JPH03197618A - Heat treatment of maraging steel - Google Patents
Heat treatment of maraging steelInfo
- Publication number
- JPH03197618A JPH03197618A JP33895389A JP33895389A JPH03197618A JP H03197618 A JPH03197618 A JP H03197618A JP 33895389 A JP33895389 A JP 33895389A JP 33895389 A JP33895389 A JP 33895389A JP H03197618 A JPH03197618 A JP H03197618A
- Authority
- JP
- Japan
- Prior art keywords
- maraging steel
- heat treatment
- temperature
- aging
- treatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910001240 Maraging steel Inorganic materials 0.000 title claims abstract description 22
- 238000010438 heat treatment Methods 0.000 title claims abstract description 15
- 230000032683 aging Effects 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000005389 magnetism Effects 0.000 abstract description 5
- 230000004907 flux Effects 0.000 description 10
- 230000007423 decrease Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910000765 intermetallic Inorganic materials 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、軟質な磁気特性（軟磁性）を有するマルエー
ジング鋼の熱処理法に関し、詳しくは、溶体化処理、時
効処理条件を改善することにより軟質磁気特性を向上さ
せることを目的とするものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a heat treatment method for maraging steel having soft magnetic properties (soft magnetism), and more specifically, a method for improving solution treatment and aging treatment conditions. The purpose of this is to improve soft magnetic properties.
［従来技術］
近年、各種産業機器、更には原子力設備、航空宇宙設備
等においては、誘導電動機の回転体などに高強度軟磁性
材料が要求されている。即ち、例えば高速回転体のヨー
ク材、リレー材には、軟磁性であると共に高強度な材料
が要求されている。[Prior Art] In recent years, high-strength soft magnetic materials are required for rotating bodies of induction motors and the like in various industrial equipment, as well as nuclear equipment, aerospace equipment, and the like. That is, for example, yoke materials and relay materials for high-speed rotating bodies are required to be soft magnetic and high-strength materials.
しかして、上記高強度軟磁性材料としては１８Ｎｉマル
エージング鋼がある。一般に１８Ｎｉマルエージング鋼
は高強度を得るための熱処理が施される。まず、溶体化
処理が施される。この処理は通常８１０〜８２０ ’Ｃ
の温度に加熱保持後空冷するといった方法がとられる。The above-mentioned high-strength soft magnetic material includes 18Ni maraging steel. Generally, 18Ni maraging steel is heat treated to obtain high strength. First, solution treatment is performed. This process usually takes place at 810-820'C
A method is used in which the material is heated and maintained at a temperature of , and then air cooled.
溶体化処理後は、時効処理が施される。この処理は通常
５００℃の温度に加熱後空冷するといった方法がとられ
る。After the solution treatment, an aging treatment is performed. This treatment is usually carried out by heating to a temperature of 500° C. and then air cooling.
［解決しようとする課題］
しかしながら、上記従来の１８Ｎｉマルエージング鋼の
熱処理で得られる特性は、引張強度は１７５Ｋｇｆ／ｍ
ｍ”以上と高いものの、軟磁性材料として重要な特性で
ある保磁力が約２０エルステツド（Ｏｅ）以上であるた
め、磁気的に十分に軟質とは言えない。[Problem to be solved] However, the properties obtained by heat treatment of the above conventional 18Ni maraging steel have a tensile strength of 175 Kgf/m.
Although it has a high coercive force of more than 20 oersteds (Oe), which is an important property for soft magnetic materials, it cannot be said to be magnetically sufficiently soft.
本発明は、かかる従来の問題点に鑑み、軟質磁性に優れ
た１８Ｎｉマルエージング鋼を得るための熱処理方法を
提供しようとするものである。In view of these conventional problems, the present invention aims to provide a heat treatment method for obtaining 18Ni maraging steel with excellent soft magnetism.
本発明者は、１８Ｎｉマルエージング鋼について溶体化
処理温度及び時効処理温度と磁気的性質及び機械的性質
の関係を詳細に調査したところ、従来とは異なる温度範
囲で熱処理を施すと軟質磁気特性が向上する事実を発見
した。The present inventor conducted a detailed study on the relationship between solution treatment temperature, aging treatment temperature, magnetic properties, and mechanical properties of 18Ni maraging steel, and found that when heat treatment is performed in a temperature range different from conventional ones, soft magnetic properties change. I discovered something that will improve.
すなわち、本発明は、１８Ｎｉマルエージング鋼に溶体
化処理及び時効処理を施す熱処理法において、溶体化処
理温度を８５０〜１１００℃及び時効処理温度を４３０
〜４８０ ’Ｃとしたことを特徴とするマルエージング
鋼の熱処理法である。That is, in the heat treatment method of subjecting 18Ni maraging steel to solution treatment and aging treatment, the present invention provides a solution treatment temperature of 850 to 1100°C and an aging treatment temperature of 430°C.
This is a heat treatment method for maraging steel, characterized in that the temperature is ~480'C.
本発明において、１７５Ｋｇｆ／ｍｍ”以上の高強度と
優れた軟磁性を得るに対象となる１８Ｎｉマルエージン
グ鋼としては、例えば下記のようなものがある。In the present invention, examples of the 18Ni maraging steel that can be used to obtain high strength of 175 Kgf/mm" or higher and excellent soft magnetism include the following.
（示下衆台）
化学組成（ｗｔ％）
また、本発明において溶体化処理温度を８５０〜１１０
０℃としたのは、１８Ｎｉマルエージング鋼をオーステ
ナイト単相になるまで加熱した後、常温に冷却したとき
、すべてマルテンサイト変態させ、未固溶の析出物が残
留しないようにするためには、を８５０℃以上にする必
要があるためである。(Presentation table) Chemical composition (wt%) In addition, in the present invention, the solution treatment temperature is 850 to 110
The temperature was set at 0°C in order to ensure that when the 18Ni maraging steel is heated until it becomes a single austenite phase and then cooled to room temperature, all martensitic transformation occurs and no undissolved precipitates remain. This is because it is necessary to raise the temperature to 850°C or higher.
他方、溶体化処理温度が高くなるにつれて、磁束密度が
上昇し、保磁力が小さくなるが、１１００℃を越えて高
くすると靭性の低下が著しいので上限を１１００℃とし
た。On the other hand, as the solution treatment temperature increases, the magnetic flux density increases and the coercive force decreases, but if the temperature is increased beyond 1100°C, the toughness decreases significantly, so the upper limit was set at 1100°C.
さらに、溶体化処理後の時効処理温度を４３０〜４８０
℃としたのは、１８Ｎｉマルエージング鋼のマルテンサ
イト相単相中に金属間化合物を析出させるためには、時
効処理温度を４３０℃以上とする必要があるためであり
、時効温度が４３０℃未満のときは強度が低下し、更に
、磁束密度も減少する。Furthermore, the aging treatment temperature after solution treatment was set to 430 to 480.
℃ because in order to precipitate intermetallic compounds in the martensitic single phase of 18Ni maraging steel, the aging treatment temperature needs to be 430℃ or higher, and the aging temperature is lower than 430℃. In this case, the strength decreases, and the magnetic flux density also decreases.
他方、時効処理温度が高くなるにつれて強度が上昇する
ものの、保磁力もまた増加する。特に、時効処理温度が
４８０℃を越えた場合には、逆変態オーステナイトが析
出して、保磁力を増大させる一方、磁束密度を低下させ
る。更に、逆変態オステナイトの析出によって、強度も
低下する。On the other hand, as the aging temperature increases, although the strength increases, the coercive force also increases. In particular, when the aging treatment temperature exceeds 480° C., reversely transformed austenite precipitates, increasing the coercive force while decreasing the magnetic flux density. Furthermore, the strength also decreases due to the precipitation of reverse transformed austenite.
従って、上限を４８０ ”Ｃとした。Therefore, the upper limit was set at 480''C.
時効時間は０．１〜２０時間が適当であり、好ましくは
１〜５時間である。２０時間を越えるときは、事実上、
製造費用が高価となるので好ましくない。The aging time is suitably 0.1 to 20 hours, preferably 1 to 5 hours. In fact, when it exceeds 20 hours,
This is not preferable because the manufacturing cost is high.
本発明による溶体化処理温度および時効処理温度により
熱処理を施すことにより、従来の熱処理法で得られるマ
ルエージング鋼に比べて、軟質磁気特性の優れたマルエ
ージング鋼が得られる。By performing heat treatment at the solution treatment temperature and aging treatment temperature according to the present invention, a maraging steel with superior soft magnetic properties can be obtained compared to maraging steel obtained by conventional heat treatment methods.
以下に本発明の効果を実施例でもって明らかにする。重
量％でＣｏ０．００８％、Ｎｉ；１Ｂ。The effects of the present invention will be clarified by examples below. Co 0.008%, Ni; 1B by weight.
４％、Ｃｏ；８．１％、Ｍｏ；４．８％、Ｔｉ；０．５
％、残部Ｆｅおよび不純物元素よりなる１８Ｎｉマルエ
ージング鋼を常法に従って溶製、鍛造し、加工を施して
供試材とし、その保磁力、磁束密度、引張強さ及び伸び
につき測定した。4%, Co; 8.1%, Mo; 4.8%, Ti; 0.5
%, the balance being Fe and impurity elements was melted, forged and processed according to a conventional method to obtain a test material, and its coercive force, magnetic flux density, tensile strength and elongation were measured.
保磁力（Ｏｅ）及び磁束密度（ＫＧ）に関しζは、外径
２４ｍｍ、内径１６ｍｍ、厚み１６ｍｍのリング状試験
片を用いて、直流磁気特性を測定し、保磁力Ｈｃと５０
エルステツド（Ｏｅ）における磁束密度Ｂ、。を測定し
た。Regarding coercive force (Oe) and magnetic flux density (KG), ζ is determined by measuring DC magnetic characteristics using a ring-shaped test piece with an outer diameter of 24 mm, an inner diameter of 16 mm, and a thickness of 16 mm, and the coercive force Hc and 50
Magnetic flux density B, in Oersted (Oe). was measured.
引張強さ（Ｋｇｒ／ｍｍ”）及び伸び（％）は、平行部
の直径５ｍｍ、長さ２５ｍｍの平滑引張試験片を作製し
、種々の温度で溶体化処理及び時効処理を施した後測定
した。Tensile strength (Kgr/mm") and elongation (%) were measured after preparing smooth tensile test pieces with a parallel part diameter of 5 mm and length of 25 mm, and subjected to solution treatment and aging treatment at various temperatures. .
第１図に７７０〜１１７０’Ｃの温度で溶体化処理を施
した場合の磁束密度保磁力、引張強さ、伸びへの影響を
示す。なお、時効処理温度は４６０℃としている。溶体
化温度が７７０℃の場合には、磁束密度が低く、保磁力
が高い。また、溶体化温度が１１７０℃の場合には伸び
が減少している。FIG. 1 shows the effects on magnetic flux density, coercive force, tensile strength, and elongation when solution treatment is performed at a temperature of 770 to 1170'C. Note that the aging treatment temperature is 460°C. When the solution temperature is 770°C, the magnetic flux density is low and the coercive force is high. Moreover, when the solution temperature was 1170°C, the elongation decreased.
これに対して、本発明に従って８５０〜１１００℃の温
度域で溶体化処理した場合には、磁束密度はＩＩＫＧ以
上、保磁力は２００ｅ以下と優れた軟質磁気特性を有し
、また引張強さは１８０Ｋｇｆ／ｍｍ”以上伸びは８％
以上と機械的性質についても優れている。On the other hand, when solution treatment is performed in the temperature range of 850 to 1100°C according to the present invention, it has excellent soft magnetic properties with a magnetic flux density of IIKG or more and a coercive force of 200e or less, and has a tensile strength of 180Kgf/mm" or more elongation is 8%
It also has excellent mechanical properties.
第２図に４００〜５７０℃の温度で時効処理を施した場
合の磁束密度、保磁力、引張強さ、伸びへの影響を示す
、なお、溶体化処理温度は８７０℃としている。時効処
理温度が４００℃の場合には、マルテンサイト相中に金
属間化合物の析出が少なく引張強さが低い。また、時効
温度が４８０℃以上の場合には、保磁力が高くなり２０
工ルステツド以上になってしまう。これに対して、本発
明範囲の４３０〜４８０℃の温度で時効処理を施した場
合には、保磁力２０エルステツド以下及び引張強さ１８
０ｋｇｆ／ｍｍ”以上になっている。FIG. 2 shows the effects on magnetic flux density, coercive force, tensile strength, and elongation when aging treatment is performed at a temperature of 400 to 570°C, and the solution treatment temperature is 870°C. When the aging treatment temperature is 400° C., there is little precipitation of intermetallic compounds in the martensitic phase, and the tensile strength is low. In addition, when the aging temperature is 480°C or higher, the coercive force increases to 20°C.
It becomes more than the construction level. On the other hand, when aging treatment is performed at a temperature of 430 to 480°C, which is within the range of the present invention, the coercive force is 20 oersted or less and the tensile strength is 18
0kgf/mm" or more.
第１図は１８Ｎｉマルエージング鋼の溶体化処理温度と
磁気的性質及び機械的性質との関係を示す線図、第２図
は同調の時効処理温度と磁気的性質及び機械的性質との
関係を示す線図である。Figure 1 is a diagram showing the relationship between solution treatment temperature and magnetic and mechanical properties of 18Ni maraging steel, and Figure 2 is a diagram showing the relationship between synchronous aging treatment temperature and magnetic and mechanical properties. FIG.
Claims (1)
処理を施す熱処理法において、溶体化処理温度を８５０
〜１１００℃及び時効処理温度を４３０〜４８０℃とし
たことを特徴とするマルエージング鋼の熱処理法。(1) In a heat treatment method in which 18Ni maraging steel is subjected to solution treatment and aging treatment, the solution treatment temperature is 850.
1100C and an aging treatment temperature of 430 to 480C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33895389A JPH03197618A (en) | 1989-12-26 | 1989-12-26 | Heat treatment of maraging steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33895389A JPH03197618A (en) | 1989-12-26 | 1989-12-26 | Heat treatment of maraging steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03197618A true JPH03197618A (en) | 1991-08-29 |
Family
ID=18322886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33895389A Pending JPH03197618A (en) | 1989-12-26 | 1989-12-26 | Heat treatment of maraging steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03197618A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015520660A (en) * | 2012-04-18 | 2015-07-23 | ディーエスエム アイピー アセッツ ビー．ブイ． | Equipment useful for hydrogenation reaction (II) |
| CN111793767A (en) * | 2020-06-19 | 2020-10-20 | 攀钢集团江油长城特殊钢有限公司 | Preparation method of 18Ni steel consumable electrode |
-
1989
- 1989-12-26 JP JP33895389A patent/JPH03197618A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015520660A (en) * | 2012-04-18 | 2015-07-23 | ディーエスエム アイピー アセッツ ビー．ブイ． | Equipment useful for hydrogenation reaction (II) |
| CN111793767A (en) * | 2020-06-19 | 2020-10-20 | 攀钢集团江油长城特殊钢有限公司 | Preparation method of 18Ni steel consumable electrode |
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