A Study of Precipitation and Segregation on an Atomic Scale of 11at.%Cr-lat.%Mo Heat Resisting Steel by Atom-Probe and TEM (Transmission Electron Microscope).

Abstract

An 11at.%Cr-lat%Mo commercial steel which contain C, Si, Mn, Nb and V as minor elements was investigated by atom-probe (AP) and transmission electron microscopy (TEM). This steel has an excellent heat resisting property at 600 - 650 C but undergoes the ductile - brittle transition in this temperature range. The following results were obtained: 1) After solution treatment the FIM image was homogenous on an atomic scale. 2) After tempering at 650 C for 1 hr a precipitate was detected. AP analysis showed tht her precipitate was M(C+N) where M is Nb, Cr, V, Mo and Fe. 3) After tempering at 700 C for 1 hr, a precipitate with a Fe/Cr ratio of 60/40 (sigma phase) was also observed at the lath boundary, and adjacent to this region the chromium concentration decreased to 1%.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1985
Accession Number
ADA161590

Entities

People

  • N. Igata
  • S. Sato
  • T. Ando
  • T. Hashizume
  • T. Sakurai

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Chemical Analysis
  • Chemical Compounds
  • Chemistry
  • Earth Sciences
  • Engineered Materials
  • Engineering
  • Geography
  • Materials
  • Materials Engineering
  • Materials Science
  • Mechanics
  • Military Research
  • Mining Engineering
  • Physics Laboratories
  • Precipitation
  • Solid State Physics
  • Universities

Fields of Study

  • Materials science

Readers

  • Metallurgy
  • Powder metallurgy of Titanium alloys.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene