Effect of Cooling Rate and Austenite Deformation on Hardness and Microstructure of 960MPa High Strength Steel

Yang, Xiong; Yu, Wan-Chin; Tang, Di; Shi, Jiaxin; Li, Yuqian; Fan, Jie; Mei, Donggui; Du, Qiming

doi:10.1515/secm-2020-0045

Cited by 16 publications

(10 citation statements)

References 10 publications

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“…The size of the martensite lath was gradually refined with an increase in cooling rate of 10-40 C/s so that many entangled dislocations were distributed within the martensite lath boundary [21]. Rapid cooling rates (aqueous medium or exceeding 10 C/s) tend to produce martensite lath, while fairly fast cooling rates (oil media) allow the transformation of lower bainite or martensite to larger/coarse sizes.…”

Section: Microstructure and Hardness Analysismentioning

confidence: 99%

Effect of forging load and heat treatment process on the corrosion behavior of A588-1%NI for weathering steel application in a marine environment

Rohmah¹,

Paristiawan²,

Romijarso³

2022

Sinergi

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The study focused on the effect of forging load and heat treatment on the corrosion behavior of A588-1%Ni weathered steel. The samples used were hot forged steel (A588%-1%Ni) with a load of 50 tons and 75 tons at a temperature of 800-850 °C. The test sample was reheated at an intercritical temperature between A3–A1, around 780 °C, held for 1 hour, and then cooled to room temperature. The cooling media used are water, oil, and open air. Forging loads and heat treatment variation affect the microstructure and corrosion rate of A588-1%Ni. Based on the metallographic test and after the hot forging process, A588-1%Ni laterite steel has a microstructure as ferrite-perlite. Then, after heat treatment as ferrite and cementite-containing phase, pearlite, bainite, or martensite may very well. Cooling water delivers a uniformly distributed lath martensite with an acicular ferrite phase. In addition, the oil media creates bainite with an acicular ferrite phase coarser size. The open-air media produces a pearlite + ferrite phase. Corrosion behavior of laterite steel subjected to hot forging process and followed by heat treatment was evaluated in 3% NaCl solution. Oil cooling with bainite-ferrite microstructure has the lowest corrosion rate, which is 11.96x10-3 mmpy.

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Section: Microstructure and Hardness Analysismentioning

confidence: 99%

Effect of forging load and heat treatment process on the corrosion behavior of A588-1%NI for weathering steel application in a marine environment

Rohmah¹,

Paristiawan²,

Romijarso³

2022

Sinergi

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“…The metastable phase depends on the nonequilibrium cooling, the chemical composition, and section size of the forging [13]. Martensite lath has gradually been refined with the cooling rate increase [14]. In the moderate cooling rate (oil quenchant), Fig 3(c,d) comprise of acicular bainite and ferrite.…”

Section: Ramentioning

confidence: 99%

“…Mo can decrease the ferrite transformation temperature but increase the diffusion activation energy of carbon in austenite and reduce the diffusion coefficient of carbon. It can also effectively promote the formation of acicular ferrite [14].…”

Section: Ramentioning

confidence: 99%

CORROSION BEHAVIOR OF LOW ALLOY Ni-Cr-Mo STEEL AFTER HOT FORGING FOLLOWED BY INTERCRITICAL HEATING FOR WEATHERED RESISTANT FASTENER

Rohmah¹,

Pandhita

Chandra³

2022

JRM

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Low Ni-Cr-Mo alloys is developed by thermomechanical process to obtain high strength, toughness, and great hardenability properties. the aim of this study is to determine the correlation between the microstructure and corrosion properties after hot forging and followed by intercritical heating with cooling rate variation. Low Ni-Cr-Mo steel was homogenized, hot forgings at 950℃, and heat treated at 880℃ with three cooling variations by water, oil, and air. Intercritical heating makes a dual-phase structure. Metallorgaphy and hardness test is confirmed a mechanical properties. OCP and cyclic polarization test is confirmed a corrosion behavior. As the fast-cooling (water quenchant) show the lath martensite, bainite, and a few of acicular ferrite. The hardness of the 75-ton result is slightly lower than the 50-ton load, is reached 591±9.4 VHN for 75-ton and 597±15.6 VHN for 50-ton. Polarization test resulted corrosion resistance sample with 100 ton forging water quench has a high corrosion rate 0.8 mpy, higher than air quench 0.01 mpy.

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“…M s of 960 MPa grade high strength steel is about 443 °C, the critical cooling rate of martensitic transformation is about 10 °C/s, and M f is about 259 °C. Moreover, when the cooling rate is not above 3 °C/s, the austenite transformation product would be bainite and martensite, which would affect the strength of high strength steel, Table 1, Figure 1 [14].…”

Section: Numerical Simulation and Experimental Program 21 Direct Quen...mentioning

confidence: 99%

“…Studies have shown that for 960 MPa high strength steel, martensite begins to appear when the cooling rate > 3 °C/s, and full martensite can be obtained when the cooling rate � 10 °C/s [14,15]. When the final cooling temperature is below 300 °C, the strength of high strength steel can meet the requirements of � 960 MPa [16].…”

Section: Introductionmentioning

confidence: 99%

Effect of air cooling time on temperature and microstructure uniformity of 960 MPa high strength steel by direct quenching

Yang

Tang

et al. 2022

Materialwissenschaft Werkst

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In order to improve the temperature and microstructure uniformity in the thickness direction of online‐quenching 960 MPa high strength steel, the finite element software ADINA and the experiments have been used to analyze the effect of internal air cooling on temperature variation in the thickness direction during the online quenching process. The results showed that the interval air cooling could effectively improve the uniformity of temperature, microstructure and hardness in the direction of thickness of steel plate during the online quenching process. When air cooled for 3.2 s, the temperature difference between the surface and the core of the steel plate could be reduced by 90.13 %, and the cooling rate in the core could be reduced by about 85.20 % compared with continuous water cooling condition. The hardness difference between the surface and the core could reduce from 23 HV 5 to 5 HV 5. The internal air cooling process had an influence on the matensite lath morphology compared with continuous water cooling process. The microstructures with the different cooling conditions were martensite and the properties could still meet the requirements of 960 MPa high strength steel.

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Effect of Cooling Rate and Austenite Deformation on Hardness and Microstructure of 960MPa High Strength Steel

Cited by 16 publications

References 10 publications

Effect of forging load and heat treatment process on the corrosion behavior of A588-1%NI for weathering steel application in a marine environment

Effect of forging load and heat treatment process on the corrosion behavior of A588-1%NI for weathering steel application in a marine environment

CORROSION BEHAVIOR OF LOW ALLOY Ni-Cr-Mo STEEL AFTER HOT FORGING FOLLOWED BY INTERCRITICAL HEATING FOR WEATHERED RESISTANT FASTENER

Effect of air cooling time on temperature and microstructure uniformity of 960 MPa high strength steel by direct quenching

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