GB/T 39520-2020 in English

VALID

Test method for determination the residual stress of spring by X-ray diffraction

Issued on:2020-11-19
Implemented on:2021-06-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $250.00
$243.00

Standard No:	GB/T 39520-2020
Document status:	VALID
Title in English:	Test method for determination the residual stress of spring by X-ray diffraction
Title in Chinese:	弹簧残余应力的X射线衍射测试方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2020-11-19
Implemented on:	2021-06-01
ICS Classification:	21.160-Springs
Chinese Classification:	J26-Spring
Professional Classification:	GB-National Standard
Related Topics:	x-ray diffraction x-ray diffraction group X-ray Diffraction Standards x-diffraction x-ray remnant Residual Stress Stress testing methods and Ray standard Electron Diffraction Secondary Diffraction Residual stress gauge x-ray diffraction Ray Diffraction diffraction Diffraction method X-ray Diffraction+ Standard Stress test methods and standards Diffraction peaks x-diffraction Is X-ray Diffraction Safe? 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Diffraction plate Diffraction peaks of cobalt cobalt diffraction peak from ray app Diffraction concept X-ray Diffraction Microscopic What are the methods of diffraction? wood residual stress X-ray stress test method. X-ray principle? X-ray diffraction equipment X-ray diffractometer residual stress X-ray diffraction sample preparation volume x-ray stress measurement X-ray diffraction peak position X-ray diffraction equipment residual standard Diffraction point Intensity of x-ray diffraction peaks Test center x-ray stress Diffraction of waves Detection of Diffraction Peaks X-ray diffraction peak broadening x-ray principle Measurement of Residual Stress by Neutron Diffraction Test method for rotational orientation of crystal materials by x-ray diffractometer Diffraction efficiency measurement X-ray diffraction lines x-ray sample preparation method x-ray diffraction method x-ray diffraction and Diffraction peak half width Diffraction peak position Diffraction line ray effect double diffraction method residual austenite residual stress Principles of X-ray Diffraction X-ray spectroscopy applications hand-held x-diffraction X-ray diffraction peak broadening X-ray diffraction crystal form x-ray stress test method x test principle What does x-ray diffraction measure? Pigment X-ray Diffraction x-ray stress analysis main applications of x-rays main applications of x-rays x-ray test stress GBT39520 GB/T 39520-2020 The nature of diffraction residual stress solvent Whole Rock X-ray Diffraction Whole-rock X-ray diffraction Rays Residual Stress Test Radiation Laue method x-ray diffraction Factors affecting x-ray diffraction peaks Basic principles of measuring surface residual stress by x-ray diffraction Can x-ray diffraction measure functional groups? cast iron ray residual stress Spring pressure test method stress Corrosion method to test residual stress Residual stress in steel Standard diffractogram method diffraction method Residual voltage test official Compression spring test force Method for determination of residual ethylenediamine How to make your own spring dynamometer Test method for residual adhesion rate of release paper Push spring force method Spring dynamometer reading method Residual rate test Zero adjustment method of spring dynamometer Measurement method of elasticity testing machine Residual adhesion test method How to eliminate residual stress Copper wire stress test Lens diffraction angle test method Methods to reduce residual stress Main methods of residual stress testing gb/t 39520-2020

《GB/T 39520-2020弹簧残余应力的X射线衍射测试方法》由TC235（全国弹簧标准化技术委员会）归口，主管部门为国家标准化管理委员会。

Introduction

Analysis of the core content of the standard

The GB/T39520-2020 standard system specifies a method system for detecting spring residual stress using X-ray diffraction technology, which is applicable to stress analysis of iron-based alloy spring products such as coil springs, leaf springs and stabilizer bars.

Technical Principles and Test Methods

Test Methods	Geometric Layout	Applicable Scenarios	Accuracy Requirements
Co-inclination Method	Stress Direction Plane Coincides with 20° Plane	Conventional Stress Test	±14MPa
Tilt Method (Ω Method)	Stress Direction Plane is Perpendicular to 20° Plane	Complex Geometric Components	±10MPa

Note: The test principle is based on Bragg's law. Macroscopic stress is deduced by measuring lattice strain. The diffraction peak displacement reflects the stress magnitude, and the half-width is related to microscopic stress.

Key instrument requirements

Goniometer: It is necessary to ensure the quadruple alignment of the X-ray tube, detector, spot center and test point.
X-ray tube: Cr target (ferritic steel) or Mn target (austenitic steel) is preferred.
Detector: Single point/linear array/area array, resolution ≤0.1°

Key points of operating specifications

Sample preparation

Surface roughness requirements: helical spring Ra≤10μm, leaf spring Ra≤20μm. The electropolishing peeling depth deviation must meet the following requirements:

Peeling depth (μm)	Allowable deviation (μm)
0-50	±5
50-150	±10

Test parameters

It is recommended to set the Ψ angle to more than 4, ranging from 0-45°; the 20 scanning range must include the complete diffraction peak (≥4 times the half-height width)

Standard application case

The test of a SAE9254 material helical spring shows: surface residual stress -771MPa, maximum stress -946MPa (depth 0.112mm), and stress influence depth of 0.3mm. The data meets the standard's ±10MPa error requirement when the confidence probability is 0.75.

Implementation recommendations

Regularly use stress-free iron powder to calibrate the equipment (deviation > 14MPa requires readjustment)
For complex geometric parts, the tilt method is preferred to reduce projection errors
When testing austenitic steel, attention should be paid to the problem of overlapping interference of diffraction peaks

More samples: DL/T 5154-2012 JC/T 2453-2018 JJG 21-2008

Sample only — not a preview of GB/T 39520-2020

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