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| QP和DP钢面内成形性能与边部成形性能对比研究 |
| Forming Limit at Blank Edge and In-plane Surface of QP and DP Steel |
| Received:January 12, 2024 |
| DOI：10.3969/j.issn.1674-6457.2024.06.014 |
| 中文关键词: QP钢 DP钢 面内应变 边部应变 成形性能 |
| 英文关键词: QP steel DP steel in-plane strain edge strain formability |
| 基金项目: |
| Author Name | Affiliation | | YUAN Zhipeng | Research Institute of Baosteel, Shanghai 201900, China
State Key Laboratory of Development and Application Technology of Automotive Steels Baosteel, Shanghai 201900, China | | NIU Chao | Research Institute of Baosteel, Shanghai 201900, China
State Key Laboratory of Development and Application Technology of Automotive Steels Baosteel, Shanghai 201900, China | | SHU Qicheng | Research Institute of Baosteel, Shanghai 201900, China
State Key Laboratory of Development and Application Technology of Automotive Steels Baosteel, Shanghai 201900, China |
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| 中文摘要: |
| 目的 以宝钢生产的QP980、QP1180、DP980、DP1180 4种典型超高强钢材料为研究对象，进行QP、DP钢种材料面内与边部成形特性对比分析。方法 采用单向拉伸设备以及成形试验机，并结合DIC分析技术，对4种材料的力学性能、面内成形性及边部成形性进行试验研究。结果 与DP钢相比，同等强度级别QP钢的均匀延伸率及加工硬化系数均明显更高。在面内成形应变状态下，同等强度级别QP钢极限成形深度均明显大于DP钢的，但主、次应变大小差异不大。在边部成形应变状态下，同等强度级别QP、DP钢极限成形深度以及主、次应变大小均差异不大。QP、DP钢面内成形最大主应变均明显大于边部成形最大主应变。结论 与同强度级别DP钢相比，QP钢具有更高的均匀延伸率及加工硬化系数。QP钢材料的加工硬化系数高，材料内部协同变形能力强，面内成形性能明显优于DP钢材料的，但两者的边部成形性能差异不大;QP、DP钢材料能承受更大的面内主应变，受边部加工硬化及毛刺的影响，冲裁后，边部应变明显降低，在QP、DP超高强钢零件设计制造过程中，应尽可能避免边部发生较大的变形。 |
| 英文摘要: |
| The work aims to study the formability of QP and DP steel at blank edge and in-plane surface with four kinds of ultra-high strength steel materials of QP980, QP1180, DP980 and DP1180 produced by Baosteel as the research objects. Using uni-axial tensile machine and material forming test machine, the mechanical properties, in-plane formability, and edge formability of them were tested and studied with DIC analysis technology. The results showed that the uniform elongation and work hardening coefficient (N value) of QP steel were significantly higher than those of DP steel at similar strength level. Under the strain state of in-plane forming, the ultimate forming depth of QP steel was significantly greater than that of DP steel, but the difference in the magnitude of primary and secondary strains was not significant. Under the strain state of edge forming, the limit forming depth , the magnitude of primary and secondary strains of QP and DP steel had little difference. The maximum principal strain during in-plane forming of QP and DP steel was significantly greater than that during edge forming. The results show that QP steel has higher uniform elongation and work hardening coefficient than DP steel of the same strength grade. QP steel has high work hardening coefficient, strong internal cooperative deformation ability, thus its in-plane formability is obviously better than that of DP steel, while the difference in edge forming performance is not significant. QP and DP steel can bear larger in-plane strain. Under the influence of edge hardening and burr caused by punching or trimming, the edge strain decreases obviously. Therefore, in design and manufacturing of ultra-high strength steel parts with QP and DP steel, large deformation at sheet edge should be avoided as much as possible. |
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