Quenched and Partitioned Microstructures Produced via Gleeble Simulations of Hot-Strip Mill Cooling Practices
Quenched and Partitioned Microstructures Produced via Gleeble Simulations of Hot-Strip Mill Cooling Practices
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DOI：
10.1007/s11661-011-0648-5
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发表时间：
2011-03
期刊：
影响因子：
--
通讯作者：
G. A. Thomas;J. Speer;D. Matlock
中科院分区：
文献类型：
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作者：
G. A. Thomas;J. Speer;D. Matlock
以前的研究人员报道了淬火和分割(Q&P)组织在淬火后的等温退火过程中通过碳从马氏体分配到奥氏体，以形成部分马氏体的初始组织。然而，以前的研究中使用的热分布不太适合于直接从热轧带钢中创建Q&P组织。在这项工作中，通常使用的Q&P热分布(即，具有等温分区步骤)被修改以评估在卷绕线圈冷却期间可能发生的非等温分区。因此，有可能评估直接从热轧产生Q&P组织和性能的潜力。采用代表热轧带钢冷却实践的Gleeble热模拟方法，采用0.19C-1.59Mn-1.63Si(wt%)钢，通过改变淬火/卷取温度(CTs)来创建双相、Q&P、相变诱发塑性(TRIP)和常规组织。显微组织和力学性能数据表明，热轧可能是高强度Q&P钢的一条可行的工艺路线。
Previous researchers reported on quenched and partitioned (Q&P) microstructures producedviacarbon partitioning from martensite into austenite during isothermal annealing after quenching to develop a partially martensitic initial structure. However, the thermal profile used in previous studies is not well suited to creating Q&P microstructures directly from a hot-strip mill. In this work, the commonly employed Q&P thermal profile (i.e., having an isothermal partitioning step) was modified to evaluate nonisothermal partitioning that might instead occur during cooling of a wound coil. Thus, it was possible to assess the potential for creating Q&P microstructures and properties directly off of the hot mill. Gleeble thermal simulations representative of a hot-strip mill cooling practice were used to create dual-phase, Q&P, transformation-induced plasticity (TRIP), and conventional microstructures by varying the quench/coiling temperatures (CTs) using a 0.19C-1.59Mn-1.63Si (wt pct) steel. Microstructural and mechanical property data indicate that hot rolling might be a viable processing route for high-strength Q&P steels.