Influence of Mn and Ni on the microstructure and toughness of C-Mn-Ni weld metals
- Univ. of Southampton (United Kingdom). Dept. of Mechanical Engineering
A systematic investigation has been carried out to study the microstructure and toughness of C-Mn-Ni low-alloy shielded metal arc (SMA) weld metals. The manganese and nickel concentrations were progressively changed to determine their influence on weld microstructure and mechanical properties as well as to identify their interactions. The results obtained showed that manganese and nickel have considerable effect on the weld metal microstructure, and both Mn and Ni affect the microstructure in a similar way, i.e., promoting acicular ferrite at the expense of proeutectoid ferrite (grain boundary ferrite and ferrite sideplates). The results in the top bead also showed that there is an optimum composition range that produces an optimum balance of weld metal microstructures. For optimum toughness, a combination of 0.6--1.4% manganese and 1.0--3.7% nickel is suggested. Additions beyond this limit promotes the formation of martensite and other microstructural features, which may be detrimental to weld metal toughness.
- OSTI ID:
- 500906
- Journal Information:
- Welding Journal, Vol. 76, Issue 5; Other Information: PBD: May 1997
- Country of Publication:
- United States
- Language:
- English
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