Process for improving heat treatment hardenability of wind power main shaft

By optimizing the forging process and heat treatment parameters, and combining dual-medium quenching and segmented controlled cooling processes, the problem of uneven microstructure between the core and surface layers of large wind turbine main shafts was solved, thereby improving the uniformity of hardness fluctuations and reliability.

CN122168859APending Publication Date: 2026-06-09JIANGYIN ZENKUNG FORGING CO LTD
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Patent Information

Application Number
CN202610249865.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-03
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing technologies make it difficult to achieve uniformity of the core and surface microstructure properties in large wind turbine main shafts, resulting in insufficient hardenability and affecting reliability and service life.

Method used

By employing precise control of forging process and heat treatment parameters, combined with density-layered dual-medium system quenching and segmented heating and cooling process, the alloy composition and forging ratio of 42CrMo4 steel ingot are optimized. The grains are refined through alternating upsetting and drawing processes, and the precipitation and distribution of carbides are controlled during the tempering stage.

Benefits of technology

It achieves uniformity of hardness fluctuation between the core and surface of the wind turbine main shaft within ±5HB range, improves hardenability and reliability, and meets the long-term service requirements of high-power wind power equipment.

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Abstract

The invention discloses a process for improving the heat treatment hardenability of a wind power main shaft, which comprises the following steps: heating a 42CrMo4 steel ingot to 1180-1220 DEG C, and forging according to the forging ratio of more than or equal to 4; the forge piece is charged when air-cooled to 650-700 DEG C for the first time, the forge piece is heated to 640-660 DEG C after being subjected to heat preservation at 300-350 DEG C, heat preservation is conducted for the second time, the heat preservation time is determined according to the effective thickness * 1.5 min / mm, and then the forge piece is cooled to the room temperature; the forge piece is vertically loaded into a tool, heated to 840-860 DEG C and subjected to heat preservation, the heat preservation time is calculated according to the effective thickness * 1.2-1.5 min / mm, and when the surface temperature is reduced to 780-800 DEG C, the forge piece is quenched into a PAG solution; after quenching, transferring to a tempering furnace within 3 minutes, raising the temperature to 300 DEG C at the speed of less than or equal to 80 DEG C / h, preserving heat, raising the temperature to 540-580 DEG C at the speed of less than or equal to 100 DEG C / h, preserving heat, calculating the heat preservation time according to effective thickness * 2.0-2.5 min / mm, and cooling at the speed of less than or equal to 50 DEG C / h after tempering. According to the method, grains and carbides are refined through the forging, upsetting and drawing process, the size of pearlite clusters is controlled in combination with normalizing, and the cooling uniformity is improved by adopting a density layered double-medium system in the quenching link, so that the method is suitable for improving the large-section hardenability of the high-power wind power main shaft.
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