Topic
Maraging steel
About: Maraging steel is a research topic. Over the lifetime, 1728 publications have been published within this topic receiving 19886 citations. The topic is also known as: martensitic ageing steel.
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TL;DR: In this article, the fracture toughness of maraging steel in the solution temperature range of 1083-1483 K was investigated on the base of TEM examination of microstructure in both solution and aging conditions, along with phase transformation and SEM fractographic analysis.
Abstract: Variation of fracture toughness (K-IC) of an ultra-purified 18Ni (350) maraging steel in the solution temperature range of 1083-1483 K was investigated, and its mechanism was discussed on the base of TEM examination of microstructure in both solution and aging conditions, along with phase transformation and SEM fractographic analysis. The results show that the value of. KIC consistently increases with increasing solution temperature or coarsening of prior austenite grain, and there is no thermal embrittlement resulted from segregation of Ti(C,N) at high solution temperature. Solution treated maraging steel consists of invariable martensite lathes. In aging process, the segregation of precipitates Ni-3 (Mo,Ti) at the prior austenite grain boundaries and lath boundaries becomes more and more serious with the increase of solution temperature or coarsening of prior austenite grain, which leads to the martensite matrix softening and the reverted austenite forms because of enrichment of Ni and Mo at the prior austenite grain boundaries and lath boundaries. The softening matrix and reverted austenite blunt the crack tip and prevent its propagation, so the maraging steel shows a dimpled transgranular fracture and good toughness after high temperature solution treatment.
8 citations
TL;DR: In this article, the authors discuss the effect of gender stereotypes on gender stereotypes in the context of gender discrimination in the media.1)これは主として,材料中に含まれる,
Abstract: 1 緒 言 高強度鋼になると,硬さと疲労限度間の比例関係は成 立せず,硬さが上昇しても疲労限度は上昇しないかもし くは逆に低下する.1)これは主として,材料中に含まれる 各種欠陥と高い切欠き感度に起因した現象であるが,2), 3) それに加えて強度が高くなるほど大気中の湿度に敏感に なること 4), 5)も影響していると考えられる.一方,高強 度鋼にショットピーニング処理を行えば,破壊の起点は, 応力レベルの低下に伴ない材料表面から内部に変化する ことが多い.6)~ 8)しかし内部破壊の場合も切欠き感度の点 からは,素材硬さの上昇に対する疲労強度の上昇は表面 破壊の場合と同じ傾向を示すものと考えられる.しかし 内部破壊の場合,疲労限度の有無を含め破壊機構の詳細 は明らかでないこと,9)~ 14)さらに前述のように,表面と 内部における大気湿度を含む環境の相違を考えると,表 面破壊とは異なる疲労強度の硬さ依存性を示すことが考 えられる. そこで本研究では,実用鋼のバルク材中で最も強度の 高いマルエージング鋼を用いて時効条件を変えることに より,素材硬さを変えた試験片を準備し,電解研磨材と ショットピーニング材の回転曲げ疲労試験を行い,表面 破壊と内部破壊に対する疲労強度の硬さ依存性について 検討した. 2 材料,試験片および実験方法 用いた材料は,市販の 2種類の 18%Niマルエージング 鋼(300gradeと 350grade)である.Table 1に両材の 化学成分を示す.納入材を真空中で 1123K,5.4ks加熱の 溶体化処理後空冷し,Fig. 1に示す形状と寸法をもつ試 験片を作成した.機械加工した試験片に Table 2に示す 条件で時効処理を行った.Table 2には,時効後の各材 の機械的性質も併せて示す.時効条件として選んだ温度 硬さレベルを変えたマルエージング鋼の疲労強度に 及ぼすショットピーニングの影響 永 野 茂 憲 皮籠石 紀 雄 森 山 三千彦 陳 強 長 島 悦 一 ● ● ●●● Influence of Shot Peening on Fatigue Strength of Maraging Steels with Different Hardness
8 citations
TL;DR: In this article, a post-welding of 5mm-thick maraging steel plates using ErNiCrMo-3 filler wire was done to evaluate the weldability and performance characteristics.
8 citations
01 Jan 1981
TL;DR: In this paper, the strength and ductility of an austenitic, a quenched and tempered and a maraging steel were investigated under tension over a wide range of strain rates till 5000 1/s using hydraulic, pendulum and fly wheel machines.
Abstract: The strength and the ductility of an austenitic, a quenched and tempered and a maraging steel were investigated under tension over a wide range of strain rates till 5000 1/s using hydraulic, pendulum and fly wheel machines.
8 citations
07 Jun 1966
TL;DR: Stresswave emission in fatigue crack propagation of nickel maraging steel and of low alloy steel was studied in this paper, showing that low-alloyed steel exhibits higher stress wave emission than high alloy steel.
Abstract: Stress-wave emission in fatigue crack propagation of nickel maraging steel, and of low alloy steel
8 citations