Effect of multi-stage heat treatment on mechanical properties and microstructure transformation of Ti–48Al–2Cr–2Nb alloy

In this paper, the microstructure evolution and mechanical properties fluctuation of Ti-6Al-2Zr-1Mo-1V forging state bar after the first stage heat treatment at 950℃~955℃ and the second stage heat treatment at 760℃~840℃ were studied. In the first stage of heat treatment, the content of primary α and the tensile strength decreases with the increase of temperature, and the high temperature duration time is obviously prolonged. During the second stage of heat treatment, the metastable β phase precipitates third α phase, and with the increase of temperature, the tensile strength increases and the high temperature duration time prolongs.

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Effect of a two-stage heat treatment process on the mechanical properties of full construction timber

Wood Material Science and Engineering ◽

10.1080/17480270801945439 ◽

2007 ◽

Vol 2 (3-4) ◽

pp. 138-146 ◽

Cited By ~ 13

Author(s):

M. J. Boonstra ◽

J. Van Acker ◽

E. Kegel

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Treatment Process ◽

Heat Treatment Process ◽

Two Stage ◽

Stage Heat Treatment

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The Effect Of Carbon Concentration On The Retained Austenite Content And The Mechanical Properties Of TRIP Steel Wire Rod Obtained From The Stelmor Controlled Cooling Line

Archives of Metallurgy and Materials ◽

10.1515/amm-2015-0331 ◽

2015 ◽

Vol 60 (3) ◽

pp. 1949-1952

Author(s):

Z. Muskalski ◽

S. Wiewiórowska

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Carbon Concentration ◽

Retained Austenite ◽

Steel Wire ◽

Controlled Cooling ◽

Two Stage ◽

Wire Rod ◽

Austenite Content ◽

Stage Heat Treatment

Abstract The austenite content of the multiphase TRIP-structure steels depends, inter alia, on the carbon concentration and the properly selected parameters of the two-stage heat treatment. Under the existing industrial conditions, it is possible to (approximately) reproduce approximately the optimal parameters of the two-stage wire rod heat treatment via the controlled wire rod cooling from the end temperature of rolling on the Stelmor line. The investigation of the retained austenite content of TRIP wire rods with a varying carbon concentration, produced under industrial conditions, has been discussed and the effect of the multiphase structure of these wire rods on their mechanical properties has been determined in the paper.

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The Effects of Multi-Stage Homogenizations on the Microstructures and Mechanical Properties of Al–Zn–Mg–Zr–Sc Alloys

Applied Sciences ◽

10.3390/app11020470 ◽

2021 ◽

Vol 11 (2) ◽

pp. 470

Author(s):

Yang-Chun Chiu ◽

Tse-An Pan ◽

Mien-Chung Chen ◽

Jun-Wei Zhang ◽

Hui-Yun Bor ◽

...

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Electron Microscope ◽

Electron Backscattered Diffraction ◽

Two Stage ◽

Homogenization Heat Treatment ◽

T6 Heat Treatment ◽

One Stage ◽

Multi Stage ◽

Better Than

This study is aimed at exploring the effects of multi-stage homogenization and trace amounts of Zr and Sc on the microstructures, mechanical properties, and recrystallization of Al–4.5Zn–1.5Mg alloys. The mechanical properties of the AA7005 aluminum alloys after the T6 heat treatment were evaluated through a hardness test and tensile test. The microstructures were analyzed by an optical microscope (OM), a differential scanning calorimeter (DSC), a transmission electron microscope (TEM), a scanning electron microscope (SEM), and electron backscattered diffraction (EBSD). The results show that the grain refinement effect of the as-cast, homogenized, and recrystallized Al–4.5Zn–1.5Mg alloy containing 0.05Sc (wt%) after the T6 heat treatment was more significant than that of the alloy containing 0.1Zr (wt%). In addition, compared with the aforementioned one-stage homogenization heat treatment, the two-stage homogenization made the dispersed grain phase (Al3Zr/Al3Sc) smaller. As a result, the T6 mechanical strength of the alloy after the two-stage homogenization heat treatment was better than that of the contrastive alloy after the one-stage homogenization heat treatment. However, the two different homogenization heat treatments caused a greater divergence between the sizes of the dispersed grain phases of the Al–4.5Zn–1.5Mg alloys containing Zr than between the sizes of the dispersed grain phases of the alloys containing Sc. Therefore, after the two-stage homogenization heat treatment, the alloy with 0.1Zr (wt%) promoted the mechanical properties better than the alloy with 0.05Sc (wt%).

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STUDY ON MECHANICAL PROPERTIES AND MICROSTRUCTURE OF 42CrMo4/NANOS-BA® HIGH-STRENGTH CLAD PLATES AFTER THE PROCESS OF HOT ROLLING AND TWO-STAGE HEAT TREATMENT WITH ISOTHERMAL TRANSFORMATION

Journal of Metallic Materials ◽

10.32730/imz.2657-747.21.1.4 ◽

2021 ◽

Vol 73 (1) ◽

pp. 22-31

Author(s):

Bartłomiej WALNIK ◽

Dariusz Woźniak ◽

Aleksandra NIESZPOREK ◽

Mariusz ADAMCZYK

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Hot Rolling ◽

High Strength ◽

Isothermal Transformation ◽

Two Stage ◽

Physical Experiments ◽

Microstructure Examination ◽

Steel Grades ◽

Stage Heat Treatment

The aim of the study was to develop a technology for welding non-weldable 42CrMo4 and NANOS-BA® steel grades in the process of hot rolling and two-stage heat treatment. As a result of physical experiments carried out in a line for semi-industrial simulation of the production of metals and their alloys (LPS) and additional heat treatment, a durable combination of 42CrMo4 and NANOS-BA® steels with high mechanical properties was obtained, including: Rp0.2 = 1036 MPa, Rm = 1504 MPa and A = 10.9%, without microscopically visible cracks and other discontinuities in the joined surface. The quality of the 42CrMo4/NANOS-BA® clad plates produced in this way was assessed on the basis of microstructure examination as well as bending, shear and tensile strength tests.

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Multi-stage heat treatment of aluminum alloy AA7049

Transactions of Nonferrous Metals Society of China ◽

10.1016/s1003-6326(13)62632-1 ◽

2013 ◽

Vol 23 (6) ◽

pp. 1570-1575 ◽

Cited By ~ 26

Author(s):

R. RANGANATHA ◽

V. ANIL KUMAR ◽

VAISHAKI S. NANDI ◽

R.R. BHAT ◽

B.K. MURALIDHARA

Keyword(s):

Heat Treatment ◽

Aluminum Alloy ◽

Multi Stage ◽

Stage Heat Treatment

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Multi-Stage Heat Treatment of Second Generation TiAl Based Alloys

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.211.129 ◽

2013 ◽

Vol 211 ◽

pp. 129-140 ◽

Cited By ~ 1

Author(s):

Agnieszka Szkliniarz ◽

Wojciech Szkliniarz

Keyword(s):

Heat Treatment ◽

Graphite Crucible ◽

Vacuum Induction Furnace ◽

Cyclic Heat Treatment ◽

Two Phase ◽

Soaking Time ◽

Multi Stage ◽

Full Annealing ◽

Cycle Temperature ◽

Stage Heat Treatment

In this work the influence of the particular stages of a multi-stage heat treatment on microstructure and properties of the Ti-47Al-2W-0.5Si alloy was presented. The alloy was melted in a vacuum induction furnace at a special graphite crucible. The received alloy in form of cylindrical ingot with a diameter of 16 mm and a length of 120 mm was homogenized at 1400°C for 1 h with furnace cooling (Stage 1). The proposed further treatment consists of a cyclic heat treatment (Stage 2), under-annealing carried out in a two-phase α+γ area (Stage 3) and a short full annealing conducted in α-phase area (Stage 4). Selection of particular stage parameters including the upper cycle temperature, the soaking time at the upper cycle temperature, the cooling rate from the upper cycle temperature and number of cycles for the second stage and the temperature and time of annealing for the third and forth stage was presented. The purpose of the proposed treatment is microstructure refining. This refinement is associated with the massive transformation that occurs in the alloy after heating to a temperature of 1405°C, short soaking time and cooling in air. The effect of heat treatment parameters on the microstructure and hardness of the investigated alloy was characterized.

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