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Abstract Aging treatment is performed for microalloyed steel for cold hardening bolt, which can stabilize its microstructure, enhance its strength and reduce its residual stress. A series of process tests are implemented for studying aging rules by means of heating device of heat treatment, and effects of aging processes on microstructures and properties for materials are analyzed by using optical microscope, scanning electron microscope and tensile tester and so on. The results show that hardness is increased by both raising temperature and delaying aging time, 250~300℃ and 2.5 hours are served as best aging processes to meet manufacture, moreover, aging processes and surface treatment technique may simultaneously be carried out. Additionally,sub-grain boundary,Cottrell atmosphere and dispersion Carbide -nitride are precipitated in the ferrite grain, which mainly results in aging strength.
Key words: aging processes; deformation strengthening; bolt; microstructures; properties
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Received: 22 June 2009
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