Example 13

The effect of normal annealing and stress annealing on nitriding an iron-based material was evaluated. FIGS. 19A and 19B are diagrams illustrating XRD spectra of example iron nitride compositions with normal annealing and with stress annealing, respectively. The intensity of Fe16N2 phase was observed to enhance by strained workpiece annealing. The workpiece was subject to tensile stresses of up to 800 MPa at temperatures of 160° C. to 200° C.

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