Effect of Vanadium on Thermal Fatigue Resistance of Cr5 Deposited Metal

2012 ◽  
Vol 512-515 ◽  
pp. 1892-1900
Author(s):  
Qing Bao Wang ◽  
Zhuo Xin Li ◽  
Yao Wu Shi ◽  
Jing Xiao
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
Crack Length ◽  
Fatigue Resistance ◽  
Thermal Fatigue ◽  
Fatigue Cracks ◽  
Vanadium Content ◽  
Thermal Fatigue Resistance ◽  
Deposited Metal ◽  
High Temperature Tensile

In the present work, effect of vanadium on mechanical and thermal fatigue resistance of Cr5 deposited metal is investigated. It is found that hard phases with rich vanadium are mainly distributed at grain boundaries. Vanadium affects the high temperature tensile strength and thermal fatigue cracking obviously. With the increase of vanadium content, high temperature tensile strength of deposited metals shows a initial rise up, then drop for more than 0.54 wt.% V. Toughness and high temperature plasticity are increased up to 0.26 wt.% V, then drop up to 0.89 wt.% V, then toughness and plasticity increase again. Moreover, the thermal fatigue crack length shows a initial decrease up to 0.26 wt. % V, then slightly rise up for 0.89 wt.% V, then crack length shorten again. It is expected that the optimal vanadium content is in a range of 0.18~0.26 wt.% for resisting the thermal crack growth. Fractographic observation shows that the thermal fatigue cracks mainly are transgranular growth. It is felt that the crack length is closely related to microstructure, oxidation resistance, toughness and high temperature plasticity of the deposited alloy

A New Method to Study the Thermal Fatigue Resistance of Molybdenum by High Power Laser Irradiation

2012 ◽  
Vol 184-185 ◽  
pp. 1384-1388 ◽  
Author(s):  
Shuai Lu ◽  
Hong Wei Li ◽  
Dun Bo Yu ◽  
Ming Pang ◽  
Bo Wang
Keyword(s):  
Fatigue Resistance ◽  
Thermal Fatigue ◽  
High Power ◽  
Laser Heating ◽  
Fatigue Cracks ◽  
Crack Density ◽  
Scale Production ◽  
High Power Laser ◽  
Power Laser ◽  
Thermal Fatigue Resistance

In single roll rapid quenching molding, especially for the preparation of amorphous ribbons and rare earth permanent magnetic materials, the chilling roll is an extremely important component of the preparation equipment. However, frequent repair of the roll is not conducive to continuous large-scale production because of its poor thermal fatigue resistance. Molybdenum is gradually being used as chilling roll material in some applications, and in the present paper a new approach to study the thermal fatigue resistance of molybdenum is based on laser pulse irradiation on the molybdenum surface. A new designed device effectively prevents the molybdenum to be oxidized during the laser heating test. The experiments of thermal fatigue damage on molybdenum were conducted by the high power laser. The results shows that the fatigue cracks had been propagated in the irradiated region after the specimen was loaded by 200 times pulsed laser heating. There is a greater crack density in the laser heating brim region than in the center of the irradiated region. According to the transgranular mode of crack propagation in the laser heating brim region and intergranular mode in the center of the irradiated region, the maximum stress took place at the intersection region due to the great temperature gradient in the laser heating brim region. Continued basis-oriented experiments are planned, regarding the mechanism of thermal fatigue crack initiation and propagation for chilling roll materials.

FINKL DCF

Alloy Digest ◽  
2005 ◽  
Vol 54 (11) ◽  
Keyword(s):  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Fatigue Resistance ◽  
Thermal Fatigue ◽  
Heat Treating ◽  
Thermal Fatigue Resistance ◽  
Temperature Performance ◽  
Hardened Condition

Abstract Finkl DCF is a prehardened, single-melt modified H13. The alloy is resulfurized for ease of machining in the hardened condition. This eliminates the necessity of costly and time-consuming vacuum heat treating that normally has to be scheduled after machining. The thermal fatigue resistance is less than that of double-melted DC-Xtra, but DCF is ready for service as machined. It is supplied prehardened at a hardness of approximately 45 HRC. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on high temperature performance as well as forming and heat treating. Filing Code: TS-621. Producer or source: A. Finkl & Sons Company.

Thermal Fatigue of the Selected Tool Steel Applied for Metal Moulds Elements in Die Casting of Metals

2013 ◽  
Vol 58 (3) ◽  
pp. 757-761 ◽  
Author(s):  
J. Zych
Keyword(s):  
Fatigue Resistance ◽  
Tool Steel ◽  
Thermal Fatigue ◽  
Test Bench ◽  
Die Casting ◽  
Fatigue Tests ◽  
Vanadium Content ◽  
Temperature Cycle ◽  
Thermal Fatigue Resistance ◽  
Steel Grades

Abstract The work presents the results of research on thermal fatigue resistance of four steel grades used in the production of metal moulds for pressure diecasting. Thermal fatigue tests were performed on an original test bench using the L.F Coffin method - resistance heated samples. The steels additionally contained alloy additives in the following proportions: Cr = 5.0 ÷5.3%, Mo = 1.30 ÷3.0%, and V = 0.50 ÷1.0%. The thermal fatigue was analyzed using the temperature cycle: Tmin = 200°C; Tmax = 700 ÷750°C. The samples endured between few to few dozens of thousands of temperature cycles in the above temperature range. Steel with maximum vanadium content exhibited the highest level of resistance.

scholarly journals Bionic Repair of Thermal Fatigue Cracks in Ductile Iron by Laser Melting with Different Laser Parameters

Metals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 101 ◽  
Author(s):  
Siyuan Ma ◽  
Ti Zhou ◽  
Hong Zhou ◽  
Geng Chang ◽  
Benfeng Zhi ◽  
...  
Keyword(s):  
Fatigue Resistance ◽  
Thermal Fatigue ◽  
Ductile Iron ◽  
Laser Energy ◽  
Fatigue Cracks ◽  
Fatigue Cracking ◽  
Unit Distance ◽  
Thermal Fatigue Resistance ◽  
Brake Discs ◽  
Thermal Fatigue Cracks

Nodular iron brake discs typically fail due to serious thermal fatigue cracking, and the presence of graphite complicates the repair of crack defects in ductile iron. This study presents a novel method for remanufacturing ductile iron brake discs based on coupled bionics to repair thermal fatigue cracks discontinuously using bio-inspired crack blocking units fabricated by laser remelting at various laser energy inputs. Then, the ultimate tensile force and thermal fatigue crack resistance of the obtained units were tested. The microhardness, microstructure, and phases of the units were characterized using a digital microhardness meter, optical microscopy, scanning electron microscopy, and X-ray diffraction. It was found that the units without defects positively impacted both the thermal fatigue resistance and tensile strength. The unit fabricated at a laser energy of 165.6 − 15 + 19 J/ mm 2 had sufficient depth to fully close the crack, and exhibited superior anti-cracking and tensile properties. When the unit distance is 3 mm, the sample has excellent thermal fatigue resistance. In addition, the anti-crack mechanism of the units was analysed.

Improvement of Thermal Fatigue Resistance of A Wrought Nickel-Base Superalloy by Laserglaze

1985 ◽  
Vol 58 ◽  
Author(s):  
Zhao Qi ◽  
Ge Yunlong ◽  
Hu Zhuangqi ◽  
Jiang Ming ◽  
Shih Changshu
Keyword(s):  
Heat Treatment ◽  
Fatigue Resistance ◽  
Thermal Fatigue ◽  
Fatigue Cracks ◽  
Nickel Base Superalloy ◽  
Post Heat Treatment ◽  
Thermal Fatigue Resistance ◽  
Nickel Base ◽  
Thermal Fatigue Cracks ◽  
Base Superalloy

ABSTRACTLaserglaze with appropriate post heat treatment has improved the thermal fatigue resistance of a wrought nickel-base superalloy. It was found that laserglaze was able to eliminate the blocky MC phase, refine grains and form a very interesting microstructure of serrated grain boundaries. Careful selection of post heat treatment markedly increased the strength in the laser irradiated region. The initiation and propagation of thermal fatigue cracks were suppressed by this novel microstructure.

THERMO-SPAN ALLOY

Alloy Digest ◽  
1994 ◽  
Vol 43 (2) ◽  
Keyword(s):  
Physical Properties ◽  
Tensile Properties ◽  
Fatigue Resistance ◽  
Thermal Fatigue ◽  
Rupture Strength ◽  
Stress Rupture ◽  
Heat Treating ◽  
Thermal Fatigue Resistance ◽  
Stress Rupture Strength

Abstract THERMO-SPAN ALLOY is a precipitation-hardenable superalloy with a low coefficient of expansion combined with tensile and stress-rupture strength. Thermal fatigue resistance is inherent. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on forming and heat treating. Filing Code: FE-105. Producer or source: Carpenter.

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