5130 (SAE, 30Cr) metallographic diagram

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Quantitative Metallography on AISI 5130 Steel

Metallography is a microscopy technique used to observe and analyze the structure of metals and alloys. Since metallography can provide an effective means for evaluating the structure of metals and alloys, it is often employed as part of quality control. This paper examines the metallography of AISI 5130 steel, which is an alloy containing 0.30-0.35% carbon and 0.4-1.0% chromium, with other elements including manganese and silicon.

The metallographic analysis of AISI 5130 steel was performed using a standard procedure. First, a sample of the steel (approximately 5-7mm in size) was mounted in a copper ring and embedded in an epoxy resin. The resin and sample were then processed and examined with an optical microscope. Visual observations revealed the presence of a coarse grain structure with small amounts of ferrite and pearlite. Grain size was determined using an AccuPhase AFM (Atomic Force Microscope) and was found to be between 23 μm and 30 μm.

A further investigation of the microstructure was conducted through quantitative analysis. This included measuring the grain size, determining the percentage of ferrite and pearlite, and evaluating the grain structure. The results showed that the grain size was in the range of 23 μm to 30 μm, with an average of 27 μm. The percentage of ferrite and pearlite was 17% ferrite and 83% pearlite. The grain structure was described as fairly coarse, with some mixture of equiaxed and dendritic morphology.

The study demonstrates that AISI 5130 steel has a relatively coarse grain size, with a majority of pearlite present in the microstructure. Quantitative metallography can be used to monitor and validate the quality of the steel and ensure that it meets the manufacturer’s specifications. The results are also valuable for analyzing how changes in production parameters will affect the microstructure of the final material.

SAE 30Cr Alloy is a martensitic, low-alloy steel primarily utilized in automotive and industrial applications. This steel is composed of Chromium, 0.30% maximum Carbon, and Lead.

SAE 30Cr Alloy combines excellent strength and toughness. At elevated temperatures it maintains its higher strengths while still maintaining reasonable ductility. This alloy’s toughness makes it suitable for applications such as shafts and gears.

The microstructure of SAE 30Cr Alloy consists of martensite and as such, possesses good wear resistance as well as fatigue resistance. In addition, it has excellent corrosion resistance, due to its high chromium content.

The metallurgical microstructure of SAE 30Cr Alloy is classified as an “intermediate” matrix because it has been tempered, or “softened” from its original condition, after being quenched or “hardened”. SAE 30Cr Alloy’s metallurgical microstructure is also quite delicate and must be carefully managed.

The high chromium content in SAE 30Cr Alloy also contributes greatly to its high temperature strength and fatigue resistance. The higher level of chromium in this alloy increases its strength at increased temperatures. It also has good impact resistance, making it an appropriate choice for applications subject to extreme temperatures.

The use of SAE 30Cr Alloy should be limited to applications that require toughness, wear, and fatigue resistance. It should be avoided in applications where strength and high temperature strength are the primary requirements.