CN105132652A - Heat treatment method for improving comprehensive performances of ultrahigh-strength high alloy structural steel - Google Patents
Heat treatment method for improving comprehensive performances of ultrahigh-strength high alloy structural steel Download PDFInfo
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- CN105132652A CN105132652A CN201510497254.3A CN201510497254A CN105132652A CN 105132652 A CN105132652 A CN 105132652A CN 201510497254 A CN201510497254 A CN 201510497254A CN 105132652 A CN105132652 A CN 105132652A
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Abstract
The invention discloses a heat treatment method for improving comprehensive performances of ultrahigh-strength high alloy structural steel; a core technology of the method is to change a ratio of different metallographic structure contents to improve the comprehensive mechanical performance of materials by fully using existing heat treatment conditions through changing a cooling mode and controlling the cooling speed and time; meanwhile, the invention provides a new thought for solving problems; and a method adopted by the thought is helpful to solve the difficulty of weak matching between the strength index and the plastic toughness index of ultrahigh strength materials under conditions of conventional heat treatment process schemes.
Description
technical field:
The invention belongs to heat-treatment technology method field, especially a kind of heat treating method improving superstrength high alloy-structural steel over-all properties.
background technology:
The service requirements of superstrength high alloy-structural steel is higher, have higher requirements to the intensity (tensile strength Rm) of forging and plasticity and toughness (unit elongation A and relative reduction in area Z) index, these two kinds of indexs are two kinds of requirements conflicting in material mechanical performance index simultaneously.Its each index request value is in table one.
Certain superstrength high alloy-structural steel material mechanical performance index request value of table 1
From table 1, the direction 1 of this material is compared with another both direction, and to intensity and plasticity and toughness, this synchronously increases the requirement of contradictory performance criteria, and such requirement is very harsh, implements difficulty larger.
According to the cooling characteristic of this material, in heat treatment process, take the type of cooling that traditional is as cold as the end, will be fabulous because of the hardening capacity of material, and obtain single martensitic stucture, thus because intensity is too high, plasticity and toughness can not meet index request after tempering to make sample; Adopt salt bath austempering technique perhaps can obtain satisfactory result, but this will increase considerably production cost, this technique can affect the healthy of test operation personnel and pollute Working environment simultaneously; And expect by increasing means that the method for tempering temperature increases its plasticity and toughness inapplicable for this material, this is because after this material increase tempering temperature, plasticity and toughness index may slightly increase, but intensity can decline thereupon, and there is significant temper brittleness due to this high alloy-structural steel material, its ballistic work is also significantly reduced, to such an extent as to occurs all underproof situation of many index.
Thus, thoroughly must change thinking, improvement of production process, could really deal with problems.
summary of the invention:
In order to solve the problem, the invention provides a kind of heat treating method improving superstrength high alloy-structural steel over-all properties.
The technical solution adopted for the present invention to solve the technical problems:
Improve a heat treating method for superstrength high alloy-structural steel over-all properties, it is characterized in that: comprise the steps:
1) by blanks roughing to predetermined size;
2) the blank material in step 1 is heated to predetermined heat treatment temperature 870-920 DEG C, insulation 1-1.5 hour;
3) soaking time arrives, and material is implemented oil cooling, and cooling time is 90-120 second;
4) after arriving cooling time, be incubated rapidly by the stove of material transfer to 250-300 DEG C, soaking time is 25-35 minute;
5) take out material and again carry out oil cooling, cooling time is 10-40 minute;
6) be again put into by material in the stove of 250-300 DEG C and be incubated 2-4 hour, the stress in material is eliminated in abundant tempering;
7) take out material, heat treatment step completes.
Oil in described step 3 and step 5 is quenching oil, and time limit of service can not more than 1 year.
Owing to adopting technical scheme as above, the present invention has following superiority:
A kind of heat treating method improving superstrength high alloy-structural steel over-all properties of the present invention, the core technology of the method is to make full use of existing heat-treat condition, by changing the type of cooling, rely on controlled cooling model speed and time, change the proportioning of different metallographic structure content, improve the object of the comprehensive mechanical property of material, simultaneously, the invention provides a kind of new approaches of dealing with problems, the method that this thinking is taked contributes to solving under the condition of normative heat treatment process program, the intensity index of ultrastrength material and plasticity and toughness index are difficult to a difficult problem for good collocation.
embodiment:
Can explain the present invention in more detail by the following examples, disclose object of the present invention and be intended to protect all changes and improvements in the scope of the invention, the present invention is not limited to the following examples;
Application example: a kind of superstrength high alloy-structural steel material, adopt normative heat treatment technique, its intensity is very high, but plasticity and toughness index synchronously can not improve with the raising of intensity index, can not meet product service requirements.In order to improve the plasticity and toughness of material, making it have good comprehensive mechanical property, improving the use properties of product, now taking following improvement project:
1) by blanks roughing to specified dimension;
2) heating materials to 900 DEG C is incubated 1h;
3) soaking time arrives, and implement oil cooling to material, the oil cooling time is 100s, now notes wanting the strict controlled cooling model time, and object improves the plasticity and toughness of forging;
4) arrive cooling time, be incubated rapidly by material transfer to 280 DEG C stove, the time is 30min;
5) take out material oil cooling 10 minutes, ensure the intensity of material;
6) 270 DEG C of insulation 3h, the stress in material is eliminated in abundant tempering;
7) take out material, heat treatment step completes.
Through experiencing the actual production of multiple batches of similar-type products, utilize the product of above heat treating method process, its performance index are as shown in table 2, its intensity and plasticity and toughness index all can obtain good result, meet technical requirements, the plasticity and toughness of product significantly improve, and also still have good intensity simultaneously.
Mechanical performance index before and after certain superstrength high alloy-structural steel material processing of table 2
Carefully do not state part in above content for prior art, therefore do not run business into particular one and state.
Claims (2)
1. improve a heat treating method for superstrength high alloy-structural steel over-all properties, it is characterized in that: comprise the steps:
1) by blanks roughing to predetermined size;
2) the blank material in step 1 is heated to predetermined heat treatment temperature 870-920 DEG C, insulation 1-1.5 hour;
3) soaking time arrives, and material is implemented oil cooling, and cooling time is 90-120 second;
4) after arriving cooling time, be incubated rapidly by the stove of material transfer to 250-300 DEG C, soaking time is 25-35 minute;
5) take out material and again carry out oil cooling, cooling time is 10-40 minute;
6) be again put into by material in the stove of 250-300 DEG C and be incubated 2-4 hour, the stress in material is eliminated in abundant tempering;
7) take out material, heat treatment step completes.
2. a kind of heat treating method improving superstrength high alloy-structural steel over-all properties according to claim 1, is characterized in that: the oil in step 3 and step 5 is quenching oil, and time limit of service can not more than 1 year.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510497254.3A CN105132652A (en) | 2015-08-14 | 2015-08-14 | Heat treatment method for improving comprehensive performances of ultrahigh-strength high alloy structural steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510497254.3A CN105132652A (en) | 2015-08-14 | 2015-08-14 | Heat treatment method for improving comprehensive performances of ultrahigh-strength high alloy structural steel |
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| CN105132652A true CN105132652A (en) | 2015-12-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113684428A (en) * | 2021-07-16 | 2021-11-23 | 北京科技大学 | Heat treatment method for enhancing impact energy of ultrahigh-strength steel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101134995A (en) * | 2007-10-16 | 2008-03-05 | 长安汽车（集团）有限责任公司 | Alloy spring steel ultra-fine martensite heat treatment quenching strengthening process |
| CN101597680A (en) * | 2009-07-09 | 2009-12-09 | 贵州大学 | Train 60Si2CrVA steel spring goods quenching-distribution thermal treatment process |
| CN101597679A (en) * | 2009-07-09 | 2009-12-09 | 贵州大学 | High-speed heavy loading locomotive 50CrVA steel spring quenching-isothermal heat treatment process |
| CN104561478A (en) * | 2014-12-23 | 2015-04-29 | 人本集团有限公司 | High-carbon chromium bearing steel GCr15 lower bainite heat treatment technique |
-
2015
- 2015-08-14 CN CN201510497254.3A patent/CN105132652A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101134995A (en) * | 2007-10-16 | 2008-03-05 | 长安汽车（集团）有限责任公司 | Alloy spring steel ultra-fine martensite heat treatment quenching strengthening process |
| CN101597680A (en) * | 2009-07-09 | 2009-12-09 | 贵州大学 | Train 60Si2CrVA steel spring goods quenching-distribution thermal treatment process |
| CN101597679A (en) * | 2009-07-09 | 2009-12-09 | 贵州大学 | High-speed heavy loading locomotive 50CrVA steel spring quenching-isothermal heat treatment process |
| CN104561478A (en) * | 2014-12-23 | 2015-04-29 | 人本集团有限公司 | High-carbon chromium bearing steel GCr15 lower bainite heat treatment technique |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113684428A (en) * | 2021-07-16 | 2021-11-23 | 北京科技大学 | Heat treatment method for enhancing impact energy of ultrahigh-strength steel |
| CN113684428B (en) * | 2021-07-16 | 2022-03-04 | 北京科技大学 | Heat treatment method for enhancing impact energy of ultrahigh-strength steel |
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Application publication date: 20151209 |