Premium
Einfluss der Auslagerungstemperatur auf den Restaustenitgehalt in dem rostfreien Stahl X5CrNiCuNb 16‐4
Author(s) -
Burja J.,
Šuler B.,
Nagode A.
Publication year - 2019
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201800045
Subject(s) - austenite , materials science , metallurgy , microstructure , dilatometer , alloy , martensite , precipitation , copper , transmission electron microscopy , precipitation hardening , drop (telecommunication) , thermal expansion , telecommunications , physics , meteorology , computer science , nanotechnology
The alloy AISI 630 (ASTM A564‐89 17‐4 PH) is a precipitation hardening stainless steel with good mechanical and corrosion properties. Mechanical properties strongly depend on the microstructure. Namely, the formation of the reversed austenite and coarsening of copper rich precipitates cause a substantial drop of hardness. Thus, the evolution of the microstructure during ageing was thoroughly investigated in order to explain the processes that have effect on formation of the reversed autenite. The reaustenitization was analyzed with a dilatometer, while the coarsening of copper rich precipitates was observed by transmission electron microscope. The amount of austenite was measured with x‐ray diffraction and the impact of austenite on the fracture appearance transition temperature was observed. It was found that the amount of the so called reverse austenite does not only depend on the amount of transformed austenite but also on its chemistry, as it dictates its ability to transform into martensite during cooling.