SEDL / STP / STP1270-EB / STP16504S

The Microstructural Stability and Mechanical Properties of Two Low Activation Martensitic Steels

Victoria, M
CRPP-Fusion Technology Materials, école Polytechnique Fédérale de Lausanne, Villigen, PSI

Batawi, E
Materials and Surface Engineering, Sulzer Innotec, Winterthur,

Briguet, C
école Polytechnique Fédérale de Lausanne, Lausanne,

Gavillet, D
Laboratory for Materials Behaviour, Paul Scherrer Institut, Villigen, PSI

Marmy, P
CRPP-Fusion Technology Materials, école Polytechnique Fédérale de Lausanne, Villigen, PSI

Peters, J
Materials and Surface Engineering, Sulzer Innotec, Winterthur,

Rézai-Aria, F
école Polytechnique Fédérale de Lausanne, Lausanne,

Pages: 18    Published: Jan 1996

Download this paper for $25 PDF (436K)          View License Agreement
Abstract

A low activation composition of a martensitic 9 % Cr steel has been studied, based on the DIN (Deutsches Institiit für Normung) 1.4914 composition (MANET) but replacing Ni, Mo and Nb by the low activation elements W, V and Ta. Two casts were produced from high purity components, in which the effects of controlled additions of Mn (0.58 and 0.055 wt. %) and N (7 and 290 wt. ppm) were studied, so that the final compositions resulted in one cast with high Mn and low N (steel A) and the other with the opposite conditions (steel B). The two steels were evaluated in terms of structural stability and mechanical properties under tensile, fatigue and fracture toughness tests.

It has been found that both alloys have a DBTT below room temperature, which in the case of the steel A is 70 K below that of MANET. Although the tensile strength is somewhat below that of the parent steel, both steels have longer fatigue life.