Search Results - "Kömi, Jukka"

Effect of microstructure on mechanical properties of a novel high-Mn TWIP stainless steel bearing vanadium by Hamada, Atef, Kömi, Jukka

“…A novel TWIP-type stainless steel bearing vanadium was designed based on stacking fault energy calculations. The strength properties of the steel were…”
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Flow stress characteristics and design of innovative 3-steps multiphase control thermomechanical processing to produce ultrafine grained bulk steels by Ghosh, Sumit, Kömi, Jukka, Mula, Suhrit

“…In the present study, at first flow behavior of Nb–Ti microalloyed and interstitial-free (IF) steels was investigated to know the effects of processing…”
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Promotion of thermomechanical processing of 2-GPa low-alloyed ultrahigh-strength steel and physically based modelling of the deformation behaviour by Ali, Mohammed, Khosravifard, Ali, Hamada, Atef, Mattar, Taha, Eissa, Mamdouh, Kömi, Jukka

“…A low-alloyed ultrahigh-strength steel comprising CrNiMoWMnV was designed based on thermodynamic calculations and by controlling the microalloying elements to…”
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Effect of tempering on the impact-abrasive and abrasive wear resistance of ultra-high strength steels by Haiko, Oskari, Valtonen, Kati, Kaijalainen, Antti, Uusikallio, Sampo, Hannula, Jaakko, Liimatainen, Tommi, Kömi, Jukka

“…Tempering is an essential part in the fabrication of ultra-high strength steels and it is also widely applied in the processing of wear-resistant steels. In…”
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Characteristics of carbide-free medium-carbon bainitic steels in high-stress abrasive wear conditions by Haiko, Oskari, Kaikkonen, Pentti, Somani, Mahesh, Valtonen, Kati, Kömi, Jukka

“…This study encompasses a comprehensive account of the abrasive wear properties of carbide-free, ultrahigh-strength bainitic steels processed through ausforming…”
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Investigation of second phase concentration effects on tribological and electrical properties of Cu–WS2 composites by Freschi, Marco, Di Virgilio, Matteo, Haiko, Oskari, Mariani, Marco, Andena, Luca, Lecis, Nora, Kömi, Jukka, Dotelli, Giovanni

“…In this preliminary study, a set of self-lubricating copper-tungsten disulfide (Cu-WS2) composites are prepared via a powder metallurgy route to analyze the…”
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High-stress abrasive wear performance of medium-carbon direct-quenched and partitioned, carbide-free bainitic, and martensitic steels by Haiko, Oskari, Pallaspuro, Sakari, Javaheri, Vahid, Kaikkonen, Pentti, Ghosh, Sumit, Valtonen, Kati, Kaijalainen, Antti, Kömi, Jukka

“…Experimental steels, a direct-quenched and partitioned (DQP) steel and a carbide-free bainitic steel (CFB), were tested along with a commercial martensitic 500…”
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On the role of grain size on slurry erosion behavior of a novel medium-carbon, low-alloy pipeline steel after induction hardening by Javaheri, Vahid, Haiko, Oskari, Sadeghpour, Saeed, Valtonen, Kati, Kömi, Jukka, Porter, David

“…Grain refinement has been widely used to enhance the hardness and toughness properties of metallic materials. However, the effect of prior austenite grain…”
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Comparison of impact-abrasive wear characteristics and performance of direct quenched (DQ) and direct quenched and partitioned (DQ&P) steels by Haiko, Oskari, Somani, Mahesh, Porter, David, Kantanen, Pekka, Kömi, Jukka, Ojala, Niko, Heino, Vuokko

“…The recently developed method of direct quenching and partitioning (DQ&P) was utilized to produce ultra-high strength martensitic steels with retained…”
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Impact of niobium addition and non-metallic inclusions’ characteristics on the microstructure and mechanical properties of low-carbon CrNiMnMoB ultrahigh-strength steel: A comprehensive investigation by Ali, Mohammed, Alatarvas, Tuomas, Kömi, Jukka

“…The effect of cooling rate and Nb addition on the phase transformation, microstructures, and mechanical properties of thermomechanically controlled hot-rolled…”
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Controlled cold rolling effect on microstructure and mechanical properties of Ce-modified SAF 2507 super duplex stainless steel by Zhou, Tian, Xiong, Yi, Yue, Yun, Lu, Yan, Chen, Yan-na, He, Tian-tian, Ren, Feng-zhang, Singh, Harishchandra, Kömi, Jukka, Huttula, Marko, Cao, Wei

“…Controlled cold rolling impacts on microstructure and mechanical properties of the rare earth Ce-modified SAF 2507 super duplex stainless steel (SDSS) are…”
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Effect of microstructure on the impact toughness transition temperature of direct-quenched steels by Pallaspuro, Sakari, Kaijalainen, Antti, Mehtonen, Saara, Kömi, Jukka, Zhang, Zhiliang, Porter, David

“…A sufficient level of toughness at low temperatures is paramount for the use of structural steels intended for arctic applications. Therefore, it is important…”
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Sensitization and Self-healing in Austenitic Stainless Steel: Quantitative Prediction Considering Carbide Nucleation and Growth by Kolli, Satish, Ohligschläger, Thomas, Kömi, Jukka, Porter, David

“…The degree of sensitization in an austenitic stainless steel, has been measured using double loop electrochemical reactivation tests, and the measured values…”
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Competitive mechanisms occurring during quenching and partitioning of three silicon variants of 0.4 wt.% carbon steels by Miettunen, Ilkka, Ghosh, Sumit, Somani, Mahesh C., Pallaspuro, Sakari, Kömi, Jukka

“…Quenching and partitioning (Q&P) treated steels are traditionally alloyed with silicon (Si), but its precise role on microstructural mechanisms occurring…”
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Effect of austenite grain structure on the strength and toughness of direct-quenched martensite by Kaijalainen, Antti J., Suikkanen, Pasi P., Limnell, Teijo J., Karjalainen, Leo P., Kömi, Jukka I., Porter, David A.

“…► Austenite pancaking is an effective way to improve the strength and toughness. ► Austenite pancaking decreases the volume fraction of martensite. ►…”
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Effects of local grain size and inclusions on the low-temperature toughness of low-carbon as-quenched martensite by Pallaspuro, Sakari, Mehtonen, Saara, Kömi, Jukka, Zhang, Zhiliang, Porter, David

“…The segregation of alloying elements that occurs during the solidification of steel leads to microscale and macroscale microstructural heterogeneity that can…”
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Precipitation behavior of novel 1 GPa ferritic advanced high strength steels by Nousiainen, Olli, Hannula, Jaakko, Saukko, Sami, Kaijalainen, Antti, Kömi, Jukka

“…The precipitation of nanosized carbides in the hot-deformed low-alloy Ti-Mo-V-Nb and Ti-Mo-V- steels during the isothermal dwell at three different…”
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Promising bending properties of a new as-rolled medium-carbon steel achieved with furnace-cooled bainitic microstructures by Javaheri, Vahid, Pallaspuro, Sakari, Kaijalainen, Antti, Sadeghpour, Saeed, Kömi, Jukka, Porter, David

“…The bending properties of a new thermomechanically processed medium-carbon (0.40 wt% C) low-alloy steel, intended for the slurry transportation pipeline…”
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Ultrasonic vibration-induced severe plastic deformation of Cu foils: effects of elastic-plastic stress wave bounce, acoustic softening, and size effect by Chen, Zhihao, Liu, Chao, Rani, Ekta, Singh, Harishchandra, Huttula, Marko, Kömi, Jukka, Cao, Wei

“…In this work, the unique plastic deformation behavior of T2 rolled copper foils under ultrasonic impact (UI) and ultrasonic rolling (UR) has been studied…”
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The effect of phase stability on the grain growth behavior of beta titanium alloys by Sadeghpour, Saeed, Javaheri, Vahid, Abbasi, Seyed Mahdi, Kömi, Jukka

“…The grain growth kinetics of two beta titanium alloys, Ti–4733 and Ti–5553 was studied over a temperature range of 850 °C–1000 °C. The more stable alloy i.e…”
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