- 期刊
Evaluation of Hydroformability of TRIP Steel Tube by Flaring Test
TRIP鋼管管端擴口性能的研究
摘要
本文利用錐形管端擴口試驗對最新開發的TRIP鋼薄壁管的內高壓成形性能進行了研究。這種利用全新的生產工藝生產的TRIP鋼管的強度能達到600MPa級別。管端擴口試驗的過程可以描述為將一個錐形的工具推進鋼管的內部，直到管端邊部出現破裂，試驗停止。本文採用了管端擴口試驗及其有限元模擬的方法對TRIP鋼管的成形性能進行了研究。為了確定TRIP鋼管的破裂失效參量，在試驗和模擬中採用了具有不同頂角的錐形工具。試驗和模擬結果表明，TRIP鋼管的成型極限隨錐形工具頂角的增大而增大，試驗過程中獲得了良好的TRIP效應。同時可以看出TRIP鋼管具有良好的成形性能，適合應用於內壓成形工藝的研究。
關鍵字
無資料並列摘要
In this study, a newly developed high-strength thin-walled seamless steel tube with a transformation induced plasticity (TRIP) microstructure was evaluated by a conical flaring test for determining hydroformability. The TRIP steel tube of 600 MPa grade was produced by a new technique. In general, pushing a conical tool into a tube until the onset of fracture is known as the flaring test, which is a suitable conventional test for evaluating the circumferential ductility and material behavior of the tube. To investigate the hydroformability of the TRIP steel tube, the flaring test was studied experimentally and numerically. To confirm the circumferential ductility of the TRIP steel tube, the Oyane ductile criterion was used, and the Oyane ductile fracture parameters were determined by the flaring test with different conical tool angles. From the results, it was found that the flaring limit of the TRIP steel tube increases with the increase of the semi-angle of the conical tool. Moreover, the TRIP effect, the strain-induced transformation of small amounts of the retained austenite into martensite flaring test. The TRIP steel tube possesses good formability applicable to the hydroforming process.