先进高强度汽车用钢板研究进展与技术应用现状

综述了第一、二、三代先进高强度汽车用钢的理论研究与生产现状,并具体介绍了辊压成形、液压成形、热成形、百足成形和链模成形等几种先进高强钢应用技术的最新进展。先进高强度用钢成分与性能体系趋于完备,强塑积从10GPa·%到60GPa·%钢种的研发与应用极大地满足了汽车轻量化选材与用材的需求,可以预见兼具高强度与高塑性的第三代先进高强度汽车板是未来发展的方向,将得到越来越广泛地应用。先进高强度用钢仍有很多与生产相关的技术需要突破,应用技术的开发也需要加大力度。     

汽车用先进高强度钢的开发及应用进展

 先进的高强度钢在汽车减重、节能、提高安全性、降低排放等方面展现出了广阔的前景,在新一代汽车伙伴计划、超轻钢车身——先进概念车等项目上得到了应用和推广。简述了先进高强度汽车用钢板的最新开发和应用进展情况。     

国内外汽车板的现状 需求和发趋势

论述了目前国内外汽车板的质量性能发展状况，分析了汽车结构对板材的要求，钢所面临的挑战及在汽车轻量化中的进展，简述了超深冲钢板的超低碳、洁净化控制，新型高强度钢板和汽车用热镀锌钢板的最新进展，同时指出必须重视高强度钢板等新型汽车板的使用技术研究和开发。     

马钢“高强度冷轧系列双相钢制造及应用技术”通过省重大科技攻关项目验收

<正>安徽省重大科技攻关项目"高强度冷轧系列双相钢制造及应用技术",是顺应汽车轻量化和高性能要求趋势,基于马钢先进的汽车板生产线及研发积淀而开展的攻关项目,利用马钢先进连续退火生产线在国内首家采用高H2喷气冷却控制技术,通过合理的退火工艺设计,开发出系列高强度冷轧双相钢产品;项目组开展汽车用高强度冷轧双相钢成形仿真、焊接、涂装磷化应用技术研究,填补了马钢在汽车用高强钢成形仿真、焊接、涂装磷化应用技术研究上的空白;并     

高强度齿轮钢的开发

本文根据外刊资料，综述阐述了汽车用的高速高强度齿轮钢的开发情况。从齿轮的特性。齿轮的破坏机理出发，探讨了合金设计和新钢种的开发状况。重点阐述了高强度齿轮钢，特别详细的介绍了高弯曲疲劳强度齿轮钢，耐点蚀齿轮钢和０．１８Ｃ－０．７Ｍｎ－１．０Ｃｒ－０．４Ｍｏ高强度齿轮钢的试验研究结果，最后还简要的介绍了喷丸技术在提高齿轮钢强度上的应用情况。本文可供开发新型的高速高强度汽车齿轮用钢参考。     

先进高强钢的显微组织与力学性能

为满足汽车轻量化发展的需求,开发了大量的先进高强度钢,如DP钢、TRIP钢、CP钢、M钢、TWIP钢等.与普通高强钢相比,先进高强钢具有高强度,高能量吸收性、高加工硬化率及优良的烘烤硬化和成形性能等一系列优点,在理论研究和实际应用上引起了人们极大的关注.近年来,世界各国纷纷致力于先进高强钢的研究开发.文章简要介绍了先进高强钢的显微组织与力学性能.     

汽车板的研究开发现状及发展趋势

论述了目前国内外汽车板的发展状况，分析了汽车结构对板材的要求、钢材料所面临的挑战及汽车轻量化的进展，简述了超深冲钢板的超低碳、洁净化控制以及新型高强度热轧钢板、冷轧钢板和汽车用热镀锌钢板的最新进展，同时指出必须重视高强度钢板等新型汽车板使用技术的研究和开发。     

先进的高强度钢及其在汽车工业中的应用

对先进的高强度钢及其在汽车工业中的应用进行了评述，详细介绍了先进的高强度钢的定义、范围、性能特点，高的应变硬化特性，成形性、回弹等，以及成形构件的性能，硬化增量及撞击吸能；最后介绍了这类钢的发展趋势和在汽车轻量化中的应用前景。     

汽车用高强度IF薄钢板

高强度ＩＦ薄钢板是近年来开发的一种兼有高强度和良好深冲性能的汽车用钢板，它是在ＩＦ钢基础上通过添加适量的固溶强化元素来达到高强度的，总结了这种钢中的合金元素对基板性能及热镀锌镀层的影响，另外还介绍了两种新型的高强度ＩＦ钢，结合宝钢设备的情况，分析了高强度ＩＦ薄钢板开发的可行性。     

信息

川崎钢铁公司开发出焊接性能好的高强度汽车用钢日本川崎钢铁公司开发出汽车用焊接性能好的 80kg、1 0 0kg级高强度钢。所开发的高强度钢不仅焊接性能好 ,镀层特性也有所提高。目前川崎公司已开始批量生产这两个强度级别的高强度钢 ,并已在部分汽车制造厂得到应用。传统汽车用高强度钢受碳、磷等元素的影响 ,焊接性能不十分可靠。为克服此缺陷 ,川崎公司选择钛、铌等不损害焊接性能的强化元素 ,并使结晶粒微细化 ,大幅度提了点焊部位的强度 (垂直剥离强度 )。川崎公司所开发的高达 1 0 0kg级汽车用高强度钢焊缝处强度比传统钢焊缝强度高 5 0…     

汽车用第3代先进高强度钢的研发进展

近几十年来,汽车用先进高强度钢(AHSS-Advanced High Strength Steel)是材料的研发重点。第1代以铁素体为基的AHSS钢的强塑积为15 GPa·%,第2代以奥氏体为基的AHSS钢的强塑积为50 GPa·%,其合金含量高和生产工艺控制困难导致成本高,因此正研发第3代多相AHSS钢,通过多相、亚稳和多尺度的组织精细调控,其强塑积为30 GPa·%。第3代AHSS钢以提高第1代AHSS钢强度、塑性和降低第2代AHSS合金含量、生产成本两方面进行研发。本文介绍了超细DP(双相)钢,改进型TRIP(相变诱发塑性)钢,淬火-碳分配(Q&P)钢,超细晶贝氏体钢,超快加热和冷却的贝氏体-铁素体-马氏体钢,高锰铁索体-奥氏体钢和中锰亚稳奥氏体-超细晶基体钢等第3代AHSS钢的研究进展。     

国外汽车用先进高强度钢板及其标准综述

简要介绍了9种先进高强钢的特点和用途以及国外先进高强钢标准的概况,重点分析了欧洲、美国和日本先进高强钢标准的特点和标准间的异同。针对我国的现状,提出了先进高强钢的发展设想以及先进高强钢国家标准的制定原则和实施方法。     

Hydrogen Embrittlement of Automotive Advanced High-Strength Steels

Advanced high-strength steels (AHSS) have a better combination between strength and ductility than conventional HSS, and higher crash resistances are obtained in concomitance with weight reduction of car structural components. These steels have been developed in the last few decades, and their use is rapidly increasing. Notwithstanding, some of their important features have to be still understood and studied in order to completely characterize their service behavior. In particular, the high mechanical resistance of AHSS makes hydrogen-related problems a great concern for this steel grade. This article investigates the hydrogen embrittlement (HE) of four AHSS steels. The behavior of one transformation induced plasticity (TRIP), two martensitic with different strength levels, and one hot-stamping steels has been studied using slow strain rate tensile (SSRT) tests on electrochemically hydrogenated notched samples. The embrittlement susceptibility of these AHSS steels has been correlated mainly to their strength level and to their microstructural features. Finally, the hydrogen critical concentrations for HE, established by SSRT tests, have been compared to hydrogen contents absorbed during the painting process of a body in white (BIW) structure, experimentally determined during a real cycle in an industrial plant.     

Ultra-high strength sheet steel property developments

Conventional advanced high strength steels(AHSS) such as dual-phase,TRIP and martensitic sheet products have undergone extensive development and substantially increased implementation in automobile structures over the past few years.Efforts are now underway to extend these improvements and develop steels with even greater strengths and formability.A variety of alloy/process/microstructure/property approaches aimed at next generation AHSS properties are highlighted here.One approach involves the quenching...     

Effect of Thermo-Mechanical Processing on Precipitate Formation in Next Generation HSLA Steel

Development of advanced high strength steels (AHSS) using a conventional rolling setup is one of the biggest challenges to steel industry.It has been found that fine precipitation in a soft matrix,formed after hot rolling,can markedly improve the mechanical properties.In this work,three dimensional atom probe tomography (3D-APT) has been used to study the formation of precipitates in thermomechanically simulated steel.3D-APT data reveals co-existence of numerous nano clusters with precipitates.Also,quantitative analysis of the nano clusters and precipitates shows clusters are as small as 1nm in size.Precipitates are found to be disc shaped with the composition of equilibrium precipitates (TiMo)C.Thus,3D-APT is seen as an ideal technique to complement TEM to understand the nanoscale features in thermomechanically processed steel for further improvements in the mechanical properties of AHSS.     

首钢热轧酸洗先进高强钢的开发与进展

介绍了首钢热轧酸洗先进高强钢的开发与进展。根据客户的使用要求,结合生产设备,首钢研发了双相钢、高扩孔钢、复相钢、相变诱导塑性钢等系列高强钢。分析了双相钢、高扩孔钢、复相钢以及相变诱导塑性钢等产品的化学成分和力学性能,并利用金相显微镜和扫描电镜等手段对微观组织特征进行了描述。首钢热轧酸洗先进高强钢因出色的力学性能已经在汽车控制臂和纵梁等零件上得到广泛应用,未来将在乘用车减重和安全等方面发挥更大作用。     

Comparative study of resistance spot welding performance between cold-rolled DP980 and Q&P980 steels

Advanced high strength steel (AHSS) has been widely used in the automobile industry.The resistance spot welding performance of DP980 and Q&P980 steels was studied through comparing the two steels’welding current range,tensile shear strength (TSS),cross tension strength (CTS),weld spots’microhardness,etc.The following conclusions were achieved:It is easy for both DP980 and Q&P980 steels to get a nugget size bigger than 4 mm,they all have welding current ranges exceeding 2 kA and high weld strength.     

Fracture Toughness to Understand Stretch-Flangeability and Edge Cracking Resistance in AHSS

The edge fracture is considered as a high risk for automotive parts, especially for parts made of advanced high strength steels (AHSS). The limited ductility of AHSS makes them more sensitive to the edge damage. The traditional approaches, such as those based on ductility measurements or forming limit diagrams, are unable to predict this type of fractures. Thus, stretch-flangeability has become an important formability parameter in addition to tensile and formability properties. The damage induced in sheared edges in AHSS parts affects stretch-flangeability, because the generated microcracks propagate from the edge. Accordingly, a fracture mechanics approach may be followed to characterize the crack propagation resistance. With this aim, this work addresses the applicability of fracture toughness as a tool to understand crack-related problems, as stretch-flangeability and edge cracking, in different AHSS grades. Fracture toughness was determined by following the essential work of fracture methodology and stretch-flangeability was characterized by means of hole expansions tests. Results show a good correlation between stretch-flangeability and fracture toughness. It allows postulating fracture toughness, measured by the essential work of fracture methodology, as a key material property to rationalize crack propagation phenomena in AHSS.     

先进镀锌高强钢中液态金属脆化的研究进展及挑战

先进高强钢广泛用于汽车车身结构,能够在保证车辆安全性的同时使整体车身减重,满足节能减排的要求,在汽车轻量化方面已凸显出巨大的应用潜力.通常汽车用高强钢板需要进行表面镀锌处理以提高车身结构的抗腐蚀能力.但镀锌高强钢板在点焊过程中容易产生液态金属脆化,降低焊接接头的承载性能.镀锌热成形高强钢在热成形过程中也会产生液态金属脆...