Transactions of Materials and Heat Treatment

Title：Applicability analysis on evaluation method of formability for advanced high-strength steel sheet

Authors： Lian Changwei Lin Jianping Niu Chao

Unit： Tongji University Baoshan Iron & Steel Co. Ltd. State Key Laboratory of Development and Application Technology of Automotive Steels (Baosteel)

KeyWords： advanced high-strength steel formability strain hardening index reaming rate forming limit diagram

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2021,46(11):231-237

Abstract：

The application of high-strength steel and ultra-high-strength steel has become the main technical solution for weight reduction and safety improvement of vehicle, and the evaluation of formability for advanced high-strength steel with different microstructure and deformation characteristics is more complicated. Therefore, the applicability of existing formability evaluation methods for advanced high-strength steel was verified by experiments and theoretical analysis. For advanced high-strength steel widely used in automobile industry including dual phase steel, complex phase steel, quenched & partitioned steel and dual phase steel with high formability etc., the test and data analysis for conventional formability evaluation methods of strain hardening index, forming limit curve and reaming rate were carried out. It is found that due to the complex strain hardening characteristics of advanced high-strength steel, the strain homogenization and limit formability cannot be characterized by a single strain hardening index or forming limit diagram, and the standard reaming method cannot reflect the sensitivity of edge forming quality. Thus, a new formability evaluation index and system were proposed and discussed, which can be used to compare the formability of advanced high-strength steel more accurately, and provide a reference for material evaluation and part selection.

Funds：

国家重点研发计划资助项目（2017YFB0304403）

作者简介：连昌伟（1982-），男，博士研究生，高级工程师，E-mail：lianchangwei@baosteel.com；通信作者：林建平（1958-），男，博士，教授，E-mail：jplin58@tongji.edu.cn

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