A method for manufacturing a component of a single crystal or a directionally solidified material, said component being manufactured having a predefined shape, comprising at least the following steps: - superimposing at least a powder layer of a powder of a first material onto at least a surface of a substrate out of a second, single crystal or directionally solidified, material; - transforming the powder layer into a substrate layer with a new surface of the substrate by altering at least a physical condition of the first material of the powder by applying energy to the powder layer; wherein said substrate layer is becoming a part of the substrate; wherein the second, single crystal or directionally solidified, material of the substrate has a grain orientation and the material of the substrate layer has a grain orientation; wherein the material of the substrate layer adopts the same grain orientation as the grain orientation of the substrate during the transforming process; - detecting the grain orientation (24, 36) of the material of the substrate layer in situ and when the grain orientation of the material of at least a section of the substrate layer is different from the grain orientation of the substrate, said section of the substrate layer is transformed by altering a physical condition of the material of the section by applying energy to correct the grain orientation of the section of the substrate layer, wherein applying energy is by a low focus beam used to execute an in situ heat treatment process that is an ageing or an annealing process; and wherein the steps are repeated till the component has grown layer by layer into the predefined shape while a process temperature (T p) is maintained below a melting temperature (T m) of at least the first material and the component has been manufactured thereby. - superimposing at least a powder layer of a powder of a first material onto at least a surface of a substrate out of a second, single crystal or directionally solidified, material; - transforming the powder layer into a substrate layer with a new surface of the substrate by altering at least a physical condition of the first material of the powder by applying energy to the powder layer; wherein said substrate layer is becoming a part of the substrate; wherein the second, single crystal or directionally solidified, material of the substrate has a grain orientation and the material of the substrate layer has a grain orientation; wherein the material of the substrate layer adopts the same grain orientation as the grain orientation of the substrate during the transforming process; - detecting the grain orientation (24, 36) of the material of the substrate layer in situ and when the grain orientation of the material of at least a section of the substrate layer is different from the grain orientation of the substrate, said section of the substrate layer is transformed by altering a physical condition of the material of the section by applying energy to correct the grain orientation of the section of the substrate layer, wherein applying energy is by a low focus beam used to execute an in situ heat treatment process that is an ageing or an annealing process; and