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Isothermal treatment method for nodular cast iron bainite

A nodular cast iron, isothermal treatment technology, applied in the field of temperature treatment, can solve the problems of consuming manpower, material resources and time, unstable isothermal temperature, and low production efficiency

Inactive Publication Date: 2008-07-16
山东建筑大学材料科学研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the production process, the nitrate volatilized gas and nitrate molten liquid are toxic, which will seriously endanger the health of operators and pollute the surrounding environment.
The second is that hot workpieces entering the nitrate melt at 250°C-400°C will cause instability in the isothermal temperature. If the heat dissipation conditions are not ideal, the quality will be unstable.
Third, due to the limitation of production methods, the production efficiency is low, it is difficult to realize mechanized production, and the production cost is high
Even if it can be determined through experiments, facing workpieces with ever-changing sizes and shapes, it is like crossing the river by feeling the stones. overall cost of processing

Method used

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  • Isothermal treatment method for nodular cast iron bainite
  • Isothermal treatment method for nodular cast iron bainite
  • Isothermal treatment method for nodular cast iron bainite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Embodiment 1. basic process data table example

[0074] Table 1 Basic cooling water temperature T 0 =Basic process data table at 30℃

[0075]

[0076] Table 2 Basic process data table for practical cooling water temperature T=40°C

[0077]

Embodiment 3

[0078] Embodiment 3. Controlled cooling process parameter search example

[0079] The size of a workpiece to be processed is Φ16×100mm to calculate R=3.70; look up table 1, the basic standard workpiece with a basic size of Φ22×22 (mm) has R=3.67. The cooling parameters R of the two are very similar, so the process parameters of Φ22×22 (mm) can be used to control the cooling treatment of a workpiece to be processed.

Embodiment 4

[0080] Example 4.T 0 , t, n 0 Examples of relevant process data sheets

[0081] Table 3T 0 , t, n 0 Process data sheet (measured)

[0082] Sample size

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Abstract

The invention provides a ductile iron bainite isothermal processing method, including the processing steps of: heating up the ductile iron to the austenite region; taking the water as a cooling medium for controlling the cooling, adjusting the even temperature, processing the isothermal and tempering. In the cooling control phase, the cooling control technique parameter is determined by the cooling parameter R. During the even temperature phase, the control temperature is regulated to carry out the isothermal treatment on the work-piece under the condition that the temperature is proximal to the isothermal treatment temperature, thus ensuring the stable technique, the matrix structure and the excellent performance of the processed work-piece.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a ductile iron isothermal treatment process, in particular to a ductile iron bainite isothermal treatment method. Background technique [0002] Bainitic nodular cast iron has high comprehensive mechanical properties and can maximize the potential of nodular cast iron. Its manufacturing technology has attracted extensive attention from material workers and foundry engineering circles in various countries. Bainitic nodular cast iron is an excellent The material has been widely and successfully applied to various aspects, such as: camshafts, crankshafts, steering joints, tractor components, train wheels and gears, etc. It has good anti-fatigue performance, anti-scratch performance, wear resistance, vibration damping and machining performance. And compared with steel products, the cost is lower and the energy saving is larger. [0003] The slow development of bainitic nodular cast iron...

Claims

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Application Information

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IPC IPC(8): C21D5/00C21D1/20
Inventor 许爱民刘科高
Owner 山东建筑大学材料科学研究所
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