Testing Machine for Short‐Time Creep and Stress‐Rupture Testing at 2000 to 2500°C

1957 ◽  
Vol 28 (7) ◽  
pp. 543-547 ◽  
Author(s):  
Morton C. Smith ◽  
D. M. Olson ◽  
Harry L. Brown
Keyword(s):  
Testing Machine ◽  
Stress Rupture ◽  
Creep And Stress Rupture ◽  
Short Time ◽  
Stress Rupture Testing

Mechanical Properties, Oxidation Resistance and Their Interaction for Two Gas Turbine Seal Ring Alloys

1992 ◽  
Author(s):  
S. K. Srivastava
Keyword(s):  
Gas Turbine ◽  
Oxidation Resistance ◽  
Stress Rupture ◽  
High Strength ◽  
Low Thermal Expansion ◽  
Static Oxidation ◽  
Long Time ◽  
Short Time ◽  
Stress Rupture Testing ◽  
Invar Type

HAYNES® 242™ alloy is a recently developed Ni-25Mo-8Cr alloy primarily for gas-turbine components requiring a combination of low-thermal expansion and high strength, such as seal rings. INCOLOY® alloy 909 is an iron-base Invar-type alloy used in similar applications. Alloy 909 exhibits substantial advantages over 242 alloy in RT and 650°C (1200°F) - 0.2% yield strength, although at considerable loss of ductility and toughness. In stress-rupture testing over a range of 540°-760°C (1000–1400°F), the 100-hr rupture strengths of alloy 909 are consistently inferior to those of the 242 alloy. This dichotomy in short-time versus long-time tensile properties is likely due to the poor oxidation resistance of alloy 909. Comparative static oxidation and oxidation data concurrent with stress-rupture testing for the two alloys are presented and discussed.

The influence of trace elements on the creep and stress-rupture properties of Nimonic 105

1980 ◽  
Vol 295 (1413) ◽  
pp. 296-296
Keyword(s):  
Trace Elements ◽  
Stress Rupture ◽  
Creep And Stress Rupture ◽  
Close Collaboration ◽  
Pb Stress ◽  
Notched Specimens ◽  
Stress Rupture Properties ◽  
Rupture Properties ◽  
Stress Rupture Testing ◽  
Harmful Effects

The influence of certain trace elements, namely Pb, Sn, Te, Se and Tl, on the creep and stressrupture properties of Nimonic 105 was investigated at 815 °C. The work was supported by the Ministry of Defence, and was planned in close collaboration with Rolls-Royce, who advised, in particular, on the trace elements to be studied and the levels at which harmful effects on creep performance might be expected. The results obtained have confirmed that, with the exception of Sn, all the elements reduce the life to rupture and the ductility at failure when present in sufficient amount. The most deleterious impurities were Te and Pb. Stress-rupture testing with notched specimens gave a generally more sensitive indication of the presence of harmful amounts of impurity than did tests with plain specimens.

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