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.
钢的热处理工序包括硬化、回火、退火和表面硬化。
The procedures of heat treatment of steel include hardening tempering annealing and case hardening.
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