Reproducibility of small-strain creep tests of Ti 6242Si

• Published in: Journal of materials engineering and performance Vol. 3; no. 6; pp. 722 - 725
• Main Authors: DELOS-REYES, M. A, KASSNER, M. E
• Format: Journal Article
• Language: English
• Published: New York, NY Springer 01.12.1994; Springer Nature B.V
• Subjects: Applied sciences; Condensed matter: structure, mechanical and thermal properties; Creep; Exact sciences and technology; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Metals. Metallurgy; Physics; Creep; Creep test; Mechanical properties; Creep strength; Plastic deformation; Mechanical tests; Experimental study; Titanium base alloys; Tin alloys; Aluminium alloys; Microstructure; Molybdenum alloys; Zirconium alloys
• ISSN: 1059-9495; 1544-1024
• DOI: 10.1007/BF02818371

Titanium 6242Si was creep tested at 510 deg C and 241 MPa to plastic strains of approx0.002. These conditions are common in commercial specifications for acceptance of this alloy. Nineteen specimens were extracted from four identically thermally and mechanically processed coupons from the same ingot and creep tested. The results indicate relatively poor reproducibility despite essentially identical sample preparation and specimen testing procedures. The causes of the scatter are unclear. The average creep strain of the 19 specimens after 35 h was 0.067%, and the standard deviation was 0.0367%. Significant scatter is also evident among the average properties of the four coupons. The results suggest that impurity levels and processing procedures may require adjustments to ensure relatively low expected or "average" creep strain levels (half the allowable) in some common acceptance specifications to ensure a high probability of acceptance.