| 摘要 |
<p>Improved nickel base alloys for use in vacuum directional solidification casting which alloys include a plurality of elements but which, in particular, include the following elements in the percentages by weight specified: carbon .07-.09, zirconium .007-.015, tungsten 9.3-9,7, and molybdenum 0.4-0.6. The new ultra high strength casting alloys are free of the problem of grain boundary cracking which has been encountered in the production of directional solidification castings of this type of alloy and minimize M6C acicular phase formation in turbine blades under high temperature conditions over extended operating periods. The invention also includes a turbine engine blade cast from the alloy.</p> |
