It is pointed out that laser phase transformation hardening can be controlled by altering the heat transfer boundary conditions, i.e.altering cooling velocity. 提出通过改变边界换热条件,从而改变冷却速度,达到控制激光相变硬化。
The grain refining and the hardening effect are mostly affected by the rotate speed and the flux of cooling water. 试件的旋转转速和冷却速度对变形区晶粒细化和硬化效果影响显著;
The Hardening case depth and hardness curve can be changed by adjusting heating time, heating power and cooling speed during induction hardening. 在感应淬火中,通过改变加热时间、加热功率和冷却速度可以改变淬硬层深度和硬度梯度。
The hardening of the workpiece, s surface and the depth of the hardening layer can be ensured, and the deformities and the cracks due to quenching stress can be decreased by improving cooling equipments and increasing cooling intensity of oils. 通过改进冷却设施和提高油的冷却强度,既保证淬火时工件表面淬硬和淬透层深度,又尽量减少淬火应力所造成的变形或开裂。