A Novel Process for Hot‐Galvanized Quenching and Partitioning Steel with Excellent Yield–Ductility Synergy by Prior Treatment
A Novel Process for Hot‐Galvanized Quenching and Partitioning Steel with Excellent Yield–Ductility Synergy by Prior Treatment
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DOI：
10.1002/srin.202200949
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发表时间：
2023-07
影响因子：
2.2
通讯作者：
Y. Wang;Tianyu Zhang;Yunbo Xu;Yuan Wang;X. Hou
中科院分区：
文献类型：
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作者：
Y. Wang;Tianyu Zhang;Yunbo Xu;Yuan Wang;X. Hou
本工作旨在通过预处理获得具有优异屈服-延展性协同作用的热镀锌淬火和分配（Q&P）钢的工艺。为此，在连续镀锌线（CGL）兼容的Q&P处理之前，对具有铁素体-珠光体组织的冷轧板进行“淬火（Q）”、“淬火和回火（Q&T）”、“淬火和等温淬火（QAT）”以及“淬火和等温淬火后回火（QAT&T）”。与Q&P试样相比，Q + Q&P、Q&T + Q &P、QAT + Q&P和QAT&T + Q&P试样可获得更均匀的膜状/板条状残余奥氏体（RA），且C浓度增加，从而提供相变诱发塑性（TRIP）效应，显著提高伸长率。在Q&T和QAT&T试样中，由于晶界和铁素体颗粒等形核位置的增加，获得了最大的奥氏体逆相变速率。QAT&T + Q&P试样具有最长的断裂前平台区，屈服强度为694 MPa，抗拉强度为927 MPa，总延伸率为31.3%，强伸乘积大于29 GPa%，获得了良好的力学性能。
The present work is aimed at a process to obtain a hot‐galvanized quenching and partitioning (Q&P) steel with excellent yield–ductility synergy by prior treatment. For this purpose, the cold‐rolled sheets with ferrite–pearlite structure are applied to “quenching (Q),” “quenching and tempering (Q&T),” “quenching and austempering (QAT),” and “quenching and austempering followed by tempering (QAT&T)” before the continuous galvanizing line (CGL)‐compatible Q&P treatment. Compared with Q&P sample, Q + Q&P, Q&T + Q&P, QAT + Q&P, and QAT&T + Q&P samples can obtain more homogeneous filmy/lath retained austenite (RA) with an increased C concentration, which can provide the transformation‐induced plasticity (TRIP) effect and improve elongation significantly. The maximum austenite reverse transformation rates are obtained in Q&T and QAT&T samples because of the increased nucleation sites, such as grain boundaries and cementite particles. QAT&T + Q&P sample has the longest plateau region before break and obtains the attractive mechanical properties with a yield strength of 694 MPa, tensile strength of 927 MPa, total elongation of 31.3%, and product of strength and elongation above 29 GPa%.