Iron-base shape memory alloy locked key and its manufacturing and using method

Abstract

The invention relates to a Fe-based shape memory alloy insert for repairing cracks, splits, damages, holes and other defects of mechanical members, and the manufacturing method and application thereof. The chemical components of the Fe-based shape memory alloy insert (mass percentage) are as follows: Si 3.0-6.0, Mn 4.0-30.0, Cr 0-18.0, Zr 0-5.0, Nb 0-6.0, Ti 0- 5.0, V 0-5.0, C 0.01-0.20, and Fe and impurity in balance. The insert is prepared by smelting in a vacuum induction smelting furnace and stretching at room temperature. The inserts each contracts to apply a tension force on the matrix at two sides of the inserts, thereby closing the crack and split. The invention has the advantages of simple and feasible process, steady action, uniform stress on each insert, and no risk of relaxation and leakage at high temperature.

Description

technical field [0001] The invention relates to an iron-based shape-memory alloy fastening key for repairing cracks, cracks, damage, holes and other defects of machine parts and its manufacturing and using methods. Background technique [0002] Uneven force and heating of large parts during use, defects in the manufacturing process, and residual stress will cause problems such as cracks, cracks, and damage to the parts. For important parts, if they are damaged, if they are replaced with new ones, it is not only expensive, but also takes a long time from ordering, transportation to installation and debugging, which will affect the use of equipment for a long time and cause economic losses. However, using appropriate technology to repair the damaged parts in a short time will avoid the loss caused by the long repair period. At present, the metal fastening process is widely used in the repair of medium and large parts, because of the large volume of medium and large parts, the...

AI Technical Summary

Problems solved by technology

[0004] At present, the metal keys used in the metal buckle legal repair process need to be pressed in one by one, which is time-consuming and laborious; the repair effect will vary greatly due to the different technical levels of the operators, and it is difficult to master mature technical methods. ; Metal fastening generally requires multiple fastening keys, and the stress of each key is uneven; in addition, using ordinary fastening keys to repair cracks and cracks, there is a problem of cracks and cracks re-generating leakage at high temperatures; in order to solve For the problem of high temperature leakage, the more expensive Invar alloy buckle key with a thermal expansion coefficient less than or equal to cast iron is generally used, and the economic cost is relatively high

Images