elongation is generally not higher than 20%. The plastic product is below 20GPa%; the second-generation automotive steel represented by austenitic steel and TWIP steel has an ultra-high elongation of 50-90% and a tensile strength of about 1000MPa, and the strong plastic product is about 60GPa% , the structure is mainly austenite, but a large amount of Cr, Ni, Mn and other elements are added to the second-generation automotive steel, and the high production cost limits the wide application of the second-generation automotive steel; therefore, it has martensite and austenite duplex structure, and the development of economical third-generation automotive steel with a strong-plastic product in the range of 30-40GPa% has important practical significance

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
  • Q-and-PB (quenching and partitioning in bainite zone) heat treatment process for preparing 30 GPa%-grade complex-phase steel
  • Q-and-PB (quenching and partitioning in bainite zone) heat treatment process for preparing 30 GPa%-grade complex-phase steel
  • Q-and-PB (quenching and partitioning in bainite zone) heat treatment process for preparing 30 GPa%-grade complex-phase steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The mass fraction of each component of the cold hard plate: C: 0.23%, Si: 1.53%, Mn: 2.07%, P: 0.010%, Al: 0.03%, S: 0.004%, the rest is Fe and unavoidable impurities, according to experience According to the formula, the starting temperature of martensite transformation and the optimum quenching temperature are 368°C and 230°C, respectively. The Q&PB heat treatment process is as follows: heat the sample to 850°C for 1-2min, quench to 270°C for 5s, according to the relationship between the quenching temperature and the amount of martensite V m =1-exp[-0.011(M s -T q )] The calculated martensite content obtained by the quenching temperature is 66%, and the austenite content is 34%. Then the temperature was raised to 400°C for 60s and 120s, and finally quenched to room temperature. The obtained room temperature structure included martensite, retained austenite and bainite, as shown in Figure 1. The test results of mechanical properties are that the yield strength, tens...

Embodiment 2

[0020] The mass fraction of each component of chilled hard board: C: 0.26%, Si: 1.61%, Mn: 2.1%, P: 0.013%, Al: 0.03%, S: 0.006%, Mo: 0.21%, Nb: 0.059%, and the rest It is Fe and unavoidable impurities. According to the empirical formula, the martensitic transformation temperature and the optimal quenching temperature are 354°C and 234°C, respectively. The Q&PB heat treatment process is as follows: heat the sample to 850°C for 1-2min, quench to 270°C for 5s, according to the relationship between the quenching temperature and the amount of martensite V m =1-exp[-0.011(M s -T q )] Calculate the martensite content obtained by the quenching temperature to be 60.3%, and the austenite content to be 39.7%. Then the temperature was raised to 400°C for 420s and 600s, and finally quenched to room temperature. The obtained room temperature structure included martensite, retained austenite and bainite, as shown in Figure 1. The test results of mechanical properties are that the yield s...

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
Strong plastic productaaaaaaaaaa
Strong plastic productaaaaaaaaaa
Elongationaaaaaaaaaa
Login to View More

Abstract

The invention discloses a Q-and-PB (quenching and partitioning in bainite zone) heat treatment process for preparing 30 GPa%-grade complex-phase steel, and belongs to the field of metal heat treatment. In the method, a chill plate made from low-carbon silicon-manganese-series ingredient steel is used as a raw material. The Q-and-PB heat treatment method comprises the following steps of: firstly, heating the steel plate to a temperature of greater than Ac3 and insulating heat for 2 minutes, and quenching to a temperature T1 which is between Ms and Mf; secondly, placing a test sample in a place at a temperature T2 which is greater than the temperature Ms and insulating heat for 30-600 seconds; and finally, quenching to a room temperature. Experiments prove that the low-carbon silicon-manganese-series steel prepared by the method disclosed by the invention is extremely high in strength and elongation, and the product of strength and elongation of the low-carbon silicon-manganese-series steel achieves more than 30 GPa%.

Description

[0001] The invention belongs to the field of heat treatment of metal materials, and is an economical heat treatment process for 30GPa·% ultra-high-strength multi-phase steel. Background technique [0002] As people's awareness of automobile safety and environmental protection increases, the development of "environmentally friendly automobiles" is the development trend of the automobile industry. In order to simultaneously improve safety performance and save energy and reduce emissions, it is necessary to increase the proportion of ultra-high-strength automotive steel used in the body. Studies have shown that by using ultra-high-strength automotive steel to reduce the weight of the car body by 10%, fuel consumption can be saved by 3% to 7%. The first generation of high-strength steel for automobiles is mainly DP steel, TRIP steel, martensitic steel, etc., the structure is mainly ferrite and martensite, and the strength can reach 1000MPa, but the elongation is generally not high...

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
IPC IPC(8): C21D11/00C21D8/02
Inventor 康永林朱帅邝霜姜英花朱国森
Owner UNIV OF SCI & TECH BEIJING
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