Thermomechanical aspect and high-strain rate behavior of next generation advanced high-strength materials

加拿大政府和汽车行业定期审查政策、标准和法规，以确保司机和乘客的安全，并实现到2030年每年温室气体排放目标，从目前的7.04亿吨二氧化碳当量减少到5.17亿吨二氧化碳当量。拟议的冶金研究项目旨在通过开发新型、轻质、清洁和经济的第三代先进高强度钢（AHSS），通过提高汽车的燃油效率来减少加拿大的温室气体排放，同时加强加拿大的经济，采用非常规合金概念，锰含量为8-10 wt%。钢铁不是一种过时的材料。尽管汽车零部件的其他金属轻质材料得到了发展，但在可预见的未来，白车身的重要部件仍然并且将永远由钢材制成。这是因为它的经济，强度和耐用性的特殊组合。事实上，世界各地的钢铁行业都在积极地继续开发下一代AHSS。

The Canadian government and automotive industries regularly review the policies, standards and regulations to ensure the safety of both drivers and passengers, as well as to meet the annual greenhouse emission target from the present 704 megatonnes to 517 megatonnes of carbon dioxide equivalent by the year 2030. The proposed metallurgical research program is aimed to reduce the greenhouse emission of Canada by improving the fuel efficiency of automotive vehicles while strengthening the Canadian economy, through the development of a novel, lightweight, clean and economic third generation advanced high-strength steels (AHSS) using unconventional alloying concepts with manganese content of 8-10 wt%. Steel is not an obsolete material. Despite the development of other metallic lightweight materials for automotive parts, significant parts of the body-in-white are still and will always be made of steel in the foreseeable future. This is because of its exceptional combination of economy, strength and durability. In fact, steel industries around the world are aggressively continuing to develop the next generation AHSS. This project will be divided into four major phases. The first phase is dedicated to alloy design, stacking-fault energy (SFE) analysis, thermodynamic assessment, and casting of novel AHSS. These medium-manganese steels will be designed to achieve tensile strengths of more than 1000 MPa with elongations of 30-40%. The second phase involves heat treatment and cooling cycles of these steels to establish the equilibrium phase transitions, cooling curves and phase diagrams. The third phase involves laboratory-scale simulation of thermomechanical processing such as hot rolling and hot forging to assess the formability of these materials. The crashworthiness will be evaluated by performing high-speed deformation experiments. The fourth and final phase covers extensive microstructural characterization to accurately understand the individual effects of twinning-induced plasticity (TWIP), transformation-induced plasticity (TRIP) and precipitation hardening on the mechanical properties of medium manganese steels. At the end of the project, four new third generation AHSS will be developed and a clear processing-microstructure-property relationship will be established. The commerciality of these materials will also be evaluated. The results from this work are expected to accelerate the design and discovery of new, high-performance and energy-saving materials. Ten highly qualified personnel (HQP), which consist of five graduate (two PhDs and three MScEs) and five undergraduate students are expected to join and strengthen the Canadian automotive and manufacturing industries. They are expected to support the research and development activities and maintain the competitiveness of Canadian industries.