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51313-02484-Restoration of Precipitation Strengthened Steel Properties as Part of the Field Repair

Product Number: 51313-02484-SG
ISBN: 02484 2013 CP
Author: Alex Nadezhdin
Publication Date: 2013
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$20.00
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The precipitation strengthened martensitic stainless steel has been the material of choice for a continuous steel belt used in panel-board pressing. By being subjected to periodic denting with ensuing fatigue cracking it must be repaired in the field in order to avoid costly and time-consuming shutdowns needed to replace the belt. The welding repair process no matter how carefully it is conducted subjects the surrounding base metal to temperatures at which the crystalline phase reinforcement reverts back to a solid solution leaving it in the annealed i.e. low hardness/strength condition. This loss of strength makes the repaired area more prone to denting and fatigue cracking than the rest of the steel belt causing subsequent failures in the repaired area. The paper describes lab experiments and field application of an optimized heat treatment to the repaired spot aimed at restoring its original strength
 

The precipitation strengthened martensitic stainless steel has been the material of choice for a continuous steel belt used in panel-board pressing. By being subjected to periodic denting with ensuing fatigue cracking it must be repaired in the field in order to avoid costly and time-consuming shutdowns needed to replace the belt. The welding repair process no matter how carefully it is conducted subjects the surrounding base metal to temperatures at which the crystalline phase reinforcement reverts back to a solid solution leaving it in the annealed i.e. low hardness/strength condition. This loss of strength makes the repaired area more prone to denting and fatigue cracking than the rest of the steel belt causing subsequent failures in the repaired area. The paper describes lab experiments and field application of an optimized heat treatment to the repaired spot aimed at restoring its original strength
 

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