锻压技术

不同扩孔性能的980 MPa级冷轧高强度钢强韧性分析

英文标题：Analysis on strength and toughness of 980 MPa grade cold-rolled high-strength steel with different hole expansion properties

作者：刘家麟

单位：四川工业科技学院智能制造与车辆工程学院

关键词：扩孔率双相钢高扩孔钢极限冷弯叠片冲击强韧性

分类号：TG142.1；U461.91

出版年,卷(期):页码：2025,50(8):301-308

摘要：

选取980 MPa级别双相钢DP980和高扩孔钢DP980-λ开展强韧性对比分析。首先，对比分析两种材料的基体组织、化学成分和退火工艺等，以及静态力学性能、扩孔性能；然后，采用极限冷弯试验对两种材料的极限冷弯角进行对比分析，并对比基体裂纹的差异；基于夏比摆锤冲击试验，对不同温度下两种材料的叠片冲击韧性进行对比分析。结果表明：相较于双相钢DP980，高扩孔钢DP980-λ的屈服强度为746.7 MPa, 提升了约11.85%，屈强比为0.712，提升了12%，强塑积为14.99 GPa·%，提升了约8%；扩孔率均值为63.33%，为双相钢DP980的2.53倍；极限冷弯角达到了96.5°，提升了12.2%；冲击功受温度变化的影响较小，平均值为79.4 J。而双相钢DP980的冲击功受温度影响略大，平均值仅为62.0 J，变化幅度达到13.79%。高扩孔钢DP980-λ表现出更优异的强韧性，能够吸收大量的能量而不发生断裂，表现出更高的安全裕度。

The comparative analysis of strength and toughness for 980 MPa grade dual-phase steel DP980 and high hole expansion steel DP980-λ was conducted. The matrix microstructure, chemical composition, annealing process, static mechanical properties and hole expansion performance of two materials were compared and analyzed. Furthermore, the ultimate cold bending angles of two materials were compared and analyzed by the ultimate cold bending test, and the difference of matrix cracks was also compared. Finally, based on the Charpy pendulum impact test, the laminated impact toughness of two materials at different temperatures was compared and analyzed. The results show that compared with dual-phase steel DP980, the yield strength of high hole expansion steel DP980-λ is 746.7 MPa, an increase of about 11.85%, the yield strength ratio is 0.712, an increase of 12%, and the strength-plasticity product is 14.99 GPa·%, an increase of about 8%, the average hole expansion rate is 63.33%, which is 2.53 times that of dual-phase steel DP980, and the ultimate cold bending angle reaches 96.5°, an increase of 12.2%. The impact energy is less affected by temperature change, and the average impact energy is 79.4 J. The impact energy of dual-phase steel DP980 is slightly more affected by temperature, and the average impact energy is only 62.0 J, with a variation range of 13.79%. Thus, the high hole expansion steel DP980-λ shows better strength and toughness, and can absorb a lot of energy without breaking, showing a higher safety margin.

基金项目：

作者简介：刘家麟（1982-），男，硕士，讲师 E-mail：zzgyyyzcj@yeah.net

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