PBHTPortsmouth Black Heritage Trail (New Hampshire)
PBHTPapillary Bodies of the Human Thalamus
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Figure 3 represents the microstructure of extrados location after applying PBHT 540[degrees]C/30 min.
Figure 4 represents microstructure of the same location after applying PBHT 500[degrees]C/30min where the grain coarsening is less pronounced due to lower temperature.
However, the CSA specification for pipe fittings also requires PBHT for tangent body and weld location.