Thermal treatment method of 42CrMo workpiece

A heat treatment method and workpiece technology, applied in the field of heat treatment, can solve the problems of uncoordinated deformation, peeling off, and reduced processing efficiency of the surface hardened layer, and achieve the effects of uniform and fine metallographic structure, elimination of quenching stress, and optimization of mechanical properties.

Inactive Publication Date: 2014-03-26
ZOOMLION HEAVY IND CO LTD
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  • Abstract
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Problems solved by technology

For the heat treatment method of normalizing treatment and surface induction hardening treatment in sequence, although the surface hardness of the prepared 42CrMo crawler pin is increased, the wear resistance is improved, but the matrix strength and toughness are not enough to cause inconsistency with the deformation of the surface hardened layer. It is easy to cause the surface hardened layer to collapse, peel off and break
For the heat treatment method of sequential quenching and tempering treatment and surface induction hardening treatment, there are many heat treatment processes and high energy consumption, which reduces the processing efficiency and increases the cost

Method used

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  • Thermal treatment method of 42CrMo workpiece
  • Thermal treatment method of 42CrMo workpiece
  • Thermal treatment method of 42CrMo workpiece

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Effect test

Embodiment

[0033] Carry out heat treatment to 42CrMo track pin, the diameter of track pin in embodiment 1-6 is 35 millimeters, the diameter of track pin in embodiment 7-12 is 50 millimeters, track pin is carried out quenching treatment and tempering treatment successively: in quenching treatment In the process, the track pins are heated to the quenching temperature at the quenching heating rate, and the track pins are kept at the quenching temperature for the quenching and holding time, and then the track pins are cooled to the quenching final cooling temperature in the quenching cooling medium; in the tempering process, the Tempering heating speed Heat the track pins to the tempering temperature, keep the track pins at the tempering temperature for a tempering holding time, and then cool the track pins to the tempering final cooling temperature in the tempering cooling medium. The quenching heating rate, quenching temperature, quenching holding time, quenching final cooling temperature a...

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Abstract

The invention discloses a thermal treatment method of a 42CrMo workpiece. The effective size of the workpiece is D millimeters. The thermal treatment method comprises the steps of sequentially carrying out quenching treatment and tempering treatment on the workpiece. The method is characterized in that the quenching treatment comprises the steps of heating the workpiece to 830-870 DEG C, preserving the heat for 2.0*D-3.5*D minutes and cooling the workpiece in a quenching cooling medium; the tempering treatment comprises the steps of heating the workpiece to 470-520 DEG C, preserving the heat for 2.4*D-3.4*D minutes and cooling the workpiece in the quenching cooling medium, wherein the D is a number greater than zero. The thermal treatment method is few in process and the 42CrMo workpiece obtained by using the method is good in mechanical property.

Description

technical field [0001] The invention relates to the field of heat treatment, in particular to a heat treatment method for a 42CrMo workpiece. Background technique [0002] At present, the track pin is a metal pin used to connect the track shoes into a track. During the working process of the track, the track pin bears the impact on the one hand, and rotates in the pin hole of the track shoe on the other hand, causing strong friction. In the medium tonnage and It is especially obvious in large-tonnage crawler cranes; in addition, the two track shoes connected by track pins will respectively generate a large twisting force on the track pins, which will easily twist and deform or even break the track pins; Due to complex alternating loads, fatigue, wear and even fracture accidents often occur due to insufficient strength, hardness and toughness, resulting in short service life of track pins and frequent replacement, which also increases processing costs. [0003] 42CrMo is a c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18
Inventor 刘延斌蒋凯歌汪斌
Owner ZOOMLION HEAVY IND CO LTD
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