Wissenschaftliche Artikel der BAM
Filtern
Dokumenttyp
- Zeitschriftenartikel (32) (entfernen)
Sprache
- Englisch (32)
Schlagworte
- Additive manufacturing (6)
- Residual stresses (6)
- Welding (6)
- Ultrasonic-assisted milling (5)
- Creep-resistant steel (4)
- Diffusible hydrogen (4)
- High-strength steel (4)
- Stress relief cracking (4)
- Surface integrity (4)
- Alloy 36 (3)
- Post weld heat treatment (3)
- Residual stress (3)
- Additive Manufacturing (2)
- Alloy modification (2)
- GMA welding (2)
- Gas metal arc welding (2)
- Heat control (2)
- High-strength structural steel (2)
- Hydrogen-assisted cracking (2)
- Implant test (2)
- In situ measurement (2)
- LIBS (2)
- Plasma-transferred arc welding (2)
- Solidification cracking (2)
- Submerged arc welding (2)
- WAAM (2)
- 2101 duplex stainless steel (1)
- 3D Scanning (1)
- AGIL (1)
- Austenitic stainless steels (1)
- Chemical composition (1)
- Co-Cr-alloy (1)
- Cobalt-chromium alloy (1)
- Cold cracking (1)
- Cold cracking safety (1)
- Component test (1)
- Component-like test (1)
- Computed tomography (1)
- Cutting forces (1)
- DED-arc (1)
- Diffraction-elastic constants (1)
- Digital image correlation (1)
- Duplex stainless steel (1)
- Evaporation (1)
- Fatigue Strength (1)
- Fractography (1)
- Fracture Mechanics (1)
- HAZ-softening (1)
- Heat-affected zone (1)
- High-strength filler metals (1)
- High-strength steel filler metal (1)
- High-strength steels (1)
- Hydrogen (1)
- Hydrogen diffusion (1)
- Hydrogen embrittlement (1)
- Hydrogen measurement (1)
- IBESS Approach (1)
- IN725 (1)
- LIBS TIG welding (1)
- LTT filler metal (1)
- Laser-based additive manufacturing (1)
- Local Weld Geometry (1)
- MVT (1)
- Machining (1)
- Mechanical Engineering (1)
- Mechanics of Materials (1)
- Metals and Alloys (1)
- Microalloying influences (1)
- Microcracking (1)
- Microfocus X-ray computer tomography (μCT) (1)
- Microstructure (1)
- Minimum Waiting Time (1)
- Modification of structural morphology (1)
- Neutron diffraction (1)
- Ni alloy (1)
- Offshore (1)
- Offshore steel grade (1)
- Post-weld heat treatment (1)
- Projekt AGIL - Alterung additiv gefertigter metallischer Materialien und Komponenten (1)
- Repair-welding (1)
- Residual Stress (1)
- Residual stress analysis (1)
- Stainless Steel (1)
- Stainless steel (1)
- Steel (1)
- Strain-free lattice spacing (1)
- Synchrotron radiation (1)
- TEKKEN (1)
- TIG welding (1)
- Thermodynamic simulation (1)
- Thick-walled (1)
- Varestraint test (1)
- Varestraint testing (1)
- Weld metal cracking (1)
- Welded Joints (1)
- Wind energy (1)
- X-ray and Neutron Diffraction (1)
- X-ray and neutron diffraction (1)
- X-ray diffraction (1)
- X-ray refraction (1)
Organisationseinheit der BAM
- 9.4 Integrität von Schweißverbindungen (32) (entfernen)
Paper des Monats
- ja (5)
Welding of 13CrMoV9-10 vanadium steel requires care due to an increased susceptibility to stress relief cracking during post weld heat treatment. Previous research into the crack formation in creep-resistant steels has focused on thermal and metallurgical factors; however, little knowledge has been gathered regarding the crack formation during post weld heat treatment considering real-life restraint conditions. This work is subdivided in two parts. Part I showed that an increasing heat input during submerged arc welding under restraint led to an increasing stress level in the joint prior to the post weld heat treatment. The magnitude of stress relief cracking observed in the heat-affected zone after the post weld heat treatment is affected by the heat input. In Part II of this work, the cracks and the associated microstructure which occurred under restraint were studied. The application of a Special acoustic emission analysis indicated that the cracks formed in a temperature range between 300 and 500 °C during the post weld heat treatment. The toughness in the heat-affected zone of the restrained welds was affected by the welding heat input.
Microstructural analyses of all specimens revealed accelerated aging due to precipitation of carbides during post weld heat treatment under restraint.
High-strength structural steels are used in machine, steel, and crane construction with yield strength up to 960 MPa. However, welding of these steels requires profound knowledge of three factors in terms of avoidance of hydrogen-assisted cracking (HAC): the interaction of microstructure, local stress/strain, and local hydrogen concentration. In addition to the three main factors, the used arc process is also important for the performance of the welded joint. In the past, the conventional transitional arc process (Conv. A) was mainly used for welding of high-strength steel grades. In the past decade, the so-called modified spray arc process (Mod. SA) has been increasingly used for welding production. This modified process enables reduced seam opening angles with increased deposition rates compared with the Conv. A. Economic benefits of using this arc type are a reduction of necessary weld beads and required filler material. In the present study, the susceptibility to HAC in the heat-affected zone (HAZ) of the high-strength structural steel S960QL was investigated with the externally loaded implant test. For that purpose, both Conv. A and Mod. SA were used with same heat input at different deposition rates. Both conducted test series showed same embrittlement index “EI” of 0.21 at diffusible hydrogen concentrations of 1.3 to 1.6 ml/100 g of arc weld metal. The fracture occurred in the HAZ or in the weld metal (WM). However, the test series withMod. SA showed a significant extension of the time to failure of several hours compared with tests carried out with Conv. A.