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Title: Isothermal formation of martensite in a 12Cr-9Ni-4Mo maraging stainless steel

Abstract

The present paper is concerned with the nature of the martensite, which provides the basis for the maraging treatment. Rather than forming martensite during cooling, 1RK91 develops martensite when held at a constant temperature in a range from room temperature and below. Isothermal martensite formation showing C-curve kinetics was found to occur in the maraging steel 1RK91, the nose temperature being about {minus}40 C. The kinetics was found to be enhanced for higher austenitizing treatment temperatures, presumably through a combination of larger grain size and a larger number of quenched in nuclei for isothermal martensite transformation. Experiments involving different cooling rates showed that fast cooling enhanced the transformation kinetics. Based on this observation it is suggested that quenched-in vacancy clusters provide suitable strain embryos for isothermal martensite nucleation.

Authors:
 [1]
  1. AB Sandvik Steel, Sandviken (Sweden)
Publication Date:
OSTI Identifier:
116062
Resource Type:
Journal Article
Journal Name:
Scripta Metallurgica et Materialia
Additional Journal Information:
Journal Volume: 33; Journal Issue: 9; Other Information: PBD: 1 Nov 1995
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; IRON BASE ALLOYS; CRYSTAL-PHASE TRANSFORMATIONS; CHROMIUM ALLOYS; NICKEL ALLOYS; MOLYBDENUM ALLOYS; TEMPERATURE DEPENDENCE; GRAIN SIZE; VACANCIES; QUENCHING; NUCLEATION; KINETICS

Citation Formats

Holmquist, M. Isothermal formation of martensite in a 12Cr-9Ni-4Mo maraging stainless steel. United States: N. p., 1995. Web. doi:10.1016/0956-716X(95)00386-A.
Holmquist, M. Isothermal formation of martensite in a 12Cr-9Ni-4Mo maraging stainless steel. United States. https://doi.org/10.1016/0956-716X(95)00386-A
Holmquist, M. 1995. "Isothermal formation of martensite in a 12Cr-9Ni-4Mo maraging stainless steel". United States. https://doi.org/10.1016/0956-716X(95)00386-A.
@article{osti_116062,
title = {Isothermal formation of martensite in a 12Cr-9Ni-4Mo maraging stainless steel},
author = {Holmquist, M},
abstractNote = {The present paper is concerned with the nature of the martensite, which provides the basis for the maraging treatment. Rather than forming martensite during cooling, 1RK91 develops martensite when held at a constant temperature in a range from room temperature and below. Isothermal martensite formation showing C-curve kinetics was found to occur in the maraging steel 1RK91, the nose temperature being about {minus}40 C. The kinetics was found to be enhanced for higher austenitizing treatment temperatures, presumably through a combination of larger grain size and a larger number of quenched in nuclei for isothermal martensite transformation. Experiments involving different cooling rates showed that fast cooling enhanced the transformation kinetics. Based on this observation it is suggested that quenched-in vacancy clusters provide suitable strain embryos for isothermal martensite nucleation.},
doi = {10.1016/0956-716X(95)00386-A},
url = {https://www.osti.gov/biblio/116062}, journal = {Scripta Metallurgica et Materialia},
number = 9,
volume = 33,
place = {United States},
year = {Wed Nov 01 00:00:00 EST 1995},
month = {Wed Nov 01 00:00:00 EST 1995}
}