Modeling of precipitation hardening during the aging and overaging of 18Ni-Co-Mo-Ti maraging 300 steel

被引：84

作者：

Pardal, JM

Tavares, SSM

Terra, VF

Da Silva, MR

Dos Santos, DR

机构：

[1] Univ Fed Fluminense, PGMEC, Dept Engn Mecan, BR-24210240 Niteroi, RJ, Brazil

[2] Univ Fed Itajuba, Inst Ciencias, Itajuba, MG, Brazil

[3] Ctr Tecnol Aeronaut, Sao Jose Dos Campos, Brazil

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2005年 / 393卷 / 1-2期

关键词：

maraging steels; overaging; precipitation hardening;

D O I：

10.1016/j.jallcom.2004.09.049

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The precipitation hardening behavior of an 18Ni-Co-Mo-Ti maraging 300 solution treated and aged in the 440-650 degrees C range was investigated. The aging at 440, 480, 510 and 560 degrees C was modeled by an equation Delta H= (Kt)(n). The activation energy for precipitation was determined (132 kJ/mol) and compared to published values for 18Ni-Co-Mo-Ti maraging 250 and 350 steels. The model for overaging based on the Orowan mechanism was tested in samples treated at 560, 600 and 650 degrees C but was found to be valid only for 560 degrees C. The softening of samples aged at 600 and 650 degrees C is rather due to austenite precipitation than to Ni-3(Mo, Ti) and Fe2Mo coarsening. Equations H=H(1)t(p) were fitted for the overaging at 560, 600 and 650 degrees C. (c) 2004 Elsevier B.V. All rights reserved.

引用

页码：109 / 113

页数：5

共 15 条

[1] MAGNETIC-PROPERTIES OF MARAGING STEELS IN RELATION TO NICKEL CONCENTRATION [J].