Would flak fragments melt before striking a hypersonic vehicle?

Would a flak fragment spend long enough in the plasma to melt before hitting a hypersonic vehicle?

The exchange leaves the timing question unresolved. It raises temperature dependence and possible flow disruption even if a fragment loses its integrity.

The follow-up challenges whether a fragment would remain inside the hot flow long enough to melt before impact. The reply leaves the result dependent on temperature without calculating exposure time. Another participant suggests that even damaged or dispersed material could disturb the flow conditions around the nose. A resulting effect on reliability or survivability is presented as possible, without a demonstrated result.