文章信息/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

作者:

朱國輝1; 丁漢林2; 王曉南2; 王永強3; 陳其偉1

（1.安徽工業(yè)大學冶金工程學院，安徽 馬鞍山 243032）（2.蘇州大學 沙鋼鋼鐵學院，江蘇 蘇州 215021）（3.安徽工業(yè)大學材料科學與工程學院，安徽 馬鞍山 243032）

Author(s):

ZHU Guohui1;  DING Hanlin2;  WANG Xiaonan2;  WANG Yongqiang3;  CHEN Qiwei1

(1.School of Metallurgy Engineering, Anhui University of Technology, Ma�餫nshan 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�餫nshan 243032,China)

關鍵詞:

第三代汽車用鋼; 多維度增強增塑; 超高強度; 高強塑積; 第二相粒子; 微合金化

Keywords:

the third generation automobile steels;  multi-dimension mechanism;  ultra-high strength;  high product of strength and elongation;  second phase particles;  microalloying

DOI:

10.7502/j.issn.1674-3962.2018.10.10

文獻標志碼:

A

摘要:

對近年來第三代超高強度高強塑積（抗拉強度1000 MPa以上，強塑積20~30 GPa%）汽車用鋼國內(nèi)外研究現(xiàn)狀進行了系統(tǒng)分析。分析表明，目前超高強度條件下的塑性增加的主要技術路線是依靠殘余奧氏體增塑。然而，多年的研究實踐證明僅依靠殘余奧氏體增塑的單一機制難以實現(xiàn)超高強度條件下的高強塑積的目標，導致超高強度汽車用鋼雖然經(jīng)過了近十年的發(fā)展，依然未能真正形成規(guī)�；�工業(yè)生產(chǎn)與應用。為實現(xiàn)超高強度條件下的塑性提升，必須從開發(fā)新的合金化體系和新的技術路線兩個方面入手，突破傳統(tǒng)的單一增塑機制�；�于理論分析和前期研究，作者團隊提出了“多維度增強增塑”機制，即利用第二相粒子（Precipitation）增強增塑和組織合理細化（Refinement）配合多相組織設計（Multiphase）的PRM機制，實現(xiàn)多種增強增塑機制共同作用的復合效應。并以微合金化Cr�睲n系合金體系為研究對象進行了分析討論。結(jié)果表明，立足于現(xiàn)有冷軋退火工藝裝備條件，通過新品種和新技術路線的開發(fā)，可以實現(xiàn)第三代汽車用鋼超高強度條件下的塑性增強，并且低成本、低能耗、可以大規(guī)模工業(yè)推廣和應用，為真正實現(xiàn)第三代汽車用鋼的工業(yè)生產(chǎn)和應用提供新的思路和方向，同時為解決鋼鐵材料超高強度條件下的塑性提升的共性問題提供科學依據(jù)。

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�瞙igh 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�瞙igh 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�瞕imension Mechanism” was proposed, in which the strength and elongation would be increased simultaneously by the combined effect of Precipitation, Refine of microstructure and Multi�瞤hase design (PRM). The primary experimental results were analyzed by taking the newly designed Cr�睲n microalloyed steel as an example. The results illustrated that enhancement of elongation at the ultra�瞙igh strength level could be industrially achieved with low�瞔ost, low energy consumption and easily popularizing for the manufacturing and application in the third generation automobile steels based on present cold rolling�瞐nnealing 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�瞙igh strength steels including the third generation automobile steels.