JP5052796B2 - Method for producing Ni-based alloy wire or bar - Google Patents
Method for producing Ni-based alloy wire or bar Download PDFInfo
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- JP5052796B2 JP5052796B2 JP2006028491A JP2006028491A JP5052796B2 JP 5052796 B2 JP5052796 B2 JP 5052796B2 JP 2006028491 A JP2006028491 A JP 2006028491A JP 2006028491 A JP2006028491 A JP 2006028491A JP 5052796 B2 JP5052796 B2 JP 5052796B2
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この発明は、Ｎｉ基合金鋳塊から圧延により線または棒を製造する方法に関するものであり、特に、Ｎｉ基合金鋳塊から表面割れのない線または棒を製造する方法に関するものである。 The present invention relates to a method of manufacturing a wire or a rod from a Ni-based alloy ingot by rolling, and particularly relates to a method of manufacturing a wire or a rod having no surface cracks from a Ni-based alloy ingot.
一般に、Ｎｉ基合金の線または棒を製造するには、先ず、Ｎｉ基合金を真空溶解し鋳造し、必要に応じてエレクトロスラグ再溶解して鋳塊を作製し、この鋳塊を１１５０〜１２３０℃に保持することにより均質化処理を施し、この均質化処理を施したＮｉ基合金鋳塊をロール表面に大径から小径に溝径が異なる溝を有する溝ロールに往復動させながら通過させることにより熱間溝ロール圧延を施して順次径を細くしながら所望の径を有するＮｉ基合金の線または棒を製造していた（特許文献１参照）。
しかし、均質化処理されたＮｉ基合金鋳塊をそのまま溝ロール圧延して得られたＮｉ基合金の線または棒の表面には微細な割れが生成し、表面割れのない健全なＮｉ基合金の線または棒を得ることは難しかった。この表面割れの発生を防止するために、均質処理されたＮｉ基合金鋳塊を熱間鍛造して減面率が５０％程度にまでになった中間鍛造体の表面を研削して中間鍛造体の表面に形成されている表面割れを除去し、表面割れを除去した中間鍛造体を熱間溝ロール圧延することにより表面割れのない健全なＮｉ基合金の線または棒を製造することも行われていた。しかし、中間鍛造材の表面に発生している割れを肉眼で探して研削することは困難でありまた時間もかかるのでコスト高になるという問題点があった。 However, fine cracks are formed on the surface of the Ni-based alloy wire or rod obtained by rolling the Ni-based alloy ingot that has been homogenized as it is, and a healthy Ni-based alloy with no surface cracks is produced. It was difficult to get a line or bar. In order to prevent the occurrence of this surface crack, the intermediate forged body is ground by hot forging a Ni-based alloy ingot that has been subjected to homogenization to grind the surface of the intermediate forged body having a reduction in surface area of about 50%. It is also possible to produce a healthy Ni-based alloy wire or rod without surface cracks by removing the surface cracks formed on the surface of the steel and rolling the intermediate forging from which the surface cracks have been removed by hot groove rolling. It was. However, it is difficult to grind and grind cracks occurring on the surface of the intermediate forging material with the naked eye, and it takes time, which increases the cost.
そこで、本発明者等は、途中で研削を施すことなく表面割れのないＮｉ基合金の線または棒を簡単に製造すべく研究を行った。その結果、均質化処理したＮｉ基合金鋳塊に減面率：５〜２０％の熱間軽鍛造を施し、次いで得られた熱間軽鍛造体を熱間溝ロール圧延することにより得られたＮｉ基合金の線または棒の表面には表面割れが発生することはない、という知見を得たのである。ここで、均質化処理したＮｉ基合金鋳塊に減面率とは断面径減少率のことであって、均質化処理したＮｉ基合金鋳塊の径をＸ、熱間軽鍛造後の径をＹとすると、減面率（％）＝（Ｘ２−Ｙ２）／Ｘ２×１００で定義されるものである。 Therefore, the present inventors conducted research to easily manufacture Ni-based alloy wires or rods without surface cracking without grinding in the middle. As a result, it was obtained by subjecting the homogenized Ni-base alloy ingot to hot light forging with a surface reduction ratio of 5 to 20%, and then hot rolling the obtained hot forged body. They have found that surface cracks do not occur on the surface of Ni-based alloy wires or rods. Here, the area reduction rate of the homogenized Ni-based alloy ingot is the reduction rate of the cross-sectional diameter, and the diameter of the homogenized Ni-based alloy ingot is X, the diameter after hot light forging. When Y is defined, the area reduction rate (%) = (X 2 −Y 2 ) / X 2 × 100.
この発明は、かかる知見に基づいてなされたものであって、
（１）Ｃｕ及びＴｉを含有しないＮｉ基合金鋳塊を１２００〜１２３０℃で均質化処理し、均質化処理したＮｉ基合金鋳塊を減面率：５〜２０％の範囲内の熱間軽鍛造を施し、次いで得られた熱間軽鍛造体を熱間溝ロール圧延するＮｉ基合金の線または棒の製造方法、に特徴を有するものである。
This invention has been made based on such knowledge,
(1) A Ni-based alloy ingot containing no Cu and Ti is homogenized at 1200 to 1230 ° C , and the homogenized Ni-based alloy ingot is hot reduced within a range of 5-20%. It is characterized by a method for producing a Ni-based alloy wire or rod in which forging is performed and then the obtained hot light forged body is hot-rolled by roll rolling.
この発明において、Ｎｉ基合金鋳塊を均質化処理する温度は１１５０〜１２３０℃であり、この均質化処理温度はＮｉ基合金鋳塊を均質化処理する温度として通常知られている温度である。また、この発明のＮｉ基合金の線または棒の製造方法において使用するＮｉ基合金鋳塊はその寸法は特に限定されるものではないが、通常のＮｉ基合金鋳塊よりも小径であることが好ましく、直径：８０〜１００ｍｍの範囲内にあることが一層好ましい。この直径：８０〜１００ｍｍの範囲内にある小径のＮｉ基合金鋳塊を均質化処理したのち熱間溝ロール圧延して得られるＮｉ基合金の線または棒の径は特に限定されるものではないが６〜３０ｍｍの範囲内にあることが一層好ましい。 In this invention, the temperature at which the Ni-based alloy ingot is homogenized is 1150-1230 ° C., and this homogenizing temperature is a temperature generally known as the temperature at which the Ni-based alloy ingot is homogenized. Further, the Ni-based alloy ingot used in the method for manufacturing a Ni-based alloy wire or rod according to the present invention is not particularly limited in size, but may be smaller in diameter than a normal Ni-based alloy ingot. The diameter is more preferably in the range of 80 to 100 mm. The diameter of the Ni-based alloy wire or rod obtained by homogenizing a small-diameter Ni-base alloy ingot in the diameter range of 80 to 100 mm and then hot rolling is not particularly limited. Is more preferably in the range of 6 to 30 mm.
したがって、この発明は、
（２）前記Ｎｉ基合金鋳塊は直径が８０〜１００ｍｍを有する小径のＮｉ基合金鋳塊である前記（１）記載のＮｉ基合金の線または棒の製造方法、に特徴を有するものである。
Therefore, the present invention
(2) The Ni-based alloy ingot is characterized by the Ni-based alloy wire or rod manufacturing method according to (1), which is a small-diameter Ni-base alloy ingot having a diameter of 80 to 100 mm. .
この発明において、１２００〜１２３０℃で均質化処理したＣｕ及びＴｉを含有しないＮｉ基合金鋳塊を減面率：５〜２０％の範囲内の熱間軽鍛造を行うと得られたＮｉ基合金の線または棒の表面に割れが発生しない理由は、熱間溝ロール圧延前に軽度の鍛造を行うと、得られたＮｉ基合金鋳塊の熱間軽鍛造表面部分における組織が再結晶化して微細化し、表面部分の延性が増して熱間溝ロール圧延時に表面割れが発生しなくなるものと考えられる。均質化処理したＮｉ基合金鋳塊を熱間軽鍛造する際の減面率が５％未満では減面率が小さすぎてＮｉ基合金鋳塊表面の組織が十分に微細化せず、そのために熱間溝ロール圧延時に表面割れが発生するので好ましくなく、一方、減面率が２０％を越えるように鍛造すると、この時の鍛造により新たな表面割れが発生するので好ましくないことによるものである。
In this invention, a Ni-based alloy obtained by subjecting a Ni-based alloy ingot that does not contain Cu and Ti homogenized at 1200 to 1230 ° C. to hot light forging within a range of 5 to 20% reduction in area. The reason why cracks do not occur on the surface of the wire or rod is that when light forging is performed before hot groove roll rolling, the structure in the hot light forging surface portion of the obtained Ni-based alloy ingot is recrystallized. It is considered that the surface cracks are reduced and the surface cracks are not generated during hot groove roll rolling. If the area reduction rate during hot light forging of the homogenized Ni-base alloy ingot is less than 5%, the area reduction rate is too small and the structure of the Ni-base alloy ingot surface is not sufficiently refined. It is not preferable because surface cracks occur during hot groove roll rolling, and on the other hand, forging such that the area reduction rate exceeds 20%, it is not preferable because new surface cracks are generated by forging at this time. .
この発明によると、１２００〜１２３０℃で均質化処理したＣｕ及びＴｉを含有しないＮｉ基合金鋳塊に熱間軽鍛造を施すだけで表面割れのないＮｉ基合金の線または棒を製造することができるので、製造コストを低く抑えることができる。
According to the present invention, a Ni-based alloy wire or rod free from surface cracks can be produced simply by hot forging a Ni-based alloy ingot containing no Cu and Ti homogenized at 1200 to 1230 ° C. Therefore, the manufacturing cost can be kept low.
真空溶解することによりＣｒ：２０．５質量％、Ｃｏ：０．５質量％、Ｆｅ：１７．０質量％、Ｍｏ：８．０質量％、Ｗ：０．２質量％、Ｃ：０．０５質量％を含有し、残部がＮｉおよび不可避不純物からなる成分組成を有し、直径：８０ｍｍ、長さ：１０００ｍｍの寸法を有するＮｉ基合金鋳塊を作製し用意した。
このＮｉ基合金鋳塊を温度：１２００℃、１０時間保持することにより均質化処理を施し、この均質化処理を施したＮｉ基合金鋳塊を表１に示される減面率となるように熱間軽鍛造を行い、ついで熱間溝ロール圧延を施すことにより直径：９．５ｍｍを有するＮｉ基合金棒を作製し、本発明法１〜７および比較法１〜２を実施した。さらに均質化処理を施したＮｉ基合金鋳塊に熱間軽鍛造を施すことなく均質化処理を施したＮｉ基合金鋳塊を直接熱間溝ロール圧延することにより直径：９．５ｍｍを有するＮｉ基合金棒を作製し、従来法１を実施した。本発明法１〜７、比較法１〜２および従来法１で得られたＮｉ基合金棒の表面を染色探傷し、Ｎｉ基合金棒の表面に割れが発生しているか否かを調べ、その結果を表１に示した。
By melting in vacuum, Cr: 20.5 mass%, Co: 0.5 mass%, Fe: 17.0 mass%, Mo: 8.0 mass%, W: 0.2 mass%, C: 0.05 A Ni-based alloy ingot containing a mass%, having a component composition consisting of Ni and inevitable impurities, and having a diameter of 80 mm and a length of 1000 mm was prepared and prepared.
The Ni-based alloy ingot is subjected to a homogenization treatment by holding the Ni-base alloy ingot for 10 hours at a temperature of 1200 ° C., and the Ni-base alloy ingot subjected to the homogenization treatment is heated so as to have a surface reduction rate shown in Table 1. Ni-based alloy rods having a diameter of 9.5 mm were prepared by performing light forging and then hot groove roll rolling, and the present invention methods 1 to 7 and comparative methods 1 to 2 were carried out. Further, Ni having a diameter of 9.5 mm is obtained by directly rolling the Ni-based alloy ingot subjected to the homogenization without hot light forging to the Ni-based alloy ingot subjected to the homogenization directly by hot groove rolling. A base alloy rod was prepared and the conventional method 1 was carried out. The surface of the Ni base alloy rod obtained by the present invention methods 1 to 7, comparative methods 1 and 2 and the conventional method 1 is subjected to dyeing flaw detection, and whether or not cracks are generated on the surface of the Ni base alloy rod is investigated. The results are shown in Table 1.
表１に示される結果から、１２００〜１２３０℃で均質化処理したＣｕ及びＴｉを含有しないＮｉ基合金鋳塊に熱間軽鍛造を施す本発明法１〜７により得られたＮｉ基合金棒の表面には割れが発生することはないが、均質化処理したＮｉ基合金鋳塊に熱間軽鍛造を施すことなく熱間溝ロール圧延した従来法１およびこの発明の範囲から外れた減面率で熱間軽鍛造を施す比較法１〜２により得られたＮｉ基合金棒の表面には割れが発生することがわかる。
From the results shown in Table 1, the Ni-base alloy rods obtained by the present invention methods 1 to 7 that hot hot forge the Ni-base alloy ingot containing no Cu and Ti homogenized at 1200 to 1230 ° C. Although the surface does not crack, the conventional method 1 in which the homogenized Ni-base alloy ingot was hot-rolled without hot light forging and the reduction in area outside the scope of the present invention It can be seen that cracks occur on the surfaces of the Ni-based alloy bars obtained by Comparative Methods 1 and 2 in which hot light forging is performed.
Claims (2)
2. The Ni-based alloy wire or rod manufacturing method according to claim 1, wherein the Ni-based alloy ingot is a small-diameter Ni-base alloy ingot having a diameter of 80 to 100 mm.
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| WO2010038680A1 (en) * | 2008-09-30 | 2010-04-08 | 日立金属株式会社 | Process for manufacturing ni-base alloy and ni-base alloy |
| CN112275796B (en) * | 2020-09-03 | 2023-03-24 | 太原钢铁(集团)有限公司 | Method for improving rolling surface quality of nickel-based alloy wire |
| CN114472514A (en) * | 2022-02-08 | 2022-05-13 | 西安聚能高温合金材料科技有限公司 | Method for rolling homogeneous fine-grained bar of high-temperature alloy GH4720Li difficult to deform |
| CN116060440B (en) * | 2023-03-06 | 2023-06-20 | 太原科技大学 | Nickel-based alloy wire rod and preparation method thereof |
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