The effect of processing parameters on the properties of multi-phase advanced high strength steel grades

研究领域：材料工程-金属和合金汽车制造商正在不断发展和开发新的解决方案，以制造更好的汽车，更省油，更实惠和更安全。钢种的发展是推动汽车工业发展的关键因素。近年来，汽车钢种发生了翻天覆地的变化，钢铁制造商应该做好准备，为不断增长的汽车工业服务。明天的汽车必须是安全、环保、耐用和廉价的。因此，这些汽车对钢材的要求是：高强度钢，以限制重量和保护安全。镀锌，耐用。生产成本降低通过强大的工业流程为汽车工业生产新的钢种，以确保一致的机械性能，这本身就是对钢铁生产商的挑战。多年来，带钢加工生产线技术已经发展，以满足钢种的新要求。随后，新的钢种要求更复杂的热循环和热技术。今天，我们可以确定三个主要里程碑：2000年：双相(DP)-要求快速冷却阶段的等级。2007年：新钢种，如TRIP(相变诱发塑性)，必须在加工DP级钢的同一条连续镀锌线(CGL)上加工。。2012年：使用淬火和分割等多相钢种获得更高的机械性能(TS大于1000兆帕)，需要额外的均热后热处理和更高的热处理温度。热循环的每个阶段都会影响钢的机械性能。新的AHSS(先进高强度钢)牌号的加工在工艺的浸泡阶段后增加了复杂性，因为每个AHSS家族对热循环的要求不同。因此，一条连续镀锌生产线(CGL)需要有足够的灵活性来处理所有这些等级。由于Suk-PT正准备对其现有的CAPL进行投资，使其成为一条结合CGL和CAL能力的“摇摆线”，因此必须对汽车用新型AHSS等级的加工有详细的了解，才能实现稳健的工业过程。这项PHD建议旨在产生关于“工艺参数对具有回火马氏体和回火贝氏体混合组织的多相AHSS牌号性能的影响”的知识。

Research Area: Materials Engineering - metals and alloysCarmakers are continuously evolving and developing new solutions to make better cars, which are more fuel efficient, affordable and safer. The development of steel grades is a key contributor towards the evolution of the automobile industry. There has been a sea change in automotive steel grades over recent years, and steel makers should be prepared to serve the growing automobile industry.Tomorrow's car must be safe, environmentally friendly, durable and cheap. As a result, the requirement of steel for these cars is to be:. High-strength steel to limit weight and preserve safety. Galvanised for durability. Produced with reduced operational costsProduction of new steel grades for the automotive industry through robust industrial process in-order to ensure consistently identical mechanical properties is, in itself a challenge to steel producers.Over years, strip processing line technologies have evolved to match the new requirements of steel grades. Subsequently, new steel grades demanded more sophisticated thermal cycles and thermal technologies. Today, we can identify three major milestones:. 2000: Dual Phase (DP)-grades requesting rapid cooling stages. 2007: New grades, such as TRIP (Transformation Induced Plasticity), must be processed on the same continuous galvanising line (CGL) that processes DP grade steels. . 2012: Higher mechanical properties (TS greater than 1000 MPa) using multi-phase steel grades, such as Quenching & Partitioning, require additional after-soaking heat-treatment together with a higher annealing temperature.Each stage of the thermal cycle will influence the mechanical properties of the steel. Processing of new AHSS (Advanced High strength Steel) grades increases in complexity after the soaking stage of the process as the requirements of the thermal cycle are different for every family of AHSS. Therefore, a continuous galvanising line (CGL) needs to have enough flexibility to process all these grades.Since SUK-PT is preparing for an investment in its existing CAPL for making it a "swing-line" to combine CGL and CAL capabilities, detailed knowledge on the processing of new AHSS grades for Automotive is a must for a robust industrial process. This PhD proposal aims to generate knowledge on "The effect of processing parameters on the properties of multi-phase AHSS-grades having a mixed microstructure of Tempered Martensite and Tempered Bainite".