同时表面硬度高，经热处理后，其镀层表面形成非晶态和晶态的混合物时，硬度可达1200 HV。
Meanwhile, high surface hardness after heat treatment, the coating surface formed into the amorphous and crystalline mixture, the hardness is up to 1200hv.
热处理后，材料的硬度和强度均有提高，但冲击韧度下降。
Through heat treatment, material hardness and strength increase, but impact toughness decreases.
本文研究了45钢抽油泵缸套激光热处理后的显微组织和硬度的变化。
Treated with laser the changes in microstructure and hardness of cylinder sleeve of oil-well pump for 45 steel were studied.
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