Heat treatment method capable of realizing both precipitation strengthening and lower bainite phase-transformation strengthening
A heat treatment method and precipitation strengthening technology, which is applied in the field of heat treatment that takes into account both precipitation strengthening and lower bainite transformation strengthening, and can solve the problems that precipitation strengthening and lower bainite strengthening cannot be solved
Active Publication Date: 2020-11-03
JIANGSU UNIV
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Abstract
The invention provides a heat treatment method capable of realizing both precipitation strengthening and lower bainite phase-transformation strengthening, and belongs to the technical field of heat treatment of alloy materials. The heat treatment method provided by the invention comprises the following steps that an iron-based alloy is heated to an austenite phase interval for first heat preservation, then cooled to the martensitic transformation temperature for second heat preservation, then heated up to the temperature interval where precipitation strengthening can be generated for third heat preservation, finally cooled into the temperature range of a lower bainite phase-transformation temperature interval for fourth heat preservation, and then cooled to the room temperature. The methodprocess of pre-quenching, tempering and lower bainite transformation is adopted, and precipitation strengthening, lower bainite phase-transformation strengthening and multi-phase (lower bainite and martensite) fine-grained strengthening are utilized to improve the strength and impact absorption energy of materials. The result of the embodiment shows that the hardness of the iron-based alloy prepared by the heat treatment method provided by the invention is greater than or equal to 56 HRC, and the impact absorption energy Aku of the iron-based alloy is greater than or equal to 28 J.
Technology Topic
PhysicsHeat conservation +7
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PUM
Property | Measurement | Unit |
Impact absorption energy | 30.0 | J |
Impact absorption energy | 28.0 | J |
Impact absorption energy | 14.0 | J |
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