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Method for refining grain size of large 1Cr11Ni2W2MoV shaft forge pieces

A 1cr11ni2w2mov, grain size technology, applied in the field of thermal processing of stainless steel alloys, can solve the problems of poor grain size refinement effect and achieve the effect of grain size improvement

Inactive Publication Date: 2016-07-06
SHAANXI HONGYUAN AVIATION FORGING
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in order to solve the problem that the grain size refinement effect of the large-scale 1Cr11Ni2W2MoV shaft forging is poor by using the conventional heat treatment method

Method used

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Embodiment Construction

[0019] The production and development of a certain type of machine shaft forging are selected below to describe the process steps of the present invention in detail.

[0020] The first step: First, heat the Φ280mm 1Cr11Ni2W2MoV bar at 1070°C and then perform upsetting, the deformation is 50%, and the final forging temperature is ≥950°C;

[0021] The second step: After forging, the blank is slowly cooled in air for 3 hours, and then subjected to stress relief annealing at 680°C for 3 hours;

[0022] The third step: normalizing, ≤500℃ into the furnace, heating to 530℃ for 3 hours, then to 760℃ for 2 hours, then to 900℃ for 2 hours, and finally to 1050℃ for 3 hours, air cooling;

[0023] Tempering, 680℃, heat preservation for 7 hours;

[0024] Quenching: ≤500℃ into the furnace, heat up to 530℃ for 3 hours, then to 760℃ for 2 hours, then to 900℃ for 2 hours, finally to 1010℃ for 3 hours, oil cooling;

[0025] Tempering: 680℃, heat preservation for 7 hours.

[0026] After the above three steps...

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Abstract

The invention relates to a method for refining the grain size of a large 1Cr11Ni2W2MoV shaft forging. Usually, after the large-scale shaft forgings of this material are forged, conventional normalizing, tempering, quenching, and tempering heat treatments are performed. The high-magnification grain size generally can only reach the level of 3, while the standard requires 4 or 5 or more. The present invention introduces forging + stress relief annealing (adjusting structure) + typical normalizing and quenching heat treatment system, and the grain size of the structure can be stably reached above grade 5.

Description

Technical field: [0001] The invention belongs to the technical field of hot processing of stainless steel alloys, and relates to a method for refining the grain size of a large 1Cr11Ni2W2MoV shaft forging. Background technique: [0002] 1Cr11Ni2W2MoV steel is a martensitic hot-strength stainless steel, its room temperature tensile strength, endurance strength limit and creep limit are high, and it has good toughness and oxidation resistance. The steel usually contains a small amount of δ-ferrite. When the content is greater than 5%, the transverse mechanical properties (mainly toughness, fatigue properties, creep properties, etc.) deteriorate. The structure after normalizing is pearlite, and the structure after quenching is martensite. 1Cr11Ni2W2MoV steel is suitable for manufacturing load-bearing parts under 550℃ and high humidity conditions. [0003] Engine 1Cr11Ni2W2MoV steel forgings are usually air-cooled or slow-cooled after forging, and then normalized + tempered + quenche...

Claims

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Application Information

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IPC IPC(8): C21D9/28C21D9/30C21D8/00C21D6/00
Inventor 秦卫东王国强薛强甄小辉王华郑建新
Owner SHAANXI HONGYUAN AVIATION FORGING
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