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Järn, Sanna
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Topics
Publications (6/6 displayed)
- 2023The effect of scrap originating trace elements on the properties of low alloyed steelscitations
- 2021Effect of Steel Composition and Processing Parameters on the Penetration Depth of Micro Cracks in ZnFe Coated Boron Steelscitations
- 2020Press hardening of zinc-coated boron steels: Role of steel composition in the development of phase structures within coating and interface regionscitations
- 2018Press hardening of zinc-coated boron steels: Role of steel composition in the development of phase structures within coating and interface regionscitations
- 2016ZnFe Coated 22MnB5 Steels in Direct Press Hardening: the Relationships between Coating Structure and Process Parameterscitations
- 2015Method of manufacturing a galvannealed steel strip product for hot press forming, method of manufacturing a hot-pressed steel component, and galvannealed steel strip product
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article
Effect of Steel Composition and Processing Parameters on the Penetration Depth of Micro Cracks in ZnFe Coated Boron Steels
Abstract
Liquid metal assisted cracking (LMAC) and so‐called micro cracking, are limiting the application of hot‐dip galvanized boron steels in the direct press hardening process. This study addresses the role of steel hardenability on the micro cracking behavior of ZnFe coated (galvannealed) boron steels 22MnB5 and 22MnMoB8. Several soaking times and forming start temperatures in the range of 800‐520 °C were examined using a laboratory press hardening equipment with a hat‐profiled forming tool. The results indicate that the penetration depth of micro cracks can be reduced by improving the hardenability of steel, which enables hot forming in austenitic state at exceptionally low temperatures even without accelerated cooling procedures. The austenite decomposition of 22MnB5 leads easily to heterogenous microstructure (ferrite + austenite/martensite) below the coating/steel interface, which promotes the penetration of micro cracks. The crack depth is generally reduced with a conversion‐delayed 22MnMoB8 steel, however, a crucial reduction is attained only at lowest hot forming temperatures 550 °C and 520 °C. The results of 22MnMoB8 uncouple the effect of high temperature ferrite formation from the micro cracking mechanisms and suggests that the embrittling effect from zinc or zinc‐rich intermetallic phases plays a crucial role at conventional hot forming temperatures 800‐600 °C. ; Peer reviewed