Bainite auctile iron isothermal quenching technology

A bainitic nodular, isothermal quenching technology, applied in the field of warm quenching technology, can solve the problems of unfavorable processing, pollution and cost increase in salt baths

Inactive Publication Date: 2006-01-11
MATERIAL SCI RES INST SHANDONG INST OFCIVIL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problem that salt bath is unfavorable for processing in current austempering bainite ductile iron process, and also causes pollution, and the cost increases after adding allo

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 2

[0030] Sample No

example 3

[0033] Among them, T-troostite, B 上 - Upper bainite, B 下 - lower bainite, M - martensite, A' - retained austenite.

[0034] The data in the above table is based on the data in the experiment. In the calculation, the water temperature of 20°C can be used as the standard, and the data from 1.5-4 seconds can be used as S 0 , and then the rest of the data can be selected accordingly.

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PUM

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Abstract

An isothermal quenching technology for the nodular graphite cast iron of bainite includes such steps as heating to bainite temp region, holding the temp for a certain time, cooling in water, cooling in isothermal furnace, and cooling in air. Its advantages are high quality of product, no pollution, and low cost.

Description

technical field [0001] The invention relates to a quenching process for bainite ductile iron, in particular to an isothermal quenching process for bainite ductile iron using water as a quenching medium. Background technique [0002] Bainitic ductile iron has comprehensive mechanical properties of high strength, plasticity and toughness, which is significantly better than that of spheroidic-ferritic ductile iron, and also superior to ductile cast iron that has been quenched and tempered. For example, its tensile strength can reach 1000Mpa and its elongation can reach 10%. In particular, this cast iron has high bending fatigue strength and good wear resistance. Therefore, the emergence of austempered bainitic ductile iron is known as one of the major achievements in cast iron metallurgy in the past 40 years. However, the commonly used austempering bainitic ductile iron process has the following problems: [0003] 1. At present, the main development is salt bath isothermal q...

Claims

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Application Information

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IPC IPC(8): C21D5/00C21D1/20
Inventor 许爱民刘科高李成美管庭兰
Owner MATERIAL SCI RES INST SHANDONG INST OFCIVIL ENG
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