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GB/T 23605-2020: Determination of β transus temperature of titanium alloys
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 23605-2020	English	339	Add to Cart	4 days [Need to translate]	Determination of β transus temperature of titanium alloys
GB/T 23605-2009	English	479	Add to Cart	3 days [Need to translate]	Method for β transus temperature determination of titanium alloys

GB/T 23605-2020: Determination of β transus temperature of titanium alloys

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Determination of β transus temperature of titanium alloys ICS 77.120.50 H21 National Standards of People's Republic of China Replaces GB/T 23605-2009 Method for measuring β-transition temperature of titanium alloy 2020-03-06 release 2021-02-01 implementation State Administration of Market Supervision Published by the National Standardization Administration

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 23605-2009 "Method for determination of β-transition temperature of titanium alloys". Compared with GB/T 23605-2009, except for editorial changes, the main technical changes of this standard are as follows. --- Removed the normative reference file GB/T 13298 (see Chapter 2, Chapter 2 of the.2009 edition); --- Modify the element "Method Principle" to "Principle" and change "Primary Alpha" to "Primary Alpha Phase or Precipitated Alpha Phase" (see Chapter 4,.2009 Chapter 4 of the edition); --- Modify the element "sampling requirements" to "samples" and modify the corresponding sample requirements (see Chapter 5, Chapter 5 of the.2009 edition); --- Modified the element "test equipment requirements" to "instrument equipment" and modified the corresponding requirements (see Chapter 6,.2009 edition Chapter 6); --- Modified the element "test conditions and requirements" to "test steps", and modified the interval between the heat treatment temperature of the sample and the holding time of the sample And quenching delay time requirements (see 7.1, Chapter 7 of the.2009 edition); --- Removed the "recommended ordinary annealing after quenching" provisions (see 7.1.3 of the.2009 edition); --- Modified the element "metallographic sample preparation and inspection requirements" to "test steps" and revised the corresponding requirements (see Chapter 7,.2009 Chapter 8 of the edition); --- Increased the provisions for corrosion and inspection magnification of samples (see 7.2.2 and 7.2.3); --- Modified the judgment method of β-transition temperature and the expression of results (see Chapter 8, 9.1 of the.2009 edition); --- Modify the element "inspection report" to "test report" and modify the corresponding content (see Chapter 9, Chapter 10 of the.2009 edition); --- Amended Appendix B, and listed the typical quenching micrograph of β-transition temperature judgment of α-type, α-β-type and metastable β-type titanium alloys (See Appendix B, Appendix B of the.2009 edition). This standard is proposed by China Nonferrous Metals Industry Association. This standard is under the jurisdiction of the National Nonferrous Metals Standardization Technical Committee (SAC/TC243). This standard was drafted. Baotai Group Co., Ltd., Baoji Titanium Industry Co., Ltd., Nonferrous Metals Technology and Economic Research Institute, Baosteel Special Steel Co., Ltd., Northwest Nonferrous Metal Research Institute, Western Metal Materials Co., Ltd., Western Superconducting Material Technology Co., Ltd. The main drafters of this standard. Mu Danning, Shi Wen, Li Jian, Li Xiao, Zhang Lei, Xie Chen, Feng Junning, Bai Zhihui, Feng Yongqi, Gu Yan, Wang Songmao, Ma Hongzheng, Zhu Jing, Gao Yan, Jia Shuanxiao. The previous versions of the standards replaced by this standard are. --- GB/T 23605-2009. Method for measuring β-transition temperature of titanium alloy

1 Scope

This standard specifies the principle of metallurgical method for the determination of β-transition temperature of titanium alloys, samples, equipment, test procedures, determination of test results, And test report. This standard applies to the use of metallographic methods to determine the β-type, α-β-type and metastable β-type titanium alloys β transition temperature.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 5168 Titanium and titanium alloy high and low magnification microstructure inspection method GB/T 9452 Determination method of effective heating zone of heat treatment furnace

3 terms and definitions

The following terms and definitions apply to this document. 3.1 βtransustemperature The lowest temperature at which all titanium alloys transform to β-phase structure during heating is represented by Tβ.

4 Principle

α-type, α-β-type and metastable β-type titanium alloys all contain a certain number of primary α-phases after smelting, hot deformation, annealing and solution aging. The aging phase precipitates an alpha phase. As the temperature increases, the α phase in the titanium alloy gradually decreases, and when it reaches a certain critical temperature, it will all transform into β phase structure. After the critical temperature is maintained for a certain period of time, rapid quenching can obtain acicular martensite or metastable β-phase structure without α phase. Through view Check the metallographic structure of the sample after quenching at different temperatures according to the preset temperature interval to determine the β-transition temperature of the titanium alloy.

5 sample

5.1 Samples can be taken from any part of the product processing process, such as intermediate ingots such as ingots, rod billets, forging billets and slabs, or bars, plates For processed products such as wood, the same group of sample blanks should be taken from the same processing link of the product. If the product standard has requirements for sampling, Quasi-execution. 5.2 When cutting the sample, deformation and overheating should be avoided, and the surface to be tested of the sample should be able to better represent the entire cross-section structure of the material. 5.3 The sample should be a cylinder with a diameter of 10mm ~ 12mm and a height of 15mm, or a rectangular parallelepiped with a side length of 10mm ~ 12mm and a height of 15mm. 5.4 The number of samples in each group is usually five, which can also be appropriately increased or decreased. 5.5 Phase transition test of metastable β-type titanium alloys in hot and solid solution state. If necessary, the sample blank should be heat treated first. TB2, TB3 are recommended The heat treatment system with TB5 is. After holding at 650 ℃ ± 10 ℃ for 1 hour, it is cooled to 550 ℃ ± 10 ℃ with the furnace and air-cooled. ...