Analyses of Strength, Heat Treatment,
and Processing and Welding of Metallic Materials and Steel Materials

Factors that affect the strength (fatigue, creep, toughness) of metallic materials and steel materials include the following:

To enhance strength, optimize heat treatment conditions, and improve workability, weldability and slidability, as well as analyze problems, we provide appropriate analysis and results.

JFE-TEC's micro- to macro-scale observations of the metal structure reflect the strength of the metal and the fracture surface of broken metal (fractography), observation of crystalline particles, intercrystalline interface, alloy phases, dislocations, and microstructures inside crystalline particles using electron microscopy (EM), energy dispersion-type X-ray analysis (SEM-EDX, EPMA) using scanning electron microscopy, energy dispersion-type X-ray analysis/electron energy loss spectroscopy (TEM-EDX/EELS) using transmission electron microscopy, and element analysis using surface analysis method.

We also evaluate the texture and orientation using the X-ray diffraction method (XRD) and electron backscatter diffraction method (EBSD) and conduct quantitative evaluation of the residual austenite phase.

Morphological observation

Elementary analysis

  • Concentration distribution of chrome (Cr)-depleted layer in sensitized stainless steel
  • Analysis of stainless steel passive film using Cs corrector STEM-EDX/EELS * Cs corrector STEM: transmission electron microscopy with Cs corrector

Crystalline structure analysis

JFE-TEC conducts macro- to nano-scale observations and analyses of precipitates and inclusions that may cause strength increases or strength decreases.

Morphological observation

Element analysis

Crystalline structure analysis

  • Crystalline orientation observation and analysis of boron nitride crystalline particle
  • Phase-based quantitative observation of precipitate in heat-resistant steel
  • Phase-based quantitative observation of precipitate

We conduct macro- to nano-scale observations and analyses of the intercrystalline interface that may cause strength increases or strength decreases.

Morphological observation

  • Metal structure observation (micro/macro observation)
  • Intercrystalline interface observation using Cs corrector STEM, TEM and SEM
  • Analysis of intercrystalline interface precipitate using SEM and TEM

Element analysis

  • Concentration distribution of chrome (Cr)-depleted layer in sensitized stainless steel
  • Mapping analysis of boron intercrystalline segregation in steel material
  • Analysis of phosphorus intercrystalline segregation in steel material
  • Analysis of intercrystalline segregation/concentration element using Cs corrector STEM-EDX/EELS
  • Analysis of stainless steel passive film using Cs corrector STEM-EDX/EELS

Crystalline structure analysis

  • Crystalline orientation analysis using EBSD

We analyze the main components and minor components of high strength parts.

Chemical analysis

  • Main component analysis
  • Minor element analysis, gas component analysis
  • Phase-based precipitate analysis

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