Please use this identifier to cite or link to this item:
doi:10.22028/D291-27517
Title: | Effect of Carbon Partitioning, Carbide Precipitation, and Grain Size on Brittle Fracture of Ultra-High-Strength, Low-Carbon Steel after Welding by a Quenching and Partitioning Process |
Author(s): | Forouzan, Farnoosh Guitar, M. Agustina Vuorinen, Esa Mücklich, Frank |
Language: | English |
Title: | Metals |
Volume: | 8 |
Issue: | 10 |
Publisher/Platform: | MDPI |
Year of Publication: | 2018 |
Free key words: | low-carbon AHSS Q&P toughness modelling precipitation martensite packet |
DDC notations: | 600 Technology |
Publikation type: | Journal Article |
Abstract: | To improve the weld zone properties of Advanced High Strength Steel (AHSS), quenching and partitioning (Q&P) has been used immediately after laser welding of a low-carbon steel. However, the mechanical properties can be affected for several reasons: (i) The carbon content and amount of retained austenite, bainite, and fresh martensite; (ii) Precipitate size and distribution; (iii) Grain size. In this work, carbon movements during the partitioning stage and prediction of Ti (C, N), and MoC precipitation at different partitioning temperatures have been simulated by using Thermocalc, Dictra, and TC-PRISMA. Verification and comparison of the experimental results were performed by optical microscopy, X-ray diffraction (XRD), Scanning Electron Microscop (SEM), and Scanning Transmission Electron Microscopy (STEM), and Energy Dispersive Spectroscopy (EDS) and Electron Backscatter Scanning Diffraction (EBSD) analysis were used to investigate the effect of martensitic/bainitic packet size. Results show that the increase in the number density of small precipitates in the sample partitioned at 640 °C compensates for the increase in crystallographic packets size. The strength and ductility values are kept at a high level, but the impact toughness will decrease considerably. |
DOI of the first publication: | 10.3390/met8100747 |
Link to this record: | urn:nbn:de:bsz:291--ds-275179 hdl:20.500.11880/28904 http://dx.doi.org/10.22028/D291-27517 |
ISSN: | 2075-4701 |
Date of registration: | 22-Mar-2020 |
Faculty: | NT - Naturwissenschaftlich- Technische Fakultät |
Department: | NT - Materialwissenschaft und Werkstofftechnik |
Professorship: | NT - Prof. Dr. Frank Mücklich |
Collections: | SciDok - Der Wissenschaftsserver der Universität des Saarlandes |
Files for this record:
File | Description | Size | Format | |
---|---|---|---|---|
metals-08-00747.pdf | 4,86 MB | Adobe PDF | View/Open |
This item is licensed under a Creative Commons License