硬度梯度 meaning in Chinese

hardness gradient

The reasons why surface of workpiece is moistened from bottom to top in quenching and axial hardness gradient is generated after quenching are also given in this paper
对试验中所观察到的工件表面由底部向顶部逐渐润湿的现象，以及淬火后工件产生轴向硬度梯度的原因进行了解释。
Test results show that the formation of protective nut by laser welding have narrow heat affect zone and minimum organization grow up inclination , gentle hardness gradient , and the protective cover is nearly not out of shape
研究结果表明，防护螺母激光焊接成形具有最窄的热影响区和最小的组织长大倾向，硬度梯度平缓，且防护罩几乎没有变形。