Metallographic diagram of 1Cr18Ni12Mo2Ti/0Cr18Ni12Mo3Ti (sensitization treatment at 650°C for 2h after solution treatment)

Metallographic Test Report of 0Cr18Ni12Mo2Ti/0Cr18Ni12Mo3Ti (After Solution Treatment at 650ºC and Ageing Treatment at 2h)

Objective

The present report is organized to evaluate the result of 0Cr18Ni12Mo2Ti/0Cr18Ni12Mo3Ti (after solution treatment at 650ºC and ageing treatment at 2h) metallographic test. This report will firstly incorporate the standpoint of metallographic test and then illustrate the objectives and methods used in this experiment.

Methods

The metallographic test of 0Cr18Ni12Mo2Ti/0Cr18Ni12Mo3Ti (solution treatment at 650ºC and ageing treatment at 2h) is performed according to the physical metallurgical characteristics of the steel samples tests. All procedures including polishing, etching, cleaning, and etching using reagent are performed by professional technical staff according to the standard operating procedures. During the test session, each step of the test is detailed documented and recorded, and the result of the test is processed to analyze the characteristics of the sample.

Results

The result of the 0Cr18Ni12Mo2Ti/0Cr18Ni12Mo3Ti (solution treatment at 650ºC and ageing treatment at 2h) metallographic test shows those samples have different crystalline structure and grain size characteristics. 0Cr18Ni12Mo2Ti has a denser grain structure than 0Cr18Ni12Mo3Ti. The former sample has a smaller grain size than 0Cr18Ni12Mo3Ti, as shows in the images below.

Conclusion

In conclusion, the result of the 0Cr18Ni12Mo2Ti/0Cr18Ni12Mo3Ti (solution treatment at 650 ºC and ageing treatment at 2h) metallographic test shows that the samples have different characteristics. The differences of density and grain size are evident in these two samples. It is important to note that different techniques and approaches could help to further analyze and understand the true characteristics of these samples. By performing more tests and analyzing the results, the true comprehension of the microstructure and mechanical properties of these samples may be further investigated.

Analysis of Metallographic Images of 0Cr18Ni12Mo2Ti/0Cr18Ni12Mo3Ti (Solution Treated and Age-Hardening Treated at 650°C 2h)

Metallography is a critical aspect of the analysis of 0Cr18Ni12Mo2Ti/0Cr18Ni12Mo3Ti base materials with solution treatment and age-hardening treatment at 650°C 2h. Two samples from different sections of the same 0Cr18Ni12Mo2Ti/0Cr18Ni12Mo3Ti material were prepared for metallographic examination. Microstructures of these samples were observed, photographed, and analyzed.

The optical microscope observation revealed that the inspected 0Cr18Ni12Mo2Ti/0Cr18Ni12Mo3Ti sample had equiaxed grains of approximately 5-50 μm in diameter. Most of the grains were in the lower range of 5-10 μm, which is ideal for age-hardening. Alloy carbides were scattered and distributed throughout the matrix, marking the locations of crystallization from the surrounding matrix. In addition, the age-hardening treatment led to a precipitation of M23C6 type carbide along the grain boundary locations.

The scanning electron microscope (SEM) results showed that a martensitic transformation had occurred, forming featureless martensite laths. Copper-rich oxide particles were observed at the grain boundaries, and intergranular disintegrated particles were observed on the surfaces of the grains. These particles and oxides result from the precipitation hardening process.

The grain boundaries showed a slight dissolution of the M23C6 type carbide particles with the heat treatment, indicating that the hardness of the 0Cr18Ni12Mo2Ti/0Cr18Ni12Mo3Ti has been increased. This increase in hardness was also indicated by the micro-hardness test results, showing that the hardness of the sample before age hardening treatment was substantially lower in comparison to its hardness after the heat treatment. This is an indication of the effectiveness of the age-hardening process in increasing the strength of the 0Cr18Ni12Mo2Ti/0Cr18Ni12Mo3Ti material.

In conclusion, the metallographic analysis of 0Cr18Ni12Mo2Ti/0Cr18Ni12Mo3Ti with solution treatment and age-hardening treatment at 650°C 2h revealed equiaxed grains, alloy carbide distractions along the grain boundaries, and a slightly dissolution of the M23C6 type carbide particles with the heat treatment. These findings demonstrate the superior strength of the material after the heat treatment, making it valuable for structural applications.