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SHAPING AHSS AND UHSS A CHALLENGE FOR TOOL STEELS

机译：塑造AHSS和UHSS对工具钢的挑战

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摘要

The excellent combination of high strength, high energy absorption during deformation andrnstrain hardening of advanced high strength steels (AHSS) and ultra high strength steelsrn(UHSS) have permitted their increasing use in the automobile industry to diminish vehiclernweight and thereby fuel consumption while improving crash performance. However, formingrnprocesses of such high strength materials involve severe difficulties due to the high loadrnrequirements that increase to a great extent the tool demands in terms of toughness andrnhardness properties. In this work, new tool steels are developed in order to reduce theserndrawbacks. In doing so, a detailed characterization of tool steels used in forming processes ofrnAHSS and UHSS has been assessed to distinguish main failure mechanisms andrntribomechanical functionality of different carbides, nitrides, borides and oxides. Thernmicrostructural optimisation, in terms of matrix composition as well as nature, morphology,rnsize and distribution of second phase particles, has been crucial in the development of a newrngeneration of tool steels with exceptional combination of properties, which make them the bestrncandidates for shaping high strength materials as AHSS and UHSS. The new tool steelsrndeveloped were tested in the most soliciting field studies and two case studies are reportedrnherein.
机译：高强度高强度钢（AHSS）和超高强度钢（UHSS）的高强度，变形过程中的高能量吸收和应变硬化的完美结合，使它们在汽车工业中的使用量越来越大，从而减轻了车辆的重量，从而降低了燃油消耗，同时改善了碰撞性能。然而，由于高载荷的要求，这种高强度材料的成型工艺存在严重的困难，这在很大程度上增加了工具在韧性和硬度特性方面的要求。在这项工作中，开发了新的工具钢以减少严重缺陷。这样做时，已评估了用于rnAHSS和UHSS成形过程中的工具钢的详细特性，以区分不同碳化物，氮化物，硼化物和氧化物的主要破坏机理和摩擦力学功能。在基体组成以及第二相颗粒的性质，形态，尺寸和分布方面，微观组织优化对新一代具有卓越性能组合的工具钢至关重要，这使它们成为塑造高强度的最佳候选者作为AHSS和UHSS的材料。在最广泛的现场研究中测试了开发的新工具钢，并在此报道了两个案例研究。

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