TY - GEN A1 - Zimmer, Peter A1 - Kannengießer, Thomas A1 - Florian, Wolfgang A1 - Böllinghaus, Thomas T1 - Kaltrissprüfungen für hochfeste Feinkornbaustähle T2 - Große Schweißtechnische Tagung "Schweißen und Schneiden" 2004 CY - Magdeburg, Deutschland DA - 2004-09-22 PY - 2004 SN - 3-87155-689-0 SN - 0418-9639 N1 - Serientitel: DVS-Berichte – Series title: DVS-Berichte IS - 232 SP - 207 EP - 214 PB - DVS-Verl. CY - Düsseldorf AN - OPUS4-4634 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Zimmer, Peter A1 - Kannengießer, Thomas A1 - Böllinghaus, Thomas T1 - Kaltrissprüfverfahren nach der DVS Richtlinie 1006 T2 - Schweißen und Schneiden 2005 CY - Essen, Deutschland DA - 2005-09-12 KW - Kaltriss KW - Kaltrissprüfung KW - DVS-Richtlinie 1006 PY - 2005 SN - 3-87155-695-5 N1 - Serientitel: DVS-Berichte – Series title: DVS-Berichte IS - 237 SP - 275 EP - 280 PB - DVS-Verl. CY - Düsseldorf AN - OPUS4-11084 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Zimmer, Peter A1 - Böllinghaus, Thomas A1 - Kannengießer, Thomas T1 - Effects of hydrogen on weld microstructure mechanical properties of the high strength steels S 690Q and S 1100QL PY - 2004 UR - http://www.china-weldnet.com/English/information/II-1525-04.htm IS - II-1525-04 SP - 1 EP - 16 PB - International Institute of Welding CY - Paris AN - OPUS4-11851 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Zhang, Lei A1 - Pittner, Andreas A1 - Michael, Thomas A1 - Rhode, Michael A1 - Kannengießer, Thomas T1 - Effect of cooling rate on microstructure and properties of microalloyed HSLA steel weld metals N2 - Two high strength Nb/Ti microalloyed S690QL steels were welded with identical filler material, varying welding parameters to obtain three cooling rates: slow, medium and fast cooling. As cooling rate increased, the predominantly acicular ferrite in Nb weld metal (WM) is substituted by bainite, with a consequence of obvious hardness increase, but in Ti WM, no great variation of acicular ferrite at all cooling rates contributed to little increment of hardness. The transition between bainite and acicular ferrite has been analysed from the point view of inclusions characteristics, chemical composition and cooling rate. Excellent Charpy toughness at 233 K was obtained with acicular ferrite as predominantly microstructure. Even with bainite weld of high hardness, the toughness was nearly enough to fulfill the minimal requirements. WM for Ti steel showed to be markedly less sensitive to the variations of cooling rate than that for Nb steel. KW - High strength steel KW - Weld metal KW - Cooling rate KW - Charpy toughness KW - Acicular ferrite PY - 2015 U6 - https://doi.org/10.1179/1362171815Y.0000000026 SN - 1362-1718 VL - 20 IS - 5 SP - 371 EP - 377 PB - Taylor and Francis CY - London, UK AN - OPUS4-36518 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Zhang, Lei A1 - Kannengießer, Thomas T1 - Austenite grain growth and microstructure control in simulated heat affected zones of microalloyed HSLA steel N2 - The roles of microalloying niobium, titanium and vanadium for controlling austenite grain growth, microstructure evolution and hardness were investigated at different simulated heat affected zones (HAZ) for high strength low alloy (HSLA) S690QL steel. High resolution FEG-SEM has been used to characterize fine bainitic ferrite, martensite and nanosized second phases at simulated coarse and fine grain HAZs. It was found that for Ti bearing steel (Ti/N ratio is 2) austenite grain had the slowest growth rate due to the presence of most stable TiN. The fine cuboidal particles promoted intragranular acicular ferrite (IGF) formation. Nb bearing steel exhibited relatively weaker grain growth retardation compared with titanium bearing steels and a mixed microstructure of bainite and martensite was present for all simulated HAZs. IGF existed at coarse grain HAZ of Ti+V bearing steel but it was totally replaced by bainite at fine grain HAZs. Hardness result was closely related to the morphology of bainitic ferrite, intragranular ferrite and second phases within ferrite. The microstructure and hardness results of different simulated HAZs were in good agreement with welded experimental results. KW - Hardness measurement KW - Microstructure KW - Microalloyed steel KW - Welding KW - Grain growth PY - 2014 U6 - https://doi.org/10.1016/j.msea.2014.06.106 SN - 0921-5093 VL - 613 SP - 326 EP - 335 PB - Elsevier B.V. AN - OPUS4-36520 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Zhang, Lei A1 - Kannengießer, Thomas T1 - HAZ softening in Nb-, Ti- and Ti plus V-bearing quenched and tempered steel welds N2 - Three high-strength Nb-, Ti- and Ti + Vmicroalloyed S690QL steels were welded to investigate the formation of softened HAZ and its impact on tensile properties. The welding was performed with three levels of heat input to produce softened zones with different characteristics (softening width, minimum hardness and softening ratio), and then, further tensile tests were done to study their influence on weld performance. The results showed that Ti bearing steel exhibited the lowest resistance to softening with the presence of largest soften width and lowest hardness value, causing final tensile failure occurred at softened HAZ. The metallurgical reason for the lower hardness is the high fraction of coarse ferrite. Nb- and Ti + V-bearing steels suffered moderate softening, due to high hardenability with addition of Mo, Nb and V, but the softening effect did not remarkably influence the tensile properties of these two steels. KW - Microalloyed steels KW - QT steel KW - Alloy addition KW - MAG welding KW - Heat-affected zone softening PY - 2016 U6 - https://doi.org/10.1007/s40194-016-0299-7 SN - 0043-2288 VL - 60 IS - 2 SP - 177 EP - 184 PB - Springer CY - Heidelberg, Germany AN - OPUS4-36312 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Zhang, L. A1 - Kannengießer, Thomas T1 - lnfluence of microalloy design on heat-affected zone toughness of S690QL steels N2 - Three high-strength Nb-,.Ti- and Ti+ V-bearing S690QL steels were welded to investigate and compare the effects of microalloy addition on heat-affected zone (HAZ) toughness. Charpy V notch impact tests from three microalloyed welds under different cooling rates have been performed. Fractographic examination shows that several factors, including large-sized grain, upper bainite or hard second phase, interact to determine brittle fracture and impaired toughness in Nb-bearing weld with high heat input. In contrast to this reduced toughness, Ti-bearing welds exhibits satisfied toughness regardless of at fast or slow cooling. This is attributed to its limited austenite grain and refines favorable intragranular acicular ferrite structure. Moreover, in the case of such refined structure as matrix, TiN particles are found to be irrelevant to the facture process. The crystallographic results also confirm that high-angle boundaries between fine ferrites plates provide effective barriers for crack propagation and contribute to improved toughness. KW - High-strength steels KW - Microalloyed steels KW - Toughness KW - Cooling rate KW - Microstructure PY - 2018 U6 - https://doi.org/10.1007/s40194-018-0558-x VL - 62 IS - 2 SP - 339 EP - 350 PB - Springer CY - Heidelberg, Germany AN - OPUS4-44792 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Wongpanya, Pornwasa A1 - Böllinghaus, Thomas A1 - Lothongkum, G. A1 - Kannengießer, Thomas T1 - Effects of Preheating and Interpass Temperature on Stresses in S 1100 QL Multi-Pass Butt-Welds KW - Cold cracking KW - Cracking KW - Defects KW - Heat treatment KW - High stength steels KW - Mathematical models KW - Multirun welding KW - Preheating KW - Residual stresses KW - Restraint KW - Steels KW - Structural steels KW - Temperature KW - Weldability tests PY - 2008 SN - 0043-2288 SN - 1878-6669 VL - 52 IS - 3/4 SP - 79 EP - 92 PB - Springer CY - Oxford AN - OPUS4-17334 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Wolf, Martin A1 - Kannengießer, Thomas A1 - Böllinghaus, Thomas ED - Carl E. Cross, ED - John C. Lippold, ED - Böllinghaus, T. ED - Herold, H. T1 - Determination of critical strain rate for solidification cracking by numerical simulation PY - 2008 SN - 978-3-540-78627-6 IS - Part I SP - 77 EP - 92 PB - Springer CY - Berlin AN - OPUS4-24488 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Wolf, Martin A1 - Kannengießer, Thomas T1 - Modern Test Methods for Assessing the Hot Cracking Resistance During Welding of High-Alloyed Steels and Nickel Base Alloys KW - Hot cracks KW - MVT-Test KW - Alloy 602 CA (Material No.: 2.4633, NiCr25FeAlY) KW - Specimen loading speed PY - 2007 SN - 0104-9224 SN - 1980-6973 VL - 12 IS - 1 SP - 73 EP - 77 PB - Associação Brasileira de Soldagem, ABS CY - Rio de Janeiro AN - OPUS4-14797 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -