淬火内应力

7075铝合金模锻件淬火残余内应力的消除

Elimination of residual stress of 7075 Al alloy die forging product

采用增加辅助淬硬区和调整淬硬层深度的方法，使工件淬火后内应力分布平衡，达到了淬硬和控制变形的目的。

Workpiece hardening and deformation controlling are realized by enhancing axiliary hardening area and changing hardened depth that can ballance the stress distribution in hardened workpiece .

本文通过对大量东方红75（54）拖拉机汽缸套实样的观察、分析和比较，认为淬火裂纹是内应力瞬时超过材料强度极限时所产生的一种脆性断裂。

The experimental result show that the producing of the quenching crack is as a result of inside stress exceed the limiting strength of material for an instant .

结果表明，淬火过程产生的内应力促进马氏体相变，在马氏体相变的情况下，组织应力强于热应力，使淬火后工件的残余应力呈组织应力分布。

The results showed that the internal stress produced in quenching process promoted martensite transformation , in martensite phase transformation conditions the structure stress surpassed thermal stress led to residual stress in quenched piece presented structure stress distribution .