JP2016069703A - Nickel-based casting alloy and hot forging mold - Google Patents
Nickel-based casting alloy and hot forging mold Download PDFInfo
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本発明は、ニッケル基鋳造合金及び熱間鍛造金型に関する。 The present invention relates to a nickel-base casting alloy and a hot forging die.
例えば、航空機のエンジンや、発電用ガスタービン等に用いられる部品は、高温でも高い強度を有する耐熱合金によって製造される。これらの耐熱合金からなる製品を金型を用いて鍛造する場合、鍛造金型は高温でも高い機械的強度が必要である。 For example, parts used in aircraft engines, power generation gas turbines, and the like are manufactured from heat-resistant alloys having high strength even at high temperatures. When forging a product made of these heat-resistant alloys using a mold, the forging mold needs to have high mechanical strength even at a high temperature.
例えば、金型と鍛造素材を共に１０００℃以上の温度に加熱して鍛造するいわゆる恒温鍛造において使用する鍛造金型の材料としては、従来、Ｍｏをベースとし、ＴｉとＺｒを添加したＴＺＭと呼ばれるＭｏ基合金が使用されている。しかし、ＴＺＭは耐酸化性が劣るため、真空又は不活性ガス中で鍛造を行う必要がある。
また、Ｔｉ合金の恒温鍛造に用いる金型として、Ｎｉをベースとし、Ｃｒ、Ｗ、Ｃｏ、Ａｌ、Ｔｉ等を含むＭａｒ−Ｍ２００と呼ばれるＮｉ基合金が知られている。しかし、Ｍａｒ−Ｍ２００は耐酸化性は高いが、高温圧縮強度が不十分であり、金型温度が１０００℃を超える鍛造金型には使用できない。
For example, as a material of a forging die used in so-called constant temperature forging in which both a die and a forging material are heated to a temperature of 1000 ° C. or more, it is conventionally called TZM based on Mo and added with Ti and Zr. Mo-based alloy is used. However, since TZM has poor oxidation resistance, it is necessary to perform forging in a vacuum or an inert gas.
Also, a Ni-based alloy called Mar-M200 based on Ni and containing Cr, W, Co, Al, Ti, and the like is known as a mold used for constant temperature forging of a Ti alloy. However, although Mar-M200 has high oxidation resistance, it has insufficient high-temperature compressive strength and cannot be used for a forging die having a die temperature exceeding 1000 ° C.
一方、高温圧縮強度及び耐酸化性に優れ、１０００℃以上の温度で大気中でも使用できる鍛造金型用合金として、Ｎｉをベースとし、Ｍｏ、Ｗ、及びＡｌを含むＮｉｍｏｗａｌ（登録商標）と呼ばれるＮｉ基合金が提案されている（例えば、特許文献１〜３参照）。 On the other hand, as an alloy for forging dies which is excellent in high-temperature compressive strength and oxidation resistance and can be used in the atmosphere at a temperature of 1000 ° C. or higher, Ni is called Ninowal (registered trademark) containing Ni, Mo, W and Al Base alloys have been proposed (see, for example, Patent Documents 1 to 3).
Ｎｉｍｏｗａｌ（登録商標）合金は鋳造で製造され、大気中で金型を高温に加熱して行う熱間鍛造の金型として使用できる反面、延性が低いため、鋳造する際の凝固時の応力により割れ（鋳造割れ）が発生し易い。そのため、Ｎｉｍｏｗａｌ（登録商標）合金を用いて特に大型の製品を製作することが困難であり、また、製造歩留まりが悪いという問題がある。 Nimowal (registered trademark) alloy is manufactured by casting and can be used as a hot forging die by heating the die to high temperature in the atmosphere, but it has low ductility, so it cracks due to the stress during solidification during casting (Casting cracks) easily occur. Therefore, it is difficult to produce a particularly large product using the Nimalal (registered trademark) alloy, and there is a problem that the manufacturing yield is poor.
そこで、本発明は、大気中で１０００℃以上に金型を加熱して行う熱間鍛造の金型材料として使用でき、且つ、鋳造割れの発生が抑制されるニッケル基鋳造合金を提供することを目的とする。
また、本発明は、大気中で１０００℃以上に金型を加熱して行う熱間鍛造に使用できる熱間鍛造金型を提供することを目的とする。
Therefore, the present invention provides a nickel-base casting alloy that can be used as a die material for hot forging performed by heating a die to 1000 ° C. or higher in the atmosphere and that suppresses the occurrence of casting cracks. Objective.
Moreover, an object of this invention is to provide the hot forging die which can be used for the hot forging performed by heating a die to 1000 degreeC or more in air | atmosphere.
前記目的を達成するため、以下の発明が提供される。
＜１＞ Ｗの含有量が１０．３０〜１１．００質量％、Ｍｏの含有量が９．００〜１１．００質量％、Ａｌの含有量が５．８０〜６．８０質量％、及び、Ｙの含有量が０．００〜０．０２質量％であり、且つ、残部がＮｉ及び不可避的不純物であるニッケル基鋳造合金。
＜２＞ Ｙの含有量が０．０１質量％未満である＜１＞に記載のニッケル基鋳造合金。
＜３＞ Ｈｆの含有量が０．００〜２．００質量％、Ｆｅの含有量が０．００〜１．００質量％、及びＭｇの含有量が０．０００〜０．０１４質量％、Ｚｒの含有量が０．００〜０．５０質量％である＜１＞又は＜２＞に記載のニッケル基鋳造合金。
＜４＞ ＜１＞〜＜３＞のいずれか１つに記載のニッケル基鋳造合金からなる熱間鍛造金型。
In order to achieve the above object, the following invention is provided.
<1> W content is 10.30 to 11.00 mass%, Mo content is 9.00 to 11.00 mass%, Al content is 5.80 to 6.80 mass%, and A nickel-base cast alloy having a Y content of 0.00 to 0.02% by mass and the balance being Ni and inevitable impurities.
<2> The nickel-base cast alloy according to <1>, wherein the Y content is less than 0.01% by mass.
<3> The content of Hf is 0.00 to 2.00 mass%, the content of Fe is 0.00 to 1.00 mass%, and the content of Mg is 0.000 to 0.014 mass%, Zr The nickel-base cast alloy according to <1> or <2>, wherein the content of is 0.00 to 0.50 mass%.
<4> A hot forging die made of the nickel-base cast alloy according to any one of <1> to <3>.
本発明によれば、大気中で１０００℃以上に金型を加熱して行う熱間鍛造の金型材料として使用でき、且つ、鋳造割れの発生が抑制されるニッケル基鋳造合金、及び、大気中で１０００℃以上に金型を加熱して行う熱間鍛造に使用できる熱間鍛造金型を提供することができる。 According to the present invention, a nickel-base casting alloy that can be used as a die material for hot forging performed by heating a die to 1000 ° C. or higher in the atmosphere and that suppresses the occurrence of casting cracks, and the atmosphere Thus, a hot forging die that can be used for hot forging performed by heating the die to 1000 ° C. or higher can be provided.
以下、本発明のニッケル基鋳造合金について詳細に説明する。以下の説明において数値範囲を表す「〜」は下限値及び上限値として記載されている数値を含む範囲を意味する。
なお、本発明のニッケル基鋳造合金は、熱間鍛造の金型材料に限らず、熱間で圧縮応力が加わる用途に適用することができるが、以下、最適な用途である熱間鍛造の金型材料として用いる場合について主に説明する。
Hereinafter, the nickel-base cast alloy of the present invention will be described in detail. In the following description, “to” representing a numerical range means a range including numerical values described as a lower limit value and an upper limit value.
The nickel-base cast alloy of the present invention can be applied not only to hot forging die materials but also to applications where compressive stress is applied hot. The case where it is used as a mold material will be mainly described.
本発明者らは、Ｎｉｍｏｗａｌ（登録商標）合金の成分を詳細に検討した結果、ＷとＹの添加が鋳造割れの発生に大きく影響していることがわかった。その理由は定かでないが、Ｙは結晶粒界に偏析して粒界延性を低下し、Ｗは鋳造の凝固終了時に多量の共晶γ’相を形成して延性を低下させていることが鋳造割れを引き起こす原因であると考えられる。
さらに、本発明者らは、鋳造割れの発生を抑制するとともに高温圧縮強度及び耐酸化性に優れたＮｉ基鋳造合金を見出すべく、ＷとＹのほか、他の成分についても鋭意検討を重ねたところ、Ｎｉ、Ｗ、Ｍｏ、Ａｌを必須成分とし、Ｙを任意成分としてそれぞれ特定の範囲の組成を有するＮｉ基鋳造合金とすることにより、高温圧縮強度及び耐酸化性に優れ、且つ、鋳造割れの発生が抑制されるニッケル基鋳造合金が得られること、また、このニッケル基鋳造合金を切削して金型を製造することで、大気中で１０００℃以上に金型を加熱して行う熱間鍛造の金型として好適に使用できることを見出した。
As a result of examining the components of the Nimowal (registered trademark) alloy in detail, the inventors have found that the addition of W and Y greatly affects the occurrence of casting cracks. The reason is not clear, but Y segregates at the grain boundaries to lower the grain boundary ductility, and W forms a large amount of eutectic γ 'phase at the end of casting solidification to reduce the ductility. This is thought to be the cause of cracking.
Furthermore, the present inventors have made extensive studies on other components in addition to W and Y in order to find a Ni-based cast alloy that suppresses the occurrence of casting cracks and is excellent in high-temperature compressive strength and oxidation resistance. However, Ni, W, Mo, Al are essential components, Y is an optional component, and Ni-based casting alloy having a specific range of composition, respectively, is excellent in high-temperature compressive strength and oxidation resistance, and cast cracking. The production of a nickel-base cast alloy that suppresses the generation of heat, and the production of a mold by cutting this nickel-base cast alloy so that the mold is heated to 1000 ° C. or higher in the atmosphere. It has been found that it can be suitably used as a forging die.
［ニッケル基鋳造合金］
本発明のニッケル基鋳造合金（以下、「Ｎｉ基鋳造合金」又は単に「合金」と記す場合がある。）は、Ｗの含有量が１０．３０〜１１．００質量％、Ｍｏの含有量が９．００〜１１．００質量％、Ａｌの含有量が５．８０〜６．８０質量％、及び、Ｙの含有量が０．００〜０．０２質量％であり、且つ、残部がＮｉ及び不可避的不純物で構成されている。
[Nickel-based casting alloy]
The nickel-base cast alloy of the present invention (hereinafter sometimes referred to as “Ni-base cast alloy” or simply “alloy”) has a W content of 10.30 to 11.00 mass% and a Mo content of 10. 9.00 to 11.00% by mass, Al content is 5.80 to 6.80% by mass, Y content is 0.00 to 0.02% by mass, and the balance is Ni and Consists of inevitable impurities.
＜Ｗ＞
Ｗは、オーステナイトマトリックスに固溶するとともに、析出強化相であるＮｉ３Ａｌを基本型とするガンマプライム相にも固溶して合金の高温強度を高める。また、Ｗは、粒界にＷとＭｏの固溶体からなる体心立方晶のα‐（Ｍｏ、Ｗ）相を晶出し、合金の粒界強度を高め、合金の被削性を高める作用がある。一方、Ｗは、耐酸化性を低下させる作用も有し、且つ、１１．００質量％を超えて添加すると割れが発生し易くなる。高温強度を高め、耐酸化性の低下を抑制し、且つ、割れの発生をより抑制する観点から、本発明のＮｉ基鋳造合金中のＷの含有量は１０．３０〜１１．００質量％とし、１０．４０〜１０．７０質量％であることが好ましい。
<W>
W forms a solid solution in the austenite matrix and also forms a solid solution in the gamma prime phase based on Ni 3 Al as a precipitation strengthening phase, thereby increasing the high temperature strength of the alloy. In addition, W crystallizes a body-centered cubic α- (Mo, W) phase consisting of a solid solution of W and Mo at the grain boundary, thereby increasing the grain boundary strength of the alloy and increasing the machinability of the alloy. . On the other hand, W also has an effect of lowering oxidation resistance, and cracks are likely to occur when added in excess of 11.00% by mass. The content of W in the Ni-based cast alloy of the present invention is 10.30 to 11.00% by mass from the viewpoint of increasing the high-temperature strength, suppressing the decrease in oxidation resistance, and further suppressing the occurrence of cracks. It is preferable that it is 10.40-10.70 mass%.
＜Ｍｏ＞
Ｍｏは、オーステナイトマトリックスに固溶するとともに、析出強化相であるＮｉ３Ａｌを基本型とするガンマプライム相にも固溶して合金の高温強度を高める。一方、Ｍｏは、耐酸化性を低下させる作用を有する。高温強度を高め、且つ、耐酸化性の低下をより抑制する観点から、本発明のＮｉ基鋳造合金中のＭｏの含有量は９．００〜１１．００質量％とし、９．５０〜１０．５０質量％であることが好ましく、９．８０〜１０．２０質量％であることがより好ましい。
<Mo>
Mo dissolves in the austenite matrix and also dissolves in the gamma prime phase based on Ni 3 Al, which is a precipitation strengthening phase, to increase the high temperature strength of the alloy. On the other hand, Mo has the effect | action which reduces oxidation resistance. From the viewpoint of increasing the high-temperature strength and further suppressing the decrease in oxidation resistance, the Mo content in the Ni-base cast alloy of the present invention is 9.00 to 11.00% by mass, and 9.50 to 10.5. It is preferable that it is 50 mass%, and it is more preferable that it is 9.80-10.20 mass%.
＜Ａｌ＞
Ａｌは、Ｎｉと結合してＮｉ３Ａｌからなるガンマプライム相を析出し、合金の高温強度を高め、合金の表面にアルミナの被膜を生成し、合金に耐酸化性を付与する作用がある。一方、Ａｌの含有量が多過ぎると、共晶ガンマプライム相を過度に生成し、合金の高温強度を低める作用もある。耐酸化性及び高温強度を高める観点から、本発明のＮｉ基鋳造合金中のＡｌの含有量は５．８０〜６．８０質量％とし、６．００〜６．６０質量％であることが好ましく、６．１０〜６．４０質量％であることがより好ましい。
<Al>
Al binds to Ni and precipitates a gamma prime phase composed of Ni 3 Al, thereby increasing the high temperature strength of the alloy, generating an alumina coating on the surface of the alloy, and imparting oxidation resistance to the alloy. On the other hand, when the content of Al is too large, an eutectic gamma prime phase is excessively generated, and the high temperature strength of the alloy is lowered. From the viewpoint of enhancing oxidation resistance and high temperature strength, the Al content in the Ni-base cast alloy of the present invention is 5.80 to 6.80 mass%, preferably 6.00 to 6.60 mass%. 6-10.40% by mass is more preferable.
＜Ｙ＞
Ｙは合金の表面に生成するアルミナ被膜の緻密性及び密着性を改善し、耐酸化性を高める作用があるが、本発明者らの研究によればＹは合金の内部の割れ（鋳造割れ）の原因になり、Ｙの含有量が０．０３質量％以上であると鋳造割れが発生し易くなる。Ｎｉ基鋳造合金の耐酸化性はＡｌによっても得られるため、本発明のＮｉ基鋳造合金におけるＹの含有量は、割れの発生を抑制する観点から０．０２質量％以下とし、０．０１質量％未満であることが好ましく、０．００％（検出限界以下）であることがより好ましい。
<Y>
Y has the effect of improving the denseness and adhesion of the alumina coating formed on the surface of the alloy and enhancing the oxidation resistance, but according to the study by the present inventors, Y is a crack inside the alloy (cast crack). If the Y content is 0.03% by mass or more, casting cracks are likely to occur. Since the oxidation resistance of the Ni-base cast alloy can be obtained also by Al, the content of Y in the Ni-base cast alloy of the present invention is set to 0.02 mass% or less from the viewpoint of suppressing the occurrence of cracks, and 0.01 mass % Is preferable, and 0.00% (below the detection limit) is more preferable.
＜Ｎｉ＞
本発明のＮｉ基鋳造合金は、基本的に、必須成分であるＡｌ、Ｗ、Ｍｏと任意成分であるＹ、さらに不可避的不純物を除く残部がＮｉで構成される。本発明のＮｉ基鋳造合金においてＮｉはガンマ相を構成する主要元素であるとともに、Ａｌ、Ｍｏ、Ｗとともにガンマプライム相を構成する。
高温強度を高め、且つ、耐酸化性の低下をより抑制する観点から、本発明のＮｉ基鋳造合金におけるＮｉの含有量は６７質量％以上であることが好ましく、６８〜７４質量％であることがより好ましい。
<Ni>
The Ni-based cast alloy of the present invention basically comprises Al, W, Mo, which are essential components, Y, which is an optional component, and the balance other than unavoidable impurities, which is Ni. In the Ni-based cast alloy of the present invention, Ni is a main element constituting a gamma phase and constitutes a gamma prime phase together with Al, Mo and W.
From the viewpoint of increasing the high-temperature strength and further suppressing the decrease in oxidation resistance, the Ni content in the Ni-based cast alloy of the present invention is preferably 67% by mass or more, and 68 to 74% by mass. Is more preferable.
本発明のＮｉ基鋳造合金は、Ｎｉ、Ｍｏ、Ｗ、Ａｌ、Ｙのほか、不可避的不純物又は任意の微量成分として、Ｎｉ、Ｍｏ、Ｗ、Ａｌ、Ｙ以外の成分（以下、「その他の成分」と記す。）を含むことができる。
その他の成分としては、例えば、Ｃ、Ｓｉ、Ｍｎ、Ｐ、Ｓ、Ｃｒ、Ｆｅ、Ｚｒ、Ｈｆ、Ｍｇ、Ｂ、Ｏ、Ｎ等が挙げられるが、これらの元素に限定されるものではない。
本発明のＮｉ基鋳造合金は、その他の成分として、特に、Ｈｆ、Ｆｅ、Ｍｇ、及びＺｒから選ばれる少なくとも１種をそれぞれ鋳造割れの発生が抑制される範囲で含有することができる。なお、本発明のＮｉ基鋳造合金におけるその他の成分の合計含有量は、２質量％以下が好ましく、１質量％以下がより好ましい。
In addition to Ni, Mo, W, Al, and Y, the Ni-based cast alloy of the present invention includes components other than Ni, Mo, W, Al, and Y as unavoidable impurities or optional trace components (hereinafter “other components”). Can be included.).
Examples of other components include C, Si, Mn, P, S, Cr, Fe, Zr, Hf, Mg, B, O, and N, but are not limited to these elements.
The Ni-based cast alloy of the present invention can contain, as other components, at least one selected from Hf, Fe, Mg, and Zr, as long as the occurrence of casting cracks is suppressed. In addition, 2 mass% or less is preferable and, as for the total content of the other component in the Ni base cast alloy of this invention, 1 mass% or less is more preferable.
＜Ｈｆ＞
本発明のＮｉ基鋳造合金は、Ｈｆを０．００〜２．００質量％の範囲で含んでもよい。本発明のＮｉ基鋳造合金にＨｆが２．００質量％以下の範囲で含まれていても割れの発生を抑制することができる。また、Ｈｆが０．５０質量％以下の範囲で含まれていることで、耐酸化性を向上させる効果を期待することができる。
<Hf>
The Ni-based cast alloy of the present invention may contain Hf in the range of 0.00 to 2.00% by mass. Even if Hf is contained in the range of 2.00% by mass or less in the Ni-base cast alloy of the present invention, the occurrence of cracks can be suppressed. Moreover, the effect which improves oxidation resistance can be anticipated because Hf is contained in 0.50 mass% or less.
＜Ｆｅ＞
Ｆｅは、鋳造する際に原料等から混入し易い。本発明のＮｉ基鋳造合金は、Ｆｅを０．００〜１．００質量％の範囲で含んでもよい。本発明のＮｉ基鋳造合金にＦｅが１．０質量％以下の範囲で含まれていても、割れの発生を抑制することができる。また、Ｆｅが１．００質量％以下の範囲で含まれていることでスクラップ使用によるコスト低減効果を期待することができる。
<Fe>
Fe is likely to be mixed from raw materials and the like during casting. The Ni-based cast alloy of the present invention may contain Fe in the range of 0.00 to 1.00% by mass. Even if Fe is contained in the range of 1.0 mass% or less in the Ni-based cast alloy of the present invention, the occurrence of cracks can be suppressed. Moreover, the cost reduction effect by scrap use can be anticipated because Fe is contained in the range of 1.00 mass% or less.
＜Ｍｇ＞
本発明のＮｉ基鋳造合金は、Ｍｇを０．０００〜０．０１４質量％の範囲で含んでもよい。本発明のＮｉ基鋳造合金にＭｇが０．０１４質量％以下の範囲で含まれていても割れの発生を抑制することができる。また、Ｍｇが０．０１４質量％以下の範囲で含まれていることで結晶粒界を強化する効果を期待することができる。
<Mg>
The Ni-based cast alloy of the present invention may contain Mg in the range of 0.000 to 0.014% by mass. Even if Mg is contained in the Ni-base cast alloy of the present invention in a range of 0.014% by mass or less, generation of cracks can be suppressed. Moreover, the effect which strengthens a crystal grain boundary can be anticipated because Mg is contained in 0.014 mass% or less.
＜Ｚｒ＞
本発明のＮｉ基鋳造合金は、Ｚｒを０．００〜０．５０質量％の範囲で含んでもよい。本発明のＮｉ基鋳造合金にＺｒが０．５０質量％以下の範囲で含まれていても割れの発生を抑制することができる。また、Ｚｒが０．５０質量％以下の範囲で含まれていることで耐酸化性を向上させる効果を期待することができる。
<Zr>
The Ni-base cast alloy of the present invention may contain Zr in a range of 0.00 to 0.50 mass%. Even if Zr is contained in the Ni-based cast alloy of the present invention in the range of 0.50% by mass or less, generation of cracks can be suppressed. Moreover, the effect which improves oxidation resistance can be anticipated because Zr is contained in 0.50 mass% or less.
＜Ｏ＞
本発明のＮｉ基鋳造合金は、Ｏ（酸素）の含有量が少ないことが好ましい。本発明のＮｉ基鋳造合金に酸素が多く存在すると酸化物（非金属介在物）を形成し、鍛造用の金型とした場合に非金属介在物が起点となって疲労強度を低下させる原因となり得る。そのため、本発明のＮｉ基鋳造合金に含まれる酸素濃度は、３０ｐｐｍ以下であることが好ましく、８ｐｐｍ以下であることがより好ましい。
本発明のＮｉ基鋳造合金は、鋳造において原料を溶解する際に雰囲気中の酸素濃度を低くすること、溶湯を鋳型に注入する際に雰囲気中の酸素を巻き込まないようにすることなどでＮｉ基鋳造合金中の酸素濃度を低くすることができる。
<O>
The Ni-based cast alloy of the present invention preferably has a low O (oxygen) content. When a large amount of oxygen is present in the Ni-based cast alloy of the present invention, oxides (non-metallic inclusions) are formed, and when a forging die is formed, non-metallic inclusions are the starting point and cause fatigue strength to decrease. obtain. Therefore, the oxygen concentration contained in the Ni-based cast alloy of the present invention is preferably 30 ppm or less, and more preferably 8 ppm or less.
The Ni-base cast alloy of the present invention is made of a Ni-base by reducing the oxygen concentration in the atmosphere when melting the raw material in casting, and preventing the oxygen in the atmosphere from being involved when the molten metal is injected into the mold. The oxygen concentration in the cast alloy can be lowered.
−ニッケル基鋳造合金の製造方法−
本発明のニッケル基鋳造合金は、Ｎｉ、Ｍｏ、Ｗ、Ａｌ、さらに、必要に応じてＹ等の任意成分を含む原料を用いて溶解し、鋳造することができる。鋳造方法としては公知の方法を採用することができる。
-Manufacturing method of nickel-base casting alloy-
The nickel-base cast alloy of the present invention can be melted and cast using a raw material containing optional components such as Ni, Mo, W, Al and, if necessary, Y. As a casting method, a known method can be employed.
具体的には、所定の量の原料を合金の融点以上に加熱して溶解する。 Specifically, a predetermined amount of the raw material is heated to the melting point of the alloy or higher to dissolve.
溶湯を鋳型に流し込み、徐冷する。鋳型の材質、大きさ、形状等は特に限定されず、Ｎｉ基鋳造合金の用途、製造コスト等に応じて選択すればよい。また、鋳造における雰囲気も特に限定されず、大気中、真空中、Ａｒ等の不活性ガス雰囲気中で行うことができる。なお、Ｎｉ基鋳造合金中の酸素の含有量を低く抑える観点から、真空中、Ａｒ等の不活性ガス雰囲気中で鋳造することが好ましい。 Pour molten metal into mold and cool slowly. The material, size, shape, and the like of the mold are not particularly limited, and may be selected according to the use of the Ni-base cast alloy, the manufacturing cost, and the like. Moreover, the atmosphere in casting is not specifically limited, It can carry out in air | atmosphere, a vacuum, and inert gas atmosphere, such as Ar. Note that, from the viewpoint of keeping the oxygen content in the Ni-based casting alloy low, it is preferable to perform casting in vacuum or in an inert gas atmosphere such as Ar.
冷却により凝固した後、合金と鋳型を分離することにより鋳造割れの発生が抑制された本発明のＮｉ基鋳造合金を得ることができる。 After solidifying by cooling, the Ni-based cast alloy of the present invention in which the occurrence of casting cracks is suppressed can be obtained by separating the alloy and the mold.
［熱間鍛造金型］
本発明のＮｉ基鋳造合金は、鋳造したときに内部における割れの発生が抑制されるため、高い歩留りで製造することができる。そして、本発明のＮｉ基鋳造合金は高温圧縮強度及び耐酸化性に優れ、熱間鍛造用の金型材料として好適に用いることができる。
上記のようにして鋳造した本発明のＮｉ基鋳造合金を切削加工等によって成形して所望の形状の金型とすればよい。
本発明のＮｉ鋳造基合金からなる熱間鍛造金型は、例えば、航空機のジェットエンジン部品や、発電機用ガスタービン部品等を大気中で１０００℃以上に金型を加熱して熱間鍛造する際に用いる金型として好適に使用することができる。
なお、本発明のＮｉ基鋳造合金は、熱間鍛造用の金型材料に最適であるが、熱間鍛造用金型に限定されず、熱間で圧縮応力が加わる用途に適用可能である。
[Hot forging die]
The Ni-based cast alloy of the present invention can be produced with a high yield because the occurrence of internal cracks is suppressed when cast. The Ni-based cast alloy of the present invention is excellent in high-temperature compressive strength and oxidation resistance, and can be suitably used as a mold material for hot forging.
The Ni-base cast alloy of the present invention cast as described above may be formed by cutting or the like to obtain a mold having a desired shape.
The hot forging die made of the Ni casting base alloy of the present invention is, for example, hot forging by heating the die to 1000 ° C. or higher in the air for jet engine parts of aircraft, gas turbine parts for generators, etc. It can be suitably used as a mold used for the occasion.
The Ni-based cast alloy of the present invention is optimal for a hot forging die material, but is not limited to a hot forging die, and can be applied to applications where compressive stress is applied hot.
以下に実施例を挙げて本発明を具体的に説明するが、本発明はこれらの実施例に制限されるものではない。 EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.
＜実施例１、２および比較例１〜４＞
真空中で誘導溶解により原料を溶解し、金型に鋳造して、表１に示す成分で底面が１辺約８０ｍｍの正方形、上面が１辺約９０ｍｍの正方形、高さ約１３０ｍｍの角型形状のインゴットを得た。
<Examples 1 and 2 and Comparative Examples 1 to 4>
The raw material is melted by induction melting in a vacuum, cast into a mold, and the components shown in Table 1 have a square shape with a bottom of about 80 mm on one side, a square with about 90 mm on one side, and a height of about 130 mm. Got the ingot.
＜実施例３＞
真空中で誘導溶解により原料を溶解し、鋳型として５００℃に加熱した砂型を用いて鋳造し、直径１１０〜１６０ｍｍ、長さ５１５ｍｍの所定成分のインゴットを得た。
<Example 3>
The raw material was melted by induction melting in vacuum and cast using a sand mold heated to 500 ° C. as a mold to obtain an ingot of a predetermined component having a diameter of 110 to 160 mm and a length of 515 mm.
＜比較例５および６＞
大気下で溶解および鋳造したこと以外は実施例１と同様にして所定成分のインゴットを得た。なお、比較例６はＭａｒ−Ｍ２００合金相当成分である。
<Comparative Examples 5 and 6>
An ingot of a predetermined component was obtained in the same manner as in Example 1 except that it was melted and cast under the atmosphere. Comparative Example 6 is a component equivalent to Mar-M200 alloy.
＜比較例７＞
粉末冶金法で製造された市販のＴＺＭ合金を評価した。
<Comparative Example 7>
A commercial TZM alloy produced by powder metallurgy was evaluated.
（鋳造割れ）
実施例１−３及び比較例１−５で得られたインゴットの略中心を通るように長手方向に切断し、浸透探傷法（カラーチェック）により断面における内部割れ（鋳造割れ）の発生を評価した。
なお、比較例２で得たインゴットにおける割れを基準とし、割れが発生しなかった場合はＡ、割れが発生したが比較例２よりも割れが明らかに少ない場合はＢ、比較例２と同等レベルで割れが発生した場合はＣ、比較例２よりも割れが明らかに多かった場合はＤとして評価した。
図１〜図３は、比較例２、比較例４、実施例２でそれぞれ得られたインゴットの断面を示している。
(Casting crack)
Cut in the longitudinal direction so as to pass through the approximate center of the ingot obtained in Example 1-3 and Comparative Example 1-5, and evaluated the occurrence of internal cracks (casting cracks) in the cross section by the penetrant flaw detection method (color check). .
In addition, on the basis of the crack in the ingot obtained in Comparative Example 2, A when the crack did not occur, B when crack occurred but the crack was clearly less than Comparative Example 2, B, the level equivalent to Comparative Example 2 In the case where cracks occurred, C was evaluated, and in the case where cracks were clearly more than Comparative Example 2, D was evaluated.
1 to 3 show cross sections of the ingots obtained in Comparative Example 2, Comparative Example 4, and Example 2, respectively.
実施例及び比較例で得られたインゴットの組成及び割れの評価結果を表１に示す。
Ｏ以外の成分の含有量は質量％、Ｏの含有量の単位はｐｐｍであり、Ｂａｌは残部を意味する。また、表１において「−」は、分析を行わなかったこと意味する。
なお、比較例６、７のインゴットは、実施例のインゴットの高温機械的性質及び耐酸化性を比較評価するために用意したものであり、割れの評価は行わなかった。
Table 1 shows the composition and crack evaluation results of the ingots obtained in the examples and comparative examples.
The content of components other than O is mass%, the unit of the content of O is ppm, and Bal means the balance. In Table 1, “-” means that no analysis was performed.
The ingots of Comparative Examples 6 and 7 were prepared for comparative evaluation of the high-temperature mechanical properties and oxidation resistance of the ingots of Examples, and cracks were not evaluated.
表１に示すように、Ｗの含有量が１０．３０〜１１．００質量％、Ｍｏの含有量が９．００〜１１．００質量％、Ａｌの含有量が５．８０〜６．８０質量％、及び、Ｙの含有量が０．０２質量％以下である実施例１、２のＮｉ基鋳造合金インゴットは、比較例１−５のＮｉ基鋳造合金インゴットに比べて割れの発生が少なく、実施例３のＮｉ基鋳造合金インゴットでは割れが観察されなかった。 As shown in Table 1, the W content is 10.30 to 11.00 mass%, the Mo content is 9.00 to 11.00 mass%, and the Al content is 5.80 to 6.80 mass%. %, And the content of Y is 0.02% by mass or less, the Ni-base cast alloy ingots of Examples 1 and 2 have less cracking than the Ni-base cast alloy ingot of Comparative Example 1-5. In the Ni-base cast alloy ingot of Example 3, no cracks were observed.
（高温機械的性質）
実施例２、３及び比較例６、７のインゴットから、直径１０ｍｍ×長さ１２ｍｍの試験片Ａと、直径１０ｍｍ×長さ２０ｍｍの試験片Ｂをそれぞれ切り出した。
試験片Ａを用い、１１００℃、歪速度１０−３／ｓで１０％までの圧縮試験及び１１００℃、１０ｋｇｆ／ｍｍ２で２０時間までの圧縮クリープ試験を行った。なお、クリープ試験は実施例３と比較例６の各試験片Ｂに対して行った。
結果を下記表２に示す。
(High temperature mechanical properties)
A test piece A having a diameter of 10 mm × a length of 12 mm and a test piece B having a diameter of 10 mm × a length of 20 mm were cut out from the ingots of Examples 2 and 3 and Comparative Examples 6 and 7, respectively.
Using the test piece A, a compression test up to 10% at 1100 ° C. and a strain rate of 10 −3 / s and a compression creep test up to 20 hours at 1100 ° C. and 10 kgf / mm 2 were performed. The creep test was performed on each test piece B of Example 3 and Comparative Example 6.
The results are shown in Table 2 below.
（耐酸化性）
さらに、実施例２、３、比較例６の各試験片Ｂを用い、１１００℃×１６時間の空冷なる加熱冷却を５回繰り返す耐酸化試験を行って酸化減量を測定した。
実施例２、３の試験片Ｂの酸化減量は、比較例６の試験片Ｂの酸化減量に比べほぼ同等レベルであり、大気中の熱間鍛造金型として使用しても問題ないレベルであった。
(Oxidation resistance)
Furthermore, using each test piece B of Examples 2 and 3 and Comparative Example 6, an oxidation resistance test was performed by repeating heating and cooling at 1100 ° C. × 16 hours for 5 times to measure oxidation loss.
The oxidation weight loss of the test piece B of Examples 2 and 3 is almost the same level as the oxidation weight loss of the test piece B of Comparative Example 6, and it is a level that can be used as a hot forging die in the atmosphere. It was.
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| JPWO2019065542A1 (en) * | 2017-09-29 | 2019-12-19 | 日立金属株式会社 | Manufacturing method of hot forging |
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