INVESTIGATION OF SOLIDIFICATION OF HIGH-STRENGTH STEEL CASTINGS

Abstract

The morphology, size and distribution of sulfide inclusions are studied in vacuum melted and solidified AISI 4330 low alloy steel deoxidized with various elements such as Al, Si, Mn, either individually or in various combinations, and B, Zr and Ce. Types 1, 2 and 3 inclusions are investigated in detail. Type 1 inclusions are isolated, roughly spherical sulfides, Type 2 inclusions have an interconnected rod-like morphology, and Type 3 inclusions are angular and unconnected (except they are often connected to Type 2 inclusions). Effects of chemistry (Al, Si, Mn) on inclusion type is quantitatively determined. The effect of cooling rate on inclusion type and size is examined for a few cases. With decreasing cooling rate, the average size of Type 1 inclusions and the average spacing of the eutectic Type 2 inclusions increase.

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Document Details

Document Type
Technical Report
Publication Date
Jul 15, 1968
Accession Number
AD0676235

Entities

People

  • Merton C. Flemings
  • T. Z. Kattamis

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Alloys
  • Boundaries
  • Casting (Fabrication)
  • Castings
  • Cerium
  • Chemistry
  • Engineering
  • Ferrium
  • Iron
  • Manganese
  • Materials
  • Metals
  • Military Research
  • Phase Diagrams
  • Steel
  • Zirconium

Fields of Study

  • Materials science

Readers

  • Metallurgy
  • Powder metallurgy of Titanium alloys.

Technology Areas

  • Space