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Metallurgical concepts for optimized processing and properties of carburizing steel

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Advances in Manufacturing 2016年第2期4卷 105-114页

作者： hardy mohrbacher NiobelCon bvba Schilde Belgium

Carburized steel grades are widely used in applications where high surface near hardness is required in combination with good core toughness as well as high strength and fatigue resistance. The process of carburizing lower to medium carbon containing steel can generally provide this combination of properties and has been prac- ticed for several decades. Such steel is essential in the vehicle power-train, machines and power generation equipment. However, the increasing performance demands by such applications as well as economical considerations forced steel producers to develop better alloys and fabri- cators to design more efficient manufacturing processes. The present paper describes recent concepts for alloy design optimization of carburizing steel and demonstrates the forthcoming beneficial consequences with regard to manufacturing processes and final properties.

关键词： High temperature carburizing Grain sizecontrol Distortion control - Integrated manufacturing Plasma nitriding - Micro pitting - Tooth root fatiguestrength Molybdenum steel Niobium microalloying

Reverse metallurgical engineering towards sustainable manufacturing of vehicles using Nb and Mo alloyed high performance steels

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Advances in Manufacturing 2013年第1期1卷 28-41页

作者： hardy mohrbacher NiobelCon bvba 2970 Schilde Belgium

Steel is the dominant construction material for most industrial goods such as equipments, structures, buildings or vehicles. Although there have been great advances in steel technology over the last 4 decades, the industry currently faces serious sustainability challenges with regard to energy conservation, reduction of CO2 emission and a generally more efficient use of resources. The principal connotation in this respect is increasing steel strength allowing to reduce component weight. However, it is also necessary considering in how far the modified steel properties interfere with typical manufacturing techniques established in the processing chain. A feasible method in this sense is a reverse approach starting from detailed knowledge of the manufacturing process and translating it back into the most suitable metallurgical and microstruc- tural design of steel. Modifying steels towards better manufacturing performance typically involves innovative alloying and metallurgical processing concepts. Niobium and molybdenum are two of the most powerful alloying elements in helping to adapt microstructures and properties with regard to downstream manufacturing processes. This paper will highlight several examples how a reverse met- allurgical engineering approach can be successfully applied to optimize the efficiency of subsequent manufacturing processes with a focus on the automotive industry.

关键词： Automotive flat steel - Engineering steel Stamping Bending - Profiling - Press hardening Welding Cutting Case carburizing

Guest editorial of "Application of high strength steels in lightweight commercial vehicles"

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Advances in Manufacturing 2015年第1期3卷 1-2页

作者： hardy mohrbacher NiobelCon bvba SchildeBelgium

New and increasingly sharp laws for the reduction of emissions from commercial vehicles entered into force in the European Union since 1993 with the aim of substan-tially reducing pollutants and emissions from trucks and buses. Thereby the maximum levels for the emission of particulate matter （basically soot particles） as well as oxides of nitrogen （NOx） have been subsequently lowered. To comply with these demands, commercial vehicle producers had to introduce new emission reducing technologies of which exhaust-gas recirculation （EGR）,

关键词： Guest editorial of Application of high strength steels in lightweight commercial vehicles high

Combined Effects of Nb and B MicroAlloying in Molybdenum Based Ultra Low Carbon Bainitic (ULCB) Steels

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Journal of Iron and Steel Research International 2011年第S1期18卷 785-791页

作者： hardy mohrbacher NiobelCon bvba 2970 SchildeBelgium

ULCB steels have a great potential for structural as well as automotive applications due to the lean alloying concept and the favorable combination of strength and *** steels are being considered as the material of choice for many advanced applications where yield strength above 500 MPa is required to reduce component *** Mo has been a key alloying element in producing such *** order to push the property envelope of ULCB steels it is interesting to combine Mo alloying with the microalloying elements Nb and *** effects between these elements bear synergies that cannot be achieved by single *** paper demonstrates how these synergies can be beneficially used in combination with appropriate processing.

关键词： grain refinement bainitic transformation precipitation hardening accelerated cooling tempering

A Strategy of Avoiding Delayed Fracture in Ultrahigh Strength Automotive Steels by Nb Microalloying

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Journal of Iron and Steel Research International 2011年第S1期18卷 893-897页

作者： hardy mohrbacher NiobelCon bvba 2970 SchildeBelgium

Recently the automotive industry has been confronted with the phenomenon of delayed *** phenomenon was not relevant in earlier years since the strength level of the steels was generally below a critical ***,delayed fracture is not necessarily related to an absolute strength value but rather to microstructural features as well as pre-existing micro-damage in the material that are likely to occur in ultrahigh strength *** microalloying in combination with appropriate processing can effectively help to improve the resistance against delayed fracturing in such *** paper outlines a strategy how to achieve this based on microstructural control and hydrogen trapping.

关键词： delayed fracture niobium microalloying grain refinement hydrogen trapping molybdenum alloying

Innovative manufacturing technology enabling light weighting with steel in commercial vehicles

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Advances in Manufacturing 2015年第1期3卷 3-18页

作者： hardy mohrbacher Marius Spottl Jesse Paegle NiobelCon bvba SchildeBelgium WISCO Lasertechnik GmbH RavensburgGermany Gestamp Sao PauloBrazil

Improved manufacturing technology is often needed when working with high strength steel. In this re- spect manufacturing technology has to adapt to the altered （and typically reduced） formability and weldability of modern high strength steel. However, this is a rather passive approach from a manufacturing point of view. An indeed much more powerful approach is to generate synergies between innovative manufacturing technology, design and material enabling additional weight savings and efficiency gains. Laser-based material processing, in particular laser welding, offers a wide range of opportunities in this sense. Furthermore, hot stamping and roll forming open up new possibilities for advanced manufacturing of commercial vehicle components. Applications and examples of these technologies will be given in terms of producing innovative semi-products as well as final components.

关键词： Commercial vehicles . Light weightingstrength steel . Roll forming - Press forming - Hotstamping . Tailor-welded blanks .Tailor-welded coils

Laser-based manufacturing concepts for efficient production of tailor welded sheet metals

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Advances in Manufacturing 2014年第3期2卷 193-202页

作者： Marius Sp?ttl hardy mohrbacher WISCO Lasertechnik GmbH RavensburgGermany NiobelCon bvba SchildeBelgium

Laser welding is an established manufacturing technology for a large variety of automotive applications due to its attractive properties such as low heat input, high precision and fast welding speed. Especially when welding high strength steels, which are dominantly used in today＇s car body construction, the low heat input by laser welding bears significant advantages with regard to the properties of the weld seam. The exploitation of the full application potential of laser welding in mass production requires an appropriate manufacturing concept and corresponding auxiliary technologies. The present paper demonstrates the integration of laser welding into the surrounding manu- facturing concepts by a modular setup with different levels of automation. This approach offers flexible solutions for individual needs thereby optimizing investment cost, labor cost and productivity. Recently available laser sources enable exceptionally high welding speed on thin gauged sheet metals but require efficient material handling con- cepts to utilize the full speed potential. Industrial concepts are presented offering efficient material handling and high process robustness for mass production welding.

关键词： Laser welding Tailored blanks Tailoredcoils Material handling Process robustness Laser beamsplitting Turbo-welding Weld edge conditioning

Editorial:Industrial relevance of molybdenum in China

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Advances in Manufacturing 2020年第1期8卷 35-39页

作者： Tim Outteridge Nicole Kinsman Gaetano Ronchi hardy mohrbacher International Molybdenum Association LondonUK Department of Materials Engineering KU LeuvenLeuvenBelgium NiobelCon bvba SchildeBelgium

About 80%of all molybdenum mined in the world(not including units recovered via recycling)is used as an alloying element in iron and *** general,the intensity of molybdenum use in China is still lower than in more highly developed regions such as the USA and *** difference is manifest in both carbon steels and stainless steels,suggesting a significant opportunity for more widespread use of molybdenum in the future as China follows its self-reliance policy,calling for more sophisticated *** market development,as being pursued by the International Molybdenum Association(IMOA),is a key asset in that *** article summarizes some key facts on molybdenum mining,use and market development in China.

关键词： China molybdenum industry Global molybdenum reserves Molybdenum applications Enduser markets Molybdenum alloying Market development

Molybdenum alloying in cast iron and steel

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Advances in Manufacturing 2020年第1期8卷 3-14页

作者： Xiang-Ru Chen Qi-Jie Zhai Han Dong Bao-Hua Dai hardy mohrbacher School of Materials Science and Engineering Shanghai UniversityShanghai 200444P.R.China CITIC Machinery Manufacturing Inc. Houma 043011ShanxiP.R.China Department of Materials Engineering KU LeuvenLeuven 3001Belgium NiobelCon bvba Schilde 2970Belgium

Metal casting is an important manufacturing technology for efficiently producing massive components with complex shape.A large share of industrial castings is made from iron and steel alloys,combining attractive properties and low production *** of properties in cast iron and steel is mainly achieved by alloying and in fewer cases by heat *** is an important alloying element in that respect,increasing strength,hardness and *** also facilitates particular heat treatments such as *** paper describes the metallurgical functionality of molybdenum alloying in iron-based castings and demonstrates its effectiveness for applications in the automotive and mining industry.

关键词： Grey cast iron Nodular iron Pearlite Austempering Creep resistance Wear resistant alloys Hardness Toughness Mining industry Automotive industry