通过事先控制低合金 Q&P 钢的微观结构来调节奥氏体稳定性

IF 3 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Melissa Thrun , Virginia Euser , Amy Clarke , Kester Clarke
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引用次数: 0

摘要

淬火和分割(Q&P)加工是一种广为接受的热处理方法,用于制造由铁素体、马氏体和奥氏体组成的高强度钢,同时保持相对较低的制造成本。虽然对先前微观结构影响的研究有限,但了解不同起始微观结构的热处理反应对加工和制造含有残余奥氏体的复杂微观结构钢至关重要,并有可能提供进一步优化性能的机会。本研究调查了起始显微组织(铁素体/珠光体与马氏体)和先前冷加工水平(38% 与 58%)对经过 Q&P 加工的 0.2 C-2.0 Mn-1.5 Si(重量百分比)钢的显微组织发展和机械性能的影响。与铁素体-珠光体的起始显微结构相比,起始马氏体显微结构的样品在 Q&P 加工后保留的奥氏体分数更高,显微结构更均匀。起始马氏体微观结构也显示出更高的加工硬化率和更高的均匀伸长率。在临界退火期间,较大的冷减量加速了溶解动力学和奥氏体的形成,从而使铁素体-珠光体和马氏体起始微观结构的最终微观结构更为相似。本文介绍的结果表明,在 Q&P 加工钢中,改变预加工工艺是操纵和控制奥氏体稳定性的一种途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Tuning austenite stability through prior microstructure control in a low-alloy Q&P steel

Tuning austenite stability through prior microstructure control in a low-alloy Q&P steel
Quenching and partitioning (Q&P) processing is a widely accepted heat treatment methodology for creating high strength steels consisting of ferrite, martensite, and austenite, while maintaining relatively low manufacturing costs. Though the research on effects of prior microstructure is limited, an understanding of the heat treatment response of different starting microstructures is critical to processing and creating steels with complex microstructures that contain retained austenite and may afford opportunities to further optimize properties. This study investigates the influence of starting microstructure (ferrite/pearlite versus martensite) and prior levels of cold work (38 verses 58 %) on the microstructural development and mechanical properties of a 0.2 C-2.0 Mn-1.5 Si (wt.%) steel exposed to Q&P processing. Samples with a starting martensitic microstructure resulted in higher retained austenite fractions and a more homogeneous microstructure after Q&P processing compared to a starting microstructure of ferrite-pearlite. Starting martensitic microstructures also displayed higher work hardening rates and higher uniform elongations. Larger cold reductions saw accelerated dissolution kinetics and austenite formation during intercritical annealing, resulting in more similar final microstructures from the ferrite-pearlite and martensitic starting microstructures. The results presented here indicate that varying prior processing can be a route to manipulate and control austenite stability in a Q&P processed steel.
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来源期刊
Materialia
Materialia MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
6.40
自引率
2.90%
发文量
345
审稿时长
36 days
期刊介绍: Materialia is a multidisciplinary journal of materials science and engineering that publishes original peer-reviewed research articles. Articles in Materialia advance the understanding of the relationship between processing, structure, property, and function of materials. Materialia publishes full-length research articles, review articles, and letters (short communications). In addition to receiving direct submissions, Materialia also accepts transfers from Acta Materialia, Inc. partner journals. Materialia offers authors the choice to publish on an open access model (with author fee), or on a subscription model (with no author fee).
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