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Research and Development of the Third Generation Steels for Automobile with Ultra-High Strength and Product of Strength and Elongation Based on Strength and Plasticity Enhancement by Multi-Dimensions Mechanisms(PDF)

MATERIALS CHINA[ISSN:1674-3962/CN:61-1473/TG]

Issue:
2018年第10期
Page:
56-60
Research Field:
特约研究论文
Publishing date:

Info

Title:
Research and Development of the Third Generation Steels for Automobile with Ultra-High Strength and Product of Strength and Elongation Based on Strength and Plasticity Enhancement by Multi-Dimensions Mechanisms
Author(s):
ZHU Guohui1 DING Hanlin2 WANG Xiaonan2 WANG Yongqiang3 CHEN Qiwei1
(1.School of Metallurgy Engineering, Anhui University of Technology, Maanshan 243032, China)(2.School of Iron and Steel, Soochow University, Suzhou 215021,China)(3.School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243032,China)
Keywords:
the third generation automobile steels multi-dimension mechanism ultra-high strength high product of strength and elongation second phase particles microalloying
CLC:

PACS:
-
DOI:
10.7502/j.issn.1674-3962.2018.10.10
DocumentCode:

Abstract:

The research and development of the third generation automobile steels were summarized and analyzed in this paper. The mechanism for enhancement of elongation at ultrahigh level of strength mainly was increasing the volume fraction of retained austenite (RA) in the current researches. However, it is very difficult to be applicable in the industries to achieve the high product of strength and elongation only by the mechanism of RA, resulting in that the third generation automobile steels have not been practically manufactured and applied widely during the past decade. In order to increase the elongation under the condition of ultrahigh strength, it is required to combine all of possible mechanisms for plasticity enhancement other than only by RA mechanism, in which the development of new alloying system and new technical route is necessary. Based on the theoretical analysis and primary results, a novel technical route called as “Multidimension Mechanism” was proposed, in which the strength and elongation would be increased simultaneously by the combined effect of Precipitation, Refine of microstructure and Multiphase design (PRM). The primary experimental results were analyzed by taking the newly designed CrMn microalloyed steel as an example. The results illustrated that enhancement of elongation at the ultrahigh strength level could be industrially achieved with lowcost, low energy consumption and easily popularizing for the manufacturing and application in the third generation automobile steels based on present cold rollingannealing processing through new alloy designs and technical routes. Novel ideas have been proposed in the paper, which will be helpful to resolve the key problem of elongation enhancement in the ultrahigh strength steels including the third generation automobile steels.

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Last Update: 2018-11-12