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Prediction method for severe wear transition of heat-resistant magnesium alloy at 50-200℃

A magnesium alloy, heat-resistant technology, applied in the metal field, to achieve the effect of less test volume, low cost and high efficiency

Active Publication Date: 2021-03-02
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there is no prediction method for light-severe wear transition load of heat-resistant magnesium alloy under high-temperature dry friction conditions in China. Only a large number of wear tests can be carried out in the temperature range of 50-200 ° C, and the transition load can be obtained from the turning point of the wear rate curve. , to provide a basis for the design and application of heat-resistant magnesium alloy wear parts

Method used

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  • Prediction method for severe wear transition of heat-resistant magnesium alloy at 50-200℃
  • Prediction method for severe wear transition of heat-resistant magnesium alloy at 50-200℃
  • Prediction method for severe wear transition of heat-resistant magnesium alloy at 50-200℃

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Effect test

Embodiment 1

[0035] Cast Mg-Y-Zn alloy, the chemical composition is Mg-6.8Y-2.5Zn. Use a sample with a diameter of 8mm and a height of 12mm at 250-360°C and 1×10 -4 -1×10 -1 the s -1 The thermal compression test is carried out within the range, and the dynamic recrystallization activation energy can be calculated by using the true stress-strain curve to be 238kJmol -1 , from 1×10 -2 -1×10 -1 the s -1 The structure observation of the compressed sample under the condition can confirm that the dynamic recrystallization start temperature is 320℃. The dynamic recrystallization temperature corresponds to a sliding speed of 1.0ms -1 Under the condition of critical recrystallization temperature, the B value can be obtained as 5.9852×10 -19 , and can find 0.8, 3.0 and 4.0m s-1 The dynamic recrystallization temperature at which slight-severe wear transition occurs at sliding speed is shown in Table 1.

[0036] Table 1 shows the dynamic recrystallization temperature of mild-severe wear transi...

Embodiment 2

[0051] Cast Mg-Gd-Y-Zr alloy, the chemical composition is Mg-10.1%Gd-1.4%Y-0.4%Zr. Use a sample with a diameter of 8mm and a height of 12mm at 250-360°C and 1×10 -4 -1×10 -1 the s -1 The thermal compression test is carried out within the range, and the dynamic recrystallization activation energy can be calculated as 176kJmol by using the true stress-strain curve -1 , from 1×10 -2 -1×10 -1 the s -1 The observation of the structure of the compressed sample under the condition can confirm that the dynamic recrystallization start temperature is 300 ℃. Under the test condition of 50°C, a pin sample with a diameter of 6mm and a height of 12mm is used to rub against a steel grinding disc with a hardness of 56HRC, and the wear rate is 0.8ms -1 .

[0052] Test example 1

[0053] see Figure 4 Shown is the wear rate-load relationship measured at 50°C, the transition load determined from the wear curve is 120N, and the friction coefficient at this time is 0.32, and K can be obta...

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Abstract

The invention relates to a prediction method for severe wear transition of heat resisting magnesium alloy under temperature of 50-200 DEG C, and belongs to the field of metal material tribology. On the basis of wear surface dynamic recrystallization temperature criteria, when the wear surface temperature Ts induced by friction heat reaches the critical dynamic recrystallization temperature TDRX, namely Ts is larger than or equal to TDRX, slight-severe wear transition happens; according to a friction wear test result under a certain medium speed and the temperature of 50 DEG C, slight-severe wear transition loads and friction coefficients are obtained, on the basis of thermal activation energy obtained in a thermo-compressive deformation test withint he strain rate range from 1*10<-4> to 1*10<-1> s<-1> and the dynamic recrystallization temperature under the certain strain speed, a sliding speed and wear surface dynamic recrystallization temperature relational expression is built, and the critical dynamic recrystallization temperatures under different sliding speeds are worked out. Different sliding speeds and slight-severe wear transition loads under the temperature of 50-200 DEG Ccan be predicted only through a small quantity of high-temperature friction-wear tests under the condition of 50 DEG C, the testing efficiency is high, the cost is low, and the effect is good.

Description

technical field [0001] The invention relates to the field of metals, in particular to a prediction method for severe wear transition of a heat-resistant magnesium alloy at 50-200°C. It is used to determine the working safety zone under the condition of high temperature dry friction of heat-resistant magnesium alloy. Background technique [0002] Conventional commercial magnesium alloys such as AZ and AM series alloys have low density, high specific strength, good casting and processing deformation properties, and are widely used in aerospace and automotive industries. However, low high temperature strength and poor wear performance have become two obstacles restricting the manufacture of high temperature wear parts of magnesium alloys. The thermal stability of magnesium alloys depends on the type of alloying elements and the characteristics of intermetallic compounds. By optimizing the combination of alloying elements, magnesium alloy matrix and intermetallic compound phase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F119/08
CPCG06F30/20G06F2119/08
Inventor 闫晓晗安健吕晓霞王渊博张翼祥冯吉贺
Owner JILIN UNIV