锻压技术

先进高强度钢板成形性能评价方法的适用性分析

英文标题：Applicability analysis on evaluation method of formability for advanced high-strength steel sheet

作者：连昌伟林建平牛超

分类号：TG142.1

出版年,卷(期):页码：2021,46(11):231-237

摘要：

应用高强度钢和超高强度钢成为汽车减重和提高安全性的主要技术解决方案。不同组织特性和变形特征的先进高强钢，其成形性能的评价更为复杂。通过实验和理论分析验证现有成形性能评价方法对先进高强度钢的适用性。选取汽车行业应用广泛的先进高强度钢，包括双相钢、复相钢、淬火延性钢和高成形性双相钢等，进行应变硬化指数、成形极限曲线和扩孔率等常规成形性能评价方法的检测和数据分析，发现由于先进高强度钢的复杂应变硬化特性，不能采用单一的应变硬化指数或成形极限图来表征其应变均化和极限成形能力，标准的扩孔率方法不能反映材料边部成形质量的敏感性。提出并讨论了新的成形能力评价指标及体系，用于更准确地对比先进高强度钢的成形性能，为材料评价和零件选择提供参考。

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.

基金项目：

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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