CN106755771B - Softening method of CSS-42L gear steel forging stock - Google Patents
Softening method of CSS-42L gear steel forging stock Download PDFInfo
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- CN106755771B CN106755771B CN201611097355.2A CN201611097355A CN106755771B CN 106755771 B CN106755771 B CN 106755771B CN 201611097355 A CN201611097355 A CN 201611097355A CN 106755771 B CN106755771 B CN 106755771B
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- forging stock
- gear steel
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2261/00—Machining or cutting being involved
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to a softening method of CSS-42L gear steel forging stock, which is characterized in that high-temperature austenitizing, oil quenching and stress relieving treatment are carried out, so that the material is wholly in a supercooled austenite state, the supercooled austenite belongs to a soft tissue, and the hardness is low, so that the hardness of the CSS-42L gear steel can be greatly reduced to HRC 28-35, and the requirement of machining is met.
Description
Technical Field
The invention relates to a softening method, in particular to a softening method of a CSS-42L gear steel forging stock.
Background
With the gradual increase of the loading capacity of the aircraft, people put forward extremely high requirements on the comprehensive mechanical property and the temperature resistance of the aviation parts. CSS-42L third generation gear steel was developed in the United states, and one of the obvious characteristics of the steel is that the steel has good high temperature red hardness and excellent high temperature tempering resistance, can be used for a long time below 427 ℃, but a plurality of metallurgical characteristics of the steel are not mastered at home.
The traditional gear steel forging blank is generally subjected to quenching and tempering treatment before mechanical cutting processing so as to obtain proper cutting hardness. CSS-42L third generation pinion steel belongs to low carbon high alloying martensite precipitation hardening stainless steel, has good hardenability, shows excellent high temperature tempering resistance after the material is quenched, and because of excellent comprehensive high temperature mechanical property, the CSS-42L engineering application range is gradually expanded. However, the hardness of the material forging after 680 ℃ sub-temperature annealing is as high as HRC40, the machining is extremely difficult, especially the machining of large-scale cavity parts with complex structures is extremely difficult, and the problem is not solved by relevant literature reports at present.
Disclosure of Invention
The invention aims to provide a softening method of a CSS-42L gear steel forging stock, which changes the heat treatment state of the CSS-42L gear steel so that the hardness of the CSS-42L gear steel before mechanical cutting is HRC 28-35, and facilitates subsequent mechanical cutting.
The specific scheme adopted for softening the CSS-42L forging stock is as follows:
1. placing the CSS-42L forging stock in a vacuum oil quenching furnace for high-temperature austenitizing at 1050-1150 ℃, and performing vacuum oil quenching after heat preservation for 0.5-6 h, wherein the temperature of a quenching oil bath is 40-75 ℃;
2. after oil quenching, stress relief treatment is carried out at 100-300 ℃, and the stress relief time is 1-6 h;
3. after the stress is eliminated, the mechanical cutting processing can be carried out.
Because the alloy content of the CSS-42L material exceeds 30 wt.%, the Ms point is greatly reduced, the whole material is in a supercooled austenite state after oil quenching, the supercooled austenite belongs to a soft tissue, and the hardness is low, so that the hardness of the CSS-42L gear steel can be greatly reduced to HRC 28-35; after mechanical processing, cold treatment and aging treatment are carried out, so that the base material can be restored to the hardness after quenching and tempering, the HRC 45-55 is achieved, and the final hardness requirement specified by the process is met.
Detailed Description
A softening method of CSS-42L gear steel forging stock comprises the following steps:
1. placing the CSS-42L forging stock in a vacuum oil quenching furnace for high-temperature austenitizing at 1050-1150 ℃, and performing vacuum oil quenching after heat preservation for 0.5-6 h, wherein the temperature of a quenching oil bath is 40-75 ℃;
2. after oil quenching, stress relief treatment is carried out at 100-300 ℃, and the stress relief time is 1-6 h;
3. after the stress is eliminated, the mechanical cutting processing can be carried out.
Examples
The forging stock of the hollow gear shaft for a certain aviation transmission system is made of CSS-42L gear steel, the hardness of the forging stock of the material is up to HRC45.1 after the forging stock is subjected to 680 ℃ sub-temperature annealing, and the forging stock is softened to ensure the machining requirement of the forging stock by the following steps:
1. carrying out high-temperature austenitization on the CSS-42L blank at the temperature of 1110 ℃, carrying out oil quenching after heat preservation is carried out for 1, wherein the temperature of a quenching oil bath is 55 ℃;
2. after oil quenching, stress relief treatment is carried out at 150 ℃, and the stress relief time is 2 h;
3. after the stress was removed, machining was performed.
By the method, the hardness of the CSS-42L forging stock is reduced from HRC45.1 to HRC30.3, and the metal cutting performance of the material can be greatly improved.
Claims (1)
1. A softening method of CSS-42L gear steel forging stock is characterized by comprising the following steps:
1) placing the CSS-42L forging stock in a vacuum oil quenching furnace for high-temperature austenitizing at 1050-1150 ℃, and performing vacuum oil quenching after heat preservation for 0.5-6 h, wherein the temperature of a quenching oil bath is 40-75 ℃;
2) after oil quenching, stress relief treatment is carried out at 100-300 ℃, and the stress relief time is 1-6 h;
3) after the stress is eliminated, the mechanical cutting processing can be carried out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611097355.2A CN106755771B (en) | 2016-12-02 | 2016-12-02 | Softening method of CSS-42L gear steel forging stock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611097355.2A CN106755771B (en) | 2016-12-02 | 2016-12-02 | Softening method of CSS-42L gear steel forging stock |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106755771A CN106755771A (en) | 2017-05-31 |
| CN106755771B true CN106755771B (en) | 2021-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611097355.2A Active CN106755771B (en) | 2016-12-02 | 2016-12-02 | Softening method of CSS-42L gear steel forging stock |
Country Status (1)
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| CN (1) | CN106755771B (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001068933A2 (en) * | 2000-03-14 | 2001-09-20 | The Timken Company | High performance carburizing stainless steel for high temperature use |
| CN105568177A (en) * | 2015-12-31 | 2016-05-11 | 钢铁研究总院 | Cu composite reinforced high-strength and toughness secondary hardening heat resistant steel and preparation method |
| CN106086631B (en) * | 2016-08-23 | 2018-05-01 | 钢铁研究总院 | High nitrogen martensite stainless bearing steel of high-hardness, wearable and preparation method thereof |
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2016
- 2016-12-02 CN CN201611097355.2A patent/CN106755771B/en active Active
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| Publication number | Publication date |
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| CN106755771A (en) | 2017-05-31 |
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