hardening and tempering

The mechanical properties of oil hardening and tempering spring wire were introducer in this paper, The process and system constitutes for spring wire with induction heating were proposed, The operation principle of this system was also discussed.

介绍了油回火弹簧钢丝的力学性能，给出了油回火弹簧钢丝感应加热生产工艺流程及系统组成，简述了系统各部分的技术功能及特点。

The line has perfect performances and is widely used for hardening and tempering bearing parts.

该生产线消化吸收国外先进技术,性能优越,主要用于轴承零件的淬、回火.

Then hardness of coatings and substrate was measured. By means of bend-rotation fatigue tests, fatigue strength of coating and uncoating specimens was compared after hardening and tempering.

然后测量涂层和基体的硬度，并通过采用旋转弯曲疲劳试验比较涂层试样与未涂层试样的疲劳强度。

By means of bend-rotation fatigue test, the fatigue strength of Ni based alloy-WC composite coating and uncoatings specimens were compared after hardening and tempering.

通过旋转弯曲疲劳试验，比较涂层试样与未涂层试样在调质处理后的疲劳强度。

Hardness and strength of the substrate of vacuum melting Ni based alloy-WC composite coating is low. After hardening and tempering, hardness and strength of the substrate was increased.

经过真空熔烧Ni基合金+WC复合涂层的45钢基体的硬度和强度都很低，为了提高基体的硬度，对涂层后的材料进行调质处理。

Mechanical properties of three after-forged heat treatment samples are all meet or exceed the demands of performance index after hardening and tempering.

三种热处理工艺调制后的试样力学性能均达到或超过生产指标要求。

Based on the basic mechanical theory and practice, and on the needs in the performance of petroleum mechanical products used in oil recovery, we raise a method to cool the long metal tube evenly after the hardening and tempering.

根据石油开采业对石油机械产品的需求，利用机械理论基础知识，通过实践设计，提出了对几何尺寸长的金属管类进行调质处理后的均匀冷却方法，以满足其性能要求。

This paper analyzes the problems existing hardening and tempering process of the large draw bar.

该文分析了大型拉杆调质工艺存在的问题.

In diffusion layer , cracks were found after hardening and tempering.

调质使得扩散层产生裂纹.