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HIPing Brings New Horizons for Casting Manufacturers

Publisher: Kittyhawk Products
Overview:
This paper describes a short programme of work to demonstrate that the exposure of castings to Hot Isostatic Processing(HIP)treatments can develop properties equal to those expected from wrought materials. The impact of HIP on carbon and alloy steels in increasing the endurance power of the alloys and in influencing a change in their mechanical properties are examined in detail. Hot Isostatic Processing of low alloy steels and the three part programme like process optimization, cast and wrought comparisons for En 40B, and cast and wrought comparisons for En 24 are outlined. The report further explains the effects of HIP on cast materials in influencing extensive homogenization and increasing the fatigue capability. Data presented in this paper appears to suggest that improved mechanical properties in alloy steels can reach new horizons by the application of a HIP treatment. It includes tables to present the actual compositions of test bars used within present study, and the optimization of mechanical properties for cast En 40B using various HIP parameters.
TABLE OF CONTENTS
1.Carbon and alloy steels2-3
2.Hipping of low alloy steels3-4
2.1Part I - Process optimization3-4
2.2Part 2 - Cast and wrought comparisons for En 40B4
2.3Part 3 - Cast and wrought comparisons for En 244
3.Effects of hip - further analysis4-6
3.1Homogenisation5
3.2Fatigue behaviour5
3.3New horizons5-6
4.Tables
4.1Steel composition isolated for evaluation6
4.2Actual compositions of test bars used within present study6
4.3Optimisation of mechanical properties for cast En 40B using various HIP parameters6
4.3.1Summary of improvements in elongation and impact properties7
5.Figures
5.1Cutaway view of an ASEA hot isostatic press. Components to be
processed are placed within the central core and enclosed within the
heater/insulation package1
5.2.1Radiographs showing the effect of HIP upon macro-sized voids within carbon stell san-cast test bar.2
5.2.2Radiographs showing the effect of HIP upon macro-sized voids within a sand-cast carbon steel valve body.2
5.3.1Investment-cast niobium-stablished 316 stainless steel. As - cast condition2
5.3.2Investment-cast niobium- stablished 316 stainless steel. Cast + HIP2
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