随行走速度提高，钢的硬化层厚度减小，硬度提高。
With increasing travel speed, the hardened depth decreased and the hardness increased.
这些相变在技术上得到广泛应用，从钢的硬化到制造形状记忆合金都有应用。
Martensitic transformations can be irreversible, as seen in steels upon quenching, or they can be reversible, such as those observed in shape-memory alloys.
使用自制的大功率半导体激光器对U 74轨钢进行了相变硬化。
Laser transformation hardening was carried out on U74 rail steel by a self-developed high power diode laser.
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