Fracture Detection

Detection range

Black metals: carbon steel, alloy structural steel, stainless steel, tool steel, bearing steel, cast iron (gray iron/ductile iron/creep iron), high manganese steel, etc

Nonferrous metals: aluminum and aluminum alloys, copper and copper alloys, magnesium alloys, titanium and titanium alloys, zinc alloys, nickel based high-temperature alloys, etc

Special materials: hard alloys, powder metallurgy materials, precision alloys, welding alloys, metal composite materials, etc

General components: fasteners, shafts, gears, molds, springs, plates/pipes/profiles, etc

Engineering components: welded joints, heat-treated parts, pressure vessels, chemical pipelines, wind turbine spindles, ship accessories, aerospace components, etc

Test items

 

Macroscopic observation of fracture surface: Record the color, gloss, texture, and geometric shape of the fracture surface
Fault source localization and feature analysis: Determine the location of fault initiation and identify the macroscopic features of the source area (such as small planes, pits, and exposed inclusions)
Crack propagation path analysis: tracking the propagation direction and branching characteristics of cracks from the source area to the instantaneous fracture area
Fracture zone division: distinguish the range and proportion of source zone, extension zone (fatigue zone/creep zone), and transient fracture zone
Preliminary determination of failure modes: Qualitative differentiation of plastic fracture, brittle fracture, fatigue fracture, creep fracture, corrosion fracture, etc
Measurement of macroscopic characteristic parameters: measuring the size of the source area, the spacing between stripes in the expansion area, and the area of the instantaneous break zone, etc
Microscopic morphology feature recognition: determining typical microscopic morphologies such as cleavage, quasi cleavage, transgranular fracture, ductile dimples (micro pore aggregation), fatigue bands, creep voids/grain boundary slip, stress corrosion cracking, etc

Correlation analysis between fracture and inclusions/second phases: Identify non-metallic inclusions and precipitates at the fracture surface to determine whether they are the core of crack initiation
Microcrack initiation and propagation characteristics: observation of the initiation location and propagation mode (transgranular/transgranular) of microcracks
Quantitative/semi quantitative analysis of failure mechanism: statistical parameters such as fatigue band spacing, creep pore density, and intergranular fracture ratio
Verification of environmental failure characteristics: identification of micro features related to the environment, such as corrosion products and hydrogen embrittlement induced transgranular fracture
The correlation between material organization and fracture: analyzing the influence of matrix microstructure (such as martensite, pearlite) on fracture behavior

GB/T 30558-2024 General Guide for Fracture Analysis of Metallic Materials

GB/T 18144-2019 Test Method for Fracture Surface of Metallic Materials

GB/T 13298-2015 Method for examination of microstructure of metals

GB/T 228.1-2021 Tensile Testing of Metallic Materials Part 1: Room Temperature Test Method

GB/T 229-2022 Metallic Materials - Charpy Pendulum Impact Test Method

GB/T 3075-2024 Fatigue Testing of Metallic Materials - Axial Force Control Method

GB/T 16545-2024 Corrosion of metals and alloys - Removal of corrosion products on corrosion specimens

GB/T 2039-2012 Metallic Materials - Uniaxial Tensile Creep Test Method

Zhejiang Gangxin Testing Technology Co., Ltd.

was established in 2011. As a national high-tech enterprise recognized by the Zhejiang Provincial Higher People's Court as a judicial authentication institution for construction engineering quality, we specialize in structural performance testing and safety assessment of construction projects, special equipment, communication towers, electromagnetic environments, large bridges, and building safety appraisal.

The company has more than 100 professional and technical personnel, over 90% of whom hold various medium and senior technical certificates. Equipped with complete testing equipment worth over RMB 10 million, our business scope covers the whole country.