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SUNBAY MACHANICAL Co., Ltd.
 
email : sunbay168@gmail.com
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Category: 加工程序的影響

 

Plating 電鍍加工對應力的影響

 
 

電鍍的疲勞缺陷可能是由脆性表面的微裂紋、氫脆或殘餘拉應力所引起，電鍍層中的微裂紋能快速的增生及繁殖到基材中並導致破壞的提早發生，所以許多金屬零件在鍍鉻和鍍鎳之前被要求進行珠擊處理，以消除電鍍層對零件疲勞壽命有害的影響。尤其是在有循環負載的零件上，建議在電鍍前進行珠擊處理，以提高疲勞性能。

電鍍操作之前對母材進行珠擊處理來防止氫脆。由於原子氫的流動性極強，很容易滲透金屬並與金屬相互作用，因此珠擊處理會降低金屬的延展性和承受循環負荷的能力。珠擊處理已被證明可以有效地阻止氫氣經由金屬的遷移。

對於在動態載荷下需要無限壽命的零件，美國聯邦規範 QQ-C-320和 MIL-C-26074要求在鍍鉻或化學鍍鎳之前對鋼件進行珠擊處理來增加金屬的疲勞強度。對於其他硬質的電鍍程序如電解鎳也可提升疲勞強度。

  
模擬在多重系統中不同電鍍層中裂紋的繁殖
珠擊減緩氫的遷移
  
 

金屬零件經由珠擊處理後在零件的表面上形成一個壓縮應力層，此壓縮應力不僅抵抗了電鍍層微裂縫的傳播，同時也可阻止零件材料本身微裂縫的增生及繁殖，對於零件的在使用上不會提早的失效。

  
珠擊增了電鍍的抗疲勞強度
 
 
Effect of a Shot Peening Pre Treatment on the Fatigue Behaviour of Hard Chromium on Electroless Nickel Interlayer Coated AISI 4340 Aeronautical Steel  
珠擊引起的壓縮應力阻止了裂縫的繁殖

 

 
 
 
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