Strengthening and toughening heat treatment method of hot work die steel 4Cr5MoSiV1

A technology of hot work die steel and heat treatment method, applied in the field of hot work die steel, which can solve the problems of reducing the strength and toughness, carbide and banded structure segregation of hot work die steel 4Cr5MoSiV1, achieve uniform microstructure and reduce large-scale carbonization The effect of reducing objects and bands

Inactive Publication Date: 2013-01-09
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
View PDF0 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional heat treatment process of hot work die steel 4Cr5MoSiV1 is as follows: anneal with the furnace temperature up to 850-870°C, heat it for a period of time, then cool it to 500°C in the furnace, then air cool; heat it again to 550-600°C for a period of time, continue heating to 800 -850°C for a period of time, continue to heat to 1030-1050°C for a period of time, oil cooling or air cooling, tempering at 600°C, then tempering at 580°C, if there is a special need for a third tempering treatment, after The performance of 4Cr5MoSiV1 treated by the above heat treatment process basically meets the requirements for the use of common molds, but for large, precise, complex hot work die steels that need to be served under high temperature conditions for a long time, the above heat treatment process can no longer meet its use requirements. The segregation of carbides and banded structures is serious, which reduces the strength and toughness of hot work die steel 4Cr5MoSiV1

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Strengthening and toughening heat treatment method of hot work die steel 4Cr5MoSiV1
  • Strengthening and toughening heat treatment method of hot work die steel 4Cr5MoSiV1
  • Strengthening and toughening heat treatment method of hot work die steel 4Cr5MoSiV1

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Put the 4Cr5MoSiV1 steel material into the resistance furnace, raise the temperature to 850°C, and control the holding time to 60s per mm of steel material thickness;

[0026] (2) Continue to heat up to 1090°C, control the holding time to 70s per mm of steel thickness, and air cool to room temperature;

[0027] (3) Put the 4Cr5MoSiV1 steel material into the resistance furnace again, raise the temperature to 700°C, keep it warm for 90min, and air cool to room temperature;

[0028] (4) Put the 4Cr5MoSiV1 steel material into the salt bath furnace, raise the temperature to 940°C, and control the holding time to 60s per mm of steel material thickness;

[0029] (5) Take it out and quickly put it into a salt bath furnace with a temperature of 730°C, and control the holding time to 60s per mm of steel thickness, then take it out and quickly put it into a salt bath furnace at a temperature of 940°C, and control the holding time to 60s per mm of steel thickness 60s;

[0030...

Embodiment 2

[0034] (1) Put the 4Cr5MoSiV1 steel material into the resistance furnace, raise the temperature to 860°C, and control the holding time to 75s per mm of steel material thickness;

[0035] (2) Continue to heat up to 1100°C, control the holding time to 80s per mm of steel thickness, and air cool to room temperature;

[0036] (3) Put the 4Cr5MoSiV1 steel material into the resistance furnace again, raise the temperature to 710°C, keep it warm for 90min, and air cool to room temperature;

[0037] (4) Put the 4Cr5MoSiV1 steel material into the salt bath furnace, raise the temperature to 950°C, and control the holding time to 75s per mm of steel material thickness;

[0038] (5) Take it out and quickly put it into a salt bath furnace with a temperature of 740°C, and control the holding time to 75s per mm of steel thickness, then take it out and quickly put it into a salt bath furnace at a temperature of 950°C, and control the holding time to 75s per mm of steel thickness 75s;

[0039...

Embodiment 3

[0043] (1) Put the 4Cr5MoSiV1 steel material into the resistance furnace, raise the temperature to 850-870°C, and control the holding time to 90s per mm of steel material thickness;

[0044] (2) Continue to heat up to 1110°C, control the holding time to 90s per mm of steel thickness, and cool to room temperature with oil;

[0045] (3) Put the 4Cr5MoSiV1 steel material into the resistance furnace again, raise the temperature to 720°C, keep it warm for 90min, and air cool to room temperature;

[0046] (4) Put the 4Cr5MoSiV1 steel material into the salt bath furnace, raise the temperature to 960°C, and control the holding time to 90s per mm of steel material thickness;

[0047] (5) Take it out and quickly put it into a salt bath furnace with a temperature of 750°C, and control the holding time to 90s per mm of steel thickness, then take it out and quickly put it into a salt bath furnace at a temperature of 960°C, and control the holding time to 90s per mm of steel thickness 90s;...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a strengthening and toughening heat treatment method of hot work die steel 4Cr5MoSiV1, which is characterized by comprising the following steps of: 1, placing a steel material in a resistance furnace, setting the temperature to 850-870 DEG C, preserving the temperature for 60-90s per millimeter of steel material; 2, raising the temperature to 1090-1110 DEG C, preserving the temperature for 70-90s per millimeter of steel material, oil cooling or air cooling to room temperature; 3, then re-placing the steel material in the resistance furnace, raising the temperature to 700-720 DEG C, preserving the temperature for 90min, air cooling to room temperature; 4, placing the steel material in a salt bath furnace, raising the temperature to 940-960 DEG C, preserving the temperature for 60-90s per millimeter of steel material; 5, taking the steel material out and then rapidly placing in a salt bath furnace with a temperature of 730-750 DEG C, preserving the temperature for 60-90s per millimeter of steel material, then taking the steel material out and then rapidly placing in a salt bath furnace with a temperature of 940-960 DEG C, preserving the temperature for 60-90s per millimeter of steel material; 6, repeating the step 5 for 3-5 times, air cooling to room temperature; 7, placing the steel material in a tempering furnace, reducing the temperature to 600 DEG C, preserving the temperature for 90 min, air cooling to room temperature; and 8, placing the steel material in the tempering furnace again, reducing the temperature to 580 DEG C, preserving the temperature for 90min, and air cooling to room temperature to obtain the hot work die steel. The hot work die steel 4Cr5MoSiV1 has the advantages of remarkable refined grains, uniform microstructure, reduced large-size carbide and lightened banded structure.

Description

technical field [0001] The invention relates to a hot work die steel, in particular to a strengthening and toughening heat treatment method of the hot work die steel 4Cr5MoSiV1. Background technique [0002] Hot work die steel 4Cr5MoSiV1 has excellent hardenability, hardenability and good room temperature and high temperature properties, and is widely used in dies with high thermal fatigue tensile strength, good toughness, and temperatures <700 °C. [0003] At present, the traditional heat treatment process of hot work die steel 4Cr5MoSiV1 is as follows: anneal with the furnace temperature up to 850-870°C, heat it for a period of time, then cool it to 500°C in the furnace, then air cool; heat it again to 550-600°C for a period of time, continue heating to 800 -850°C for a period of time, continue to heat to 1030-1050°C for a period of time, oil cooling or air cooling, tempering at 600°C, then tempering at 580°C, if there is a special need for a third tempering treatment, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C21D1/25
Inventor 王芳袁书强田雨江刘峰涛易更高永亮陈炯周春华
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap