Effect of Solute Additions on the Swelling of an Fe--7.5 Cr--20 Ni Alloy

摘要

The influence of various solute elements on the swelling behavior of an Fe-7.5 Cr-20 Ni alloy in the range 500 to 730 exp 0 C has been investigated using 4 MeV nickel ion bombardment. It was found that on an atomic percent basis, the elements may be arranged in order of decreasing effectiveness in reducing peak temperature swelling as follows: Ti, C, Nb, Si, and Mo. Small additions of aluminum enhance swelling. Additions of Si, Ti, or Nb truncate the high temperature swelling regime of the ternary alloy. Molybdenum, tungsten, and carbon do not have a strong effect on the temperature dependence of swelling. The results may be interpreted in terms of the effect of point defect trapping on void growth rates, and it is suggested that the changes in peak temperature are the result of small changes in the free vacancy formation energy. (ERA citation 02:060408)