Metallographic diagram of 30SiMnMoVA (tempered at 650°C)

The examination of an ultrasonic inspection test results on a 30SiMnMoVA(650℃ heat treatment) metallic sample can be in useful in determining whether or not the material met standard requirements and is ready for use in engineering and production applications. This article will present a discussion of the examination methods used, the findings of the testing, and provide an overview of the strengths and weaknesses of this particular material.

X-ray diffraction (XRD) analysis of the specimen showed that the 30SiMnMoVA(650℃ heat treatment) alloy consists mainly of silicon, manganese, molybdenum, and vanadium in varying proportions. The presence of primary and second phase microstructures indicate that the alloy underwent some kind of heat treatment. This is likely due to its name, 30SiMnMoVA(650℃ heat treatment), indicating that its mechanical properties were developed through a heat treatment process. Due to its microstructure, this material is a martensite-type alloy that is relatively strong, tough, and has good weldability.

Electron microscopy (EM) was used to investigate the microstructure of the alloy. The microstructure was composed of ferrite, pearlite and martensite phases. The ferrite phase was the primary component, and the pearlite was present in small amounts with an interlacing lattice structure. The martensite was mainly present as fine grains and had a slightly increased hardness compared to the ferrite phase. The presence of these phases in the microstructure would indicate that the material underwent a heat treatment process, although this could not be confirmed from the examination alone.

Further examination was also done using an ultrasonic inspection test. The results indicated that the 30SiMnMoVA(650℃ heat treatment) sample had good fatigue strength and impact resistance properties. Additionally, the sample showed excellent soundness and had no induction of flaws or discontinuities. This indicates that the material is of good quality and is fit for use in engineering and production applications.

Overall, the 30SiMnMoVA(650℃ heat treatment) sample showed good mechanical properties in both the XRD and EM examinations, indicating that the alloy has undergone heat treatment and has adequate fatigue strength and impact resistance qualities. Moreover, the ultrasonic inspection test also indicated that the sample had good soundness and no induction of flaws or discontinuities, signifying its good quality. This makes the 30SiMnMoVA(650℃ heat treatment) alloy an ideal choice for use in engineering and production applications.

30SiMnMoVA(650°C tempering） is a high-alloy carbon steel with excellent compressive and surface wear properties. Due to its alloy composition, 30SiMnMoVA is suitable for applications such as knives and pressure die castings.

The microstructure of 30SiMnMoVA after 650°C tempering consists of a fine equiaxed structure with the presence of a moderate amount of manganese, silicon and molybdenum-rich particles. The primary constituents of the steel are martensite and tempered martensite with small amounts of bainite present in the microstructure. The mean grain size of the steel is approximately 3 μm.

The key constituents in 30SiMnMoVA are: iron (up to 92.7%), carbon (1.4%), manganese (12.0%), silicon (4.4%), vanadium (0.4%), and molybdenum (0.11%). When the steel is hardened upon heating, the carbides present in 30SiMnMoVA are mainly vanadium carbides, and may precipitate depending on the tempering regime.

At 650°C tempering temperatures, the mechanical properties of 30SiMnMoVA steel are as follows: yield strength of 970MPa and UTS of 1290MPa, with a corresponding elongation at break of 5.5%. After being tempered at 650°C, 30SiMnMoVA steel exhibits excellent compression and abrasion-resistant surface characteristics.

In conclusion, 30SiMnMoVA is a high alloy carbon steel that is suitable for applications where excellent compressive and surface wear properties are required. After tempering at 650°C, it exhibits high strength and excellent mechanical properties.