The relationship between microstructure and fracture behavior of fully austenitic type 316L weldments at 4.2 K
| Autor: | M. C. Juhas, J. C. Lippold, E. N. C. Dalder |
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| Rok vydání: | 1985 |
| Předmět: |
Austenite
Structural material Materials science Metallurgy technology industry and agriculture Metals and Alloys Welding respiratory system Condensed Matter Physics Microstructure law.invention Fracture toughness Mechanics of Materials law Martensite Ultimate tensile strength Fracture (geology) Composite material |
| Zdroj: | Metallurgical Transactions A. 16:1835-1848 |
| ISSN: | 2379-0180 0360-2133 |
| DOI: | 10.1007/bf02670371 |
| Popis: | Multipass weld deposits produced with a Mn-modified Type 316L filler material exhibited fracture toughness nearly 100 MPa√m less than that of a conventional 316L filler material when tested at 4.2 K. Although fracture in both materials occurred by ductile rupture, the crack path in the Mn-modified weld metal was microstructure-specific. The resultant fracture surface exhibited a “corduroy” morphology which reflected the underlying solidification pattern. Corresponding fracture surfaces in compact tension and tensile specimens from the standard 316L weld deposits showed little tendency for microstructure-specific fracture. A model is proposed which relates the fracture morphology and fracture toughness to the microstructural stability of the austenite during testing at 4.2 K. Partitioning of manganese and molybdenum to cellular dendritic boundaries during weld solidification tends to stabilize the austenite and suppress martensite formation in these regions. As a result, fracture occurs preferentially along these boundaries in the Mn-modified weld deposits, giving rise to the “corduroy” fracture morphology and providing less resistance to fracture than in weld deposits where martensite formation is more homogeneous. |
| Databáze: | OpenAIRE |
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