Accession Number:

ADA133428

Title:

A Metallographic Interpretation of the QLT Heat Treatment of Ferritic Cryogenic Steels.

Descriptive Note:

Technical rept.,

Corporate Author:

CALIFORNIA UNIV BERKELEY DEPT OF MATERIALS SCIENCE AND MINERAL ENGINEERING

Personal Author(s):

Report Date:

1982-05-01

Pagination or Media Count:

11.0

Abstract:

Commercial 5-6Ni steels are toughened for service by a 3-step heat treatment which is sometimes designated the QLT treatment. The present investigation was undertaken to determine why this treatment is necessary and successful. It was concluded that the multi-step heat treatment is necessary because of the low nickel content. The intercritical anneal L serves to create regions of high solute contents along the martensite lath boundaries. The intercritical temper T then precipitates a dense distribution of high solute, stable austenite within these enriched regions.

Subject Categories:

  • Properties of Metals and Alloys
  • Fabrication Metallurgy
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE