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首页> 外文会议>International Conference on Processing Manufacturing of Advanced Materials >Advanced Bainitic and Martensitic Steels with Carbide-Free Microstructures Containing Retained Austenite
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Advanced Bainitic and Martensitic Steels with Carbide-Free Microstructures Containing Retained Austenite

机译：高级贝氏体和马氏体钢，含有残留奥氏体的无碳化物微结构

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Recent decades have witnessed some remarkable advances in engineering steels driven by the need to respond to challenges posed, for example, by recovery and transmission of oil and gas, or enhanced vehicle safety and fuel economy. Foremost amongst these must surely be the extended application of carbon steels, achieved principally through ferrite grain refinement by the practice of microalloying coupled with controlled thermomechanical processing. Limitations to strengthening ferrite/pearlite structures further by grain refinement or precipitation, however, has focused attention back to acicular forms of microstructure. One of the most interesting advances in this area has been the development of bainitic steels, which have been almost dormant since the mid-20th century. This resurgence may partly be attributed to a better appreciation of the bainite transformation mechanism, and the experimental work for this which unexpectedly spawned some interesting bainitic microstructures which have seen further development and application. These are the so-called 'carbide-free' bainites, which employ alloying to replace carbides, principally cementite, with carbon-stabilized retained austenite. Particularly noteworthy has been the emergence of the transformation induced plasticity (TRIP) sheet steels with enhanced properties principally targeted for automotive use. It is worth mentioning also that a parallel development has produced similar microstructure in austempered ductile irons (ADI), another important ferrous alloy which has seen recent expanding interest in its application. Even more recently, as we proceed into the 21st century, the concept of employing steel microstructures containing carbonenriched retained austenite, has been developed further by combining both alloying and novel heat treatment procedures to exchange 'bainitic' ferrite with 'martensitic' ferrite. Interestingly, this nonequilibrium 'quenching and partitioning' process route also offers the possibility to increase the retained austenite carbon concentration to very high levels, potentially revealing new and previously unobtainable properties.
机译：最近几十年目睹了工程钢材的一些显着进展，这些钢铁的需要应对挑战，例如，通过恢复和传播石油和天然气，或增强的车辆安全和燃料经济性。在这些中最重要的是肯定是碳钢的延长施加，主要通过铁氧体晶粒细化通过微合金化与受控的热机械加工相结合。然而，通过晶粒细化或沉淀进一步加强铁氧体/珠光体结构的限制将注意力集中在微观结构的针状形式。这一领域最有趣的进展之一是贝氏体钢的发展，自20世纪中叶以来几乎存在休眠。这种复兴可能部分地归因于贝氏体转化机制的更好升高，以及这一点的实验工作意外地产生了一些有趣的贝氏体微观结构，这些微观结构已经进一步发展和应用。这些是所谓的“无碳化物”贝氏体，它采用合金化替代碳化物，主要是渗碳石，用碳稳定的保留奥氏体。特别值得注意的是，转化诱导的塑性（跳闸）板钢的出现，具有增强的性质，主要针对汽车使用。值得一提的是，并行发展在奥氏体延展性熨斗（ADI）中产生了类似的微观结构，这是另一个重要的黑色合金，其近期在其应用中扩大兴趣。甚至更近，随着我们进入21世纪，通过将合金化和新的热处理程序与“马氏体”铁氧体交换'贝氏体'铁氧体交换'贝氏体'铁氧体，进一步开发了使用含有CarboneRiched保留奥氏体的钢微观结构的概念。有趣的是，这种非QuigiBribium'淬火和分区'过程途径还提供了将保留的奥氏体碳浓度增加到非常高的水平，潜在地揭示新的和以前无法获得的性质。

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