Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

Influence of initial heat treatment on the structure and creep resistance of austenitic Fe-Ni alloy

nr katalogowy: 52660

Austenitic Fe-Ni alloys precipitation-strengthened with intermetallic phases of type γ′ (Ni3(Al, Ti)) obtain their optimum properties after multi-stage heat treatment consisting of solution treatment (or annealing) and various ageing variants. Most frequently for such type of alloys, solution heat treatment from a temperature 980÷1010°C and single-stage ageing at temperature of 710÷730°C during 16÷20 h are applied [1÷4]. For some Fe-Ni alloys after solution, it is recommended to apply two-stage ageing, which consists of carrying out a controlled cooling cycle between two isothermal soaking processes [5, 6]. In the presented paper, investigation was initiated concerning the effect of initial heat treatment on the structure, mechanical properties and creep resistance of an austenitic Fe-Ni alloy precipitationstrengthened with an intermetallic phase of the γ′ type. MATERIAL AND PROCEDURE The examinations were performed on rolled bars, 16 mm in diameter, of an austenitic Fe-Ni alloy of A-286 type. The chemical composition of the material is given in Table 1. Specimens of Fe-Ni alloy were subjected to tests after two variants of heat treatment, i.e. solution heat treatment and single-stage ageing and solution heat treatment followed by two-stage ageing. Parameters of heat treatment for the investigated Fe-Ni alloy were determined based on previously carried out studies [7, 8]. For the investigated alloy after solution heat treatment in the conditions 980°C/2 h/water, two variants of specimens ageing were used for comparison, i.e.: -- single-stage ageing (variant A): 715°C/16 h/air, -- two-stage ageing (variant B) : 720°C/8 h + cooling in the furnace up to a temperature of 650°C + 650°C/8 h/air. A schematic course of heat treatment of specimens made of the investigated alloy is presented in Figure 1. A static tensile test was carried out using a strength testing machine MTS-810. The examinations were carried [...]

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