Control method for implementing microstructure by non quenched and tempered steel hot forging formation

A technology of non-quenched and tempered steel and microstructure, applied in the field of forging and forming, can solve the problems of unsuitable development cycle and cost control requirements, high development cost, long trial production time, etc., and achieve the effect of shortening process trial production time and avoiding costs

Inactive Publication Date: 2011-02-16
SHANGHAI JIAO TONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the trial production time is long, the development cost is high, and it is far from meeting the development cycle and cost control requirements of the current manufacturing industry.

Method used

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  • Control method for implementing microstructure by non quenched and tempered steel hot forging formation
  • Control method for implementing microstructure by non quenched and tempered steel hot forging formation
  • Control method for implementing microstructure by non quenched and tempered steel hot forging formation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0036] Take the non-quenched and tempered steel automobile piston as an example, the material is 38MnVS6(Ti).

[0037] (1) Through the thermal simulation compression test, the mathematical model of flow stress of 38MnVS6(Ti) under high temperature conditions, the mathematical model of microstructure under steady state conditions and the mathematical model of microstructure under unsteady state conditions are established, as shown in Table 1 and Table 1. 2 and Table 3.

[0038]

[0039]

[0040]

[0041]

[0042] (2) Using the disclosed continuous cooling thermal simulation test method, the austenite to ferrite and pearlite continuous cooling transition curves of 38MnVS6 (Ti) were measured, as figure 1 shown. Using the published quantitative metallographic analysis method, the relationship between the volume fraction of ferrite and pearlite and the cooling rate in the continuous cooling process of 38MnVS6(Ti) is determined, respectively as follows figure 2 and ...

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Abstract

The invention discloses a control method for implementing a microstructure by non quenched and tempered steel hot forging formation in the technical field of forging formation. The method comprises the following steps of: predicting evolution rules of the microstructure in the full multi-procedure hot forging process by using deformation-hot-tissue multi-physical field coupling simulation and adopting commercial finite element software and a microstructure evolution calculation and analysis tool of secondary development, wherein the evolution rules comprise dynamic re-crystallization percentage, grain size and distribution rule of ferrite and pearlite in a forged piece; and then by using uniform dynamic re-crystallization distribution, avoidance of local grain roughening and reasonable distribution of the ferrite and the pearlite in the forged piece as goals, adjusting the hot forging process parameters to acquire reasonable microstructure distribution and realize 'shape control' and 'property control' of non quenched and tempered steel hot forging, and finally obtaining a forged piece product with good comprehensive mechanical properties. The method can avoid practical physical trial manufacture, remarkably shorten the development time and reduce the development cost of the hot forging process.

Description

technical field [0001] The invention relates to a microstructure control method in the field of forging forming technology, in particular to a control method for realizing the microstructure of non-quenched and tempered steel hot forging forming based on multi-physics field coupling simulation. Background technique [0002] The medium-carbon-manganese alloy steel containing microalloying elements such as V and Ti, through the forging process, the alloying elements are dispersed and precipitated as C and N compounds, so that the steel reaches the strength level after quenching and tempering, thus eliminating the subsequent quenching and tempering treatment and simplifying the process. The production process is simplified, energy can be saved, and it has good economic and social benefits. The parts manufactured by the hot forging process of non-quenched and tempered steel are widely used in the manufacture of parts of the power system of mechanical products. Since the non-que...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00
Inventor 赵震陈军赵祖德黄少东唐全波刘川林李祖荣曹洋赵军朱世风王进
Owner SHANGHAI JIAO TONG UNIV
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