Manufacturing of Parts in Ultra High Strength Steel Using Local Heat Treatment

2006 ◽  
Author(s):  
Bjo¨rn Carlsson ◽  
Domenico Russo ◽  
Jesu´s Arin˜o Oliver
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
High Strength ◽  
Local Heat ◽  
Side Impact ◽  
Risk Of Fracture ◽  
Tailor Welded Blanks ◽  
Local Heat Treatment ◽  
Heat Treated ◽  
Ultra High Strength Steel

In this paper the manufacturing of a side impact beam, with the aid of local heat treatment, is described. The beam has two areas where the risk of fracture is high. Two zones of the blank, corresponding to these areas, are therefore heat treated before stamping to reduce the risk of fracture. The material is a martensitic steel with a virgin tensile strength of 1200 MPa. The heat treatment is made by laser to an approximate temperature of 850° Celsius. This heat treatment reduces the strength of the material to a tensile strength of approximately 650 MPa after cooling. The formability is increased accordingly. The method of local heat treatment with the objective to increase formability in selected areas can be seen as an alternative to the use of conventional tailor welded blanks.

scholarly journals Numerical and experimental investigations for distortion-reduced laser heat treatment of aluminum

2021 ◽  
Author(s):  
Nikolaos Rigas ◽  
Marion Merklein
Keyword(s):  
Heat Treatment ◽  
Material Flow ◽  
Treatment Strategies ◽  
High Strength ◽  
Local Heat ◽  
Experimental Investigations ◽  
Heat Treated ◽  
Local Softening ◽  
Materials Used ◽  
Automated Handling

AbstractIn the field of mobility, increased safety and emission requirements lead to steadily rising demands on materials used and their performance. Over the last decades, 5000 and 6000 series aluminum alloys have become more and more attractive as lightweight material due to their beneficial weight to strength ratio. The 7000 series offers extended lightweight potential due to its high strength. Until now, this class of alloys has not been widely used in mass production due to its limited corrosion resistance and poor forming behavior. By using so-called Tailor Heat Treated Blanks, it is possible to set increased forming limits of previously locally heat treated components. The reason for the enhanced formability is the local softening, with the resulting improved material flow and the reduced critical forming stresses of the sheet metal before the forming operation. Despite these advantages, the use of previously heat treated materials has been very limited so far. For example, the distortion that occurs during local heat treatment reduces geometrical accuracy and thus automated handling. Therefore, the focus of this thesis is the investigation of tailored heat treatment strategies, permitting a distortion-reduced local short-term heat treatment. For this purpose, the distortion behavior is represented and quantified both numerically and experimentally. The generated knowledge is then transferred to a large volume component and characterized.

scholarly journals Effect of welding and heat treatment on the properties of UHSS used in automotive industry

2021 ◽  
Vol 250 ◽  
pp. 05015
Author(s):  
Gulshan Noorsumar ◽  
Dmitry Vysochinskiy ◽  
Even Englund ◽  
Kjell G. Robbersmyr ◽  
Svitlana Rogovchenko
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Automotive Industry ◽  
High Strength ◽  
Heat Treatments ◽  
Inert Gas ◽  
Element Analysis ◽  
Heat Treated ◽  
Ultra High Strength Steel ◽  
Metal Inert Gas Welding

This paper deals with the undesired effects of the heat treatments on the mechanical properties of (UHSS) Ultra High Strength Steel used nowadays in automotive industry to improve crashworthiness performance of vehicles. The UHSS specimens were extracted from certain parts of the car body and subjected to different heat treatments. Four types of specimens were tested: untreated, welded with metal inert gas welding, heat treated at 800 °C, and heat treated at 1250 °C. All heat-treated specimens showed dramatically reduced values of strength. The results suggest that it is important to follow the official repair manuals avoiding unnecessary welding and improper heat treatments of UHSS. The experiments provide the data necessary for constructing a constitutive model and performing a finite-element analysis of improperly repaired UHSS parts.

Designing Local Properties of Constructional Elements by Local Use of Ageing Effects in Multiphase Steels

2010 ◽  
Vol 638-642 ◽  
pp. 3062-3067 ◽  
Author(s):  
Mehdi Asadi ◽  
Heinz Palkowski
Keyword(s):  
Heat Treatment ◽  
High Strength ◽  
Local Heat ◽  
Processing Parameters ◽  
Strengthening Effect ◽  
Complex Phase ◽  
Heat Treated ◽  
Local Properties ◽  
Local Use ◽  
Multiphase Steels

The investigations deal with processes leading to local effects of strengthening in multiphase steels, being characterized by good formability, continuous yielding, high strength and a strong bake hardening and ageing effect. Dual phase and complex phase steels are under investigation to examine the effect of thermo-mechanical processing parameters on local ageing ability and its use for designed properties. For this purpose local heat treatment by laser are studied, as well as stability of local ageing on the adjusted strength. A remarkable increase of the hardness in the heat treated zone was observed. Stability of the local strengthening effect could be confirmed. Partial heat treatment of multiphase steels by laser can open a new field of application for the local use of the strengthening effect to influence only relevant areas, thus giving potential for energy saving.

scholarly journals Underwater In Situ Local Heat Treatment by Additional Stitches for Improving the Weldability of Steel

2020 ◽  
Vol 10 (5) ◽  
pp. 1823 ◽  
Author(s):  
Jacek Tomków ◽  
Anna Janeczek
Keyword(s):  
Heat Treatment ◽  
Hsla Steel ◽  
Water Environment ◽  
High Strength ◽  
Hardness Measurement ◽  
Local Heat ◽  
Cold Cracking ◽  
Local Heat Treatment ◽  
The Face

In this paper the influence of in situ local heat treatment performed by additional stitches on the weldability of high-strength low-alloy (HSLA) S355J2C+N steel was tested. The investigated steel is characterized by high susceptibility to cold cracking. It is necessary to find a method to improve the quality of welded joints. The local heat treatment was applied as an effect of bead-on plate welding made on the face of a Tekken test joint. The specimens were made by the use of covered electrodes in the water environment. For testing weldability, Tekken test specimens were made. Then, the different number of the pad welds with different overlapping were laid on the face of the tested welds. Non-destructive (NDT) visual and penetrant tests were undertaken. During the NDT, imperfections like shape mistakes and spatters were found. Then, metallographic macro- and microscopic testing were performed. The macroscopic observations proved that water environment can generate imperfections like cracking and pores. However, for specimens with additional stitches the number of imperfections decreased. Microscopic tests proved that the proposed technique affected the structure of the heat-affected zone (HAZ). The specimens without the application of additional stitches are characterized by brittle bainitic and martensitic structure. Specimens, in which the additional stitches were applied, contain tempered martensite, fine ferrite and fine pearlite in their HAZ. It was also observed that the number of cracks decreased for in situ local heat-treatment specimens. The final step was Vickers HV10 hardness measurement. These measurements confirmed previous results. The heat from additional stitches affected the steel by significantly decreasing the hardness by 80–100 HV10. The results of experiments showed that the heat from pad welds provided microstructural changes in heat-affected zones and a decrease in the susceptibility to cold cracking, which results in improvement in the weldability of HSLA steel in wet welding conditions.

Local heat treatment of high strength steels with zoom-optics and 10kW-diode laser

2012 ◽  
Author(s):  
Markus Baumann ◽  
Volker Krause ◽  
Georg Bergweiler ◽  
Martin Flaischerowitz ◽  
Janko Banik
Keyword(s):  
Heat Treatment ◽  
Diode Laser ◽  
High Strength Steels ◽  
High Strength ◽  
Local Heat ◽  
Local Heat Treatment

Optimization of the Heat Treatment Layout and Blank Outline of THTB

2013 ◽  
Vol 554-557 ◽  
pp. 2465-2471 ◽  
Author(s):  
Michael Lechner ◽  
Andreas Kuppert ◽  
Hinnerk Hagenah ◽  
Marion Merklein
Keyword(s):  
Heat Treatment ◽  
High Strength ◽  
Local Heat ◽  
Forming Limit ◽  
Forming Process ◽  
Cold Forming ◽  
New Approach ◽  
Heat Treated ◽  
Generic Term ◽  
Definition Of

Tailored heat treated blanks (THTB) is the generic term for an innovative approach to enhance the formability of blanks made out of high strength steel or aluminum alloys. Key idea of the technology is the adaption of the mechanical properties by a local heat treatment. Based on the new property distribution, the material flow during the forming operation can be improved and the forming limit can be enhanced. In comparison to conventional temperature assisted approaches the forming is performed at room temperature and therefore all advantages of a cold forming process can be used. Most challenging within the application is the definition of the heat treatment layout. Up to now the layout is dimensioned in a time-consuming trial and error procedure. In this paper a new approach for the automatic optimization of the heat treatment layout and the blank outline is presented.

CRUCIBLE D6

Alloy Digest ◽  
1962 ◽  
Vol 11 (5) ◽  
Keyword(s):  
Fracture Toughness ◽  
Tensile Strength ◽  
Low Temperature ◽  
High Strength Steel ◽  
High Strength ◽  
Heat Treating ◽  
Steel Company ◽  
Temperature Performance ◽  
Ultra High Strength Steel ◽  
Crucible Steel

Abstract Crucible D6 is a low alloy ultra-high strength steel developed for aircraft-missile applications and primarily designed for use in the 260,000-290,000 psi tensile strength range. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness, creep, and fatigue. It also includes information on low temperature performance as well as forming, heat treating, machining, and joining. Filing Code: SA-129. Producer or source: Crucible Steel Company of America.

USS STRUX

Alloy Digest ◽  
1960 ◽  
Vol 9 (7) ◽  
Keyword(s):  
United States ◽  
Tensile Strength ◽  
High Strength ◽  
Notch Toughness ◽  
United States Steel Corporation ◽  
Treated Condition ◽  
High Strength Level ◽  
Heat Treated ◽  
Heat Treated Condition ◽  
Very High

Abstract USS STRUX is an alloy steel designed for use in the heat treated condition at a minimum tensile strength of 280,000 psi. At this very high strength level the steel has adequate ductility and notch toughness for critical applications. This datasheet provides information on composition and tensile properties. Filing Code: SA-100. Producer or source: United States Steel Corporation.

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