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The influence of surface treatment on the risks of delayed fracture in high-strength cold headed bolts

The influence of surface treatment on the risks of delayed fracture in high-strength cold headed bolts

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One way to reduce the risk of delayed fracture in cold-headed high-strength bolts is to limit the penetration of hydrogen into the steel. The authors observed that the highest level of hydrogen insid ...
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$15.00 - Tech. Paper #P05266 (List Price)

$0.00 - Tech. Paper #P05266 (Member Price)

Number of pages:4
Year published:2007
Weight:0.2500
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By Bernard Resiak and Mario Confente, Mittal Steel Europe Research Center, and René Cathiard, Pierre Perrin, and Bernard Starck, LISI Automotive, France
2007
 
One way to reduce the risk of delayed fracture in cold-headed high-strength bolts is to limit the penetration of hydrogen into the steel. The authors observed that the highest level of hydrogen inside the steel occurs during the austenitizing treatment, due to the temperature and atmosphere of the furnace. This study confirmed that the presence of phosphate on the surface of the steel can result in the penetration of phosphorus during the heat treatment process, thus leading to embrittlement.
  
 
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