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5%. 15) and although the data are not extensive the variability is small and comparable to that observed in low-cycle fatigue testing2. The effects of increased maximum cycle temperature and of hold times of five minutes at 1000 C and 1050 C are shown in Figure 7 and due to the restricted nature of the test program only two testpieces were available for each condition. However, it is evident that, with the exception of one result, increased maximum temperature and a hold-time of five minutes in the cycle reduced the number of cycles to failure.

Experimental Materials and Testpieces The CMSX-4 alloy used in the test program was cast by Howmet Corporation as single crystal testpiece blanks with a crystal orientation nominally in the [001] direction along the axis of the bar. All testpiece blanks were heat treated in the standard "step-wise" procedure up to 1140 C and in all cases a “post-coating” heat treatment was performed at 1080 C for 4 h. Subsequently a precipitation heat treatment was carried out in vacuum at 871 C for 20h. Details of the compositions of the alloy and coatings are given in Table 1.

Bernstein, Life Management System for General Electric Frame 7E Gas Turbine, R. Viswanathan and J. M. , eds Life Assessment and Repair Technology for Combustion Turbine Hot Section Components, ASM International, Materials Park, Ohio, 1990, 111-118 5. W. 0 Ni Bal. Bal. Bal. Appendix 1 Figure 1: Picture of CMSX-4 single crystal bars undergoing TMF testing. 13 Appendix 1 Load Load Cell Induction Coil Strain Temperature Controller Servo Controller Cycle Timer Figure 2: Control system used for TMF testing of metallic systems.

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