 The efficacy of inclusions as nucleation sites in modern low alloy steel weld metals is such that fine-scale intragranular bainite can nucleate on them, both by continuous cooling and by isothermal transformation below the bainite start temperature.Some confusion has arisen in the literature, as this fine-scale intragranular bainite, which can resemble acicular ferrite in appearance in the optical microscope, has been called acicular ferrite by some researchers.See, for example.