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Refining method for grain size of 32Cr3MoVE forge piece

A technology for grain size and forgings, which is applied in the field of grain size refinement of 32Cr3MoVE forgings, can solve the problems of poor grain size refinement effect and achieve the effect of grain size improvement

Inactive Publication Date: 2017-05-03
SHAANXI HONGYUAN AVIATION FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 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 32Cr3MoVE forging is poor by using the conventional heat treatment method

Method used

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Experimental program
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Effect test

Embodiment Construction

[0020] The production and development of a certain type of machine forging is selected below, and the process steps of the present invention are described in detail.

[0021] The first step: First, heat the Φ280mm 32Cr3MoVE bar at 1070°C and then forge it, with a deformation of 40%;

[0022] Step 2: After the billet is forged, carry out high-temperature normalizing (below 500°C into the furnace, heat up to 530°C for a certain period of time, then heat up to 760°C for a certain period of time, and finally directly heat up to 990°C) + 670°C high-temperature tempering;

[0023] Step 3: Perform conventional quenching at 940 to 950°C + tempering at 635°C for the billet

[0024] After the above three steps, the forgings are subjected to high-temperature normalizing treatment under normal deformation conditions, and the grain size uniformity reaches grade 6 or above, which meets the standard requirements.

[0025] To sum up, the grain size of the 32Cr3MoVE forging produced by the pr...

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Abstract

The invention relates to a refining method for the grain size of a 32Cr3MoVE forge piece. Usually, after the 32Cr3MoVE forge piece is forged, conventional normalizing, tempering, quenching and tempering heat treatment are conducted, the high grain size can generally reach the 5-6 level, and the standard level is required to be 6 or higher. According to the refining method, high-temperature normalizing and tempering are conducted after forging, and the structure grain size can stably reach the 6-7 level or higher.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of thermal processing of medium-carbon low-alloy steel, and relates to a method for refining the grain size of a 32Cr3MoVE forging. [0003] Background technique: [0004] 32Cr3MoVE is a medium carbon low alloy nitrided steel. The steel has high hardenability, good nitriding performance and comprehensive mechanical properties. After nitriding, the surface can obtain high hardness and wear resistance, and the core has good strength and toughness. The steel is a nitriding steel with excellent comprehensive properties. This steel is used to manufacture important parts such as bevel gears and gear shafts of helicopter transmission systems. [0005] 32Cr3MoVE forgings for helicopter engines are usually subjected to conventional normalizing, tempering, quenching, and tempering heat treatments after forging. The high-magnification grain size can generally reach 5 to 5.5 levels, and it is difficult to unif...

Claims

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Application Information

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IPC IPC(8): C21D8/00C21D6/00
Inventor 薛强王国强秦卫东甄小辉王华
Owner SHAANXI HONGYUAN AVIATION FORGING