Short answer

When designing steel forged components, carefully control the soak temperature to manage surface hardness and roughness. Select lubricants that are proven to withstand high forging temperatures to ensure consistent performance and desired surface finish.

Field: Final Production
Source: The International Journal of Advanced Manufacturing Technology (2020)
Method: Experimental investigation
Evidence: Strong effect

Elevating the soak temperature during steel forging to 1300°C, compared to 1030°C, results in a rougher surface finish and reduced surface hardness of the final product. This final production research insight is drawn from a 2020 study published in The International Journal of Advanced Manufacturing Technology. Using Experimental investigation, researchers explored how this design variable affects real-world outcomes. The key design takeaway: When designing steel forged components, carefully control the soak temperature to manage surface hardness and roughness. Select lubricants that are proven to withstand high forging temperatures to ensure consistent performance and desired surface finish.

Study

Final ProductionHigh ImpactStrong effect

Higher forge soak temperatures increase surface roughness and decrease hardness in steel

Elevating the soak temperature during steel forging to 1300°C, compared to 1030°C, results in a rougher surface finish and reduced surface hardness of the final product.

The International Journal of Advanced Manufacturing Technology · 2020

Key Findings

01Higher soak temperature (1300°C) resulted in lower surface hardness and higher surface roughness compared to the lower soak temperature (1030°C).
02Water-based lubricants showed negligible difference from unlubricated samples, suggesting evaporation before forging.
03Graphite-molybdenum disulphide grease led to higher surface roughness and non-symmetric distortion patterns.

Application

Design takeaway

How to apply

When specifying forging processes for steel components, consider the trade-offs between achieving desired internal material properties at higher temperatures and the potential for increased surface defects. Conduct pilot tests with chosen lubricants to validate their performance under actual forging conditions.

Project actions

01When investigating material processing, ensure precise control over all variables, especially temperature.
02Document the exact type and application method of any lubricants used.

Method & Evidence

AimTo investigate the influence of soak temperature and different forging lubricants on the surface hardness and roughness of BS970:708M40 alloy steel forgings.

MethodExperimental investigation

ProcedureRing compression tests were conducted on BS970:708M40 alloy steel samples. Samples were subjected to two different soak temperatures (1030°C and 1300°C) and four lubrication conditions (synthetic water-based, graphite water-based, graphite-molybdenum disulphide grease, and unlubricated). Surface hardness and roughness were measured before and after forging.

ContextMetal forging, materials processing, manufacturing

Variables

IV["Soak temperature","Lubricant type"]

DV["Surface hardness","Surface roughness"]

CV["Steel alloy (BS970:708M40)","Forging equipment (drop forging hammer)","Heating method (induction heating)","Ring compression test geometry"]

Strengths & Limitations

Strengths

+Controlled experimental setup using a drop forging hammer and induction heating.
+Quantitative measurement of surface properties (hardness and roughness).

Limitations

The number of lubricants and temperature points tested was limited. The study did not explore the long-term durability implications of the surface changes.

Reliability & validity

The use of calibrated equipment for measuring hardness and roughness contributes to the validity of the findings. The controlled experimental setup enhances reliability. However, the sample size and the specific range of parameters tested might limit generalizability.

Think critically

How might the observed effects of soak temperature on surface properties influence the choice of secondary finishing processes for forged components?

Design Principles

"Material surface properties are a direct function of processing parameters and material interactions."

Understanding the impact of process parameters like soak temperature is crucial for controlling the surface integrity of forged components. This knowledge allows designers and manufacturers to optimize production to achieve desired material properties and aesthetic qualities, potentially reducing post-processing steps.

What This Means for Your Design

Heating steel too hot before shaping it makes the surface rougher and less hard. Some greases don't work well at these high temperatures.

How to use in your project

1.Reference this study when discussing how temperature affects material properties in your design project, particularly for metal forming processes.

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Quick Cite

Paragraph starter

The influence of process parameters on material surface characteristics is well-documented. For instance, research by Hill, Turner, and Wardle (2020) demonstrated that increasing the soak temperature during steel forging from 1030°C to 1300°C led to a significant increase in surface roughness and a decrease in surface hardness, highlighting the critical role of temperature control in achieving desired material properties.

Source

The International Journal of Advanced Manufacturing Technology

The influence of soak temperature and forging lubricant on surface properties of steel forgings

journal · 2020

View source

Questions About This Research

What does the research say about higher forge soak temperatures increase surface roughness and decrease hardness in steel?: When designing steel forged components, carefully control the soak temperature to manage surface hardness and roughness. Select lubricants that are proven to withstand high forging temperatures to ensure consistent performance and desired surface finish. Evidence: The International Journal of Advanced Manufacturing Technology (2020).
Why does "Higher forge soak temperatures increase surface roughness and decrease hardness in steel" matter for design?: Understanding the impact of process parameters like soak temperature is crucial for controlling the surface integrity of forged components. This knowledge allows designers and manufacturers to optimize production to achieve desired material properties and aesthetic qualities, potentially reducing post-processing steps.
How can designers apply this research?: When designing steel forged components, carefully control the soak temperature to manage surface hardness and roughness. Select lubricants that are proven to withstand high forging temperatures to ensure consistent performance and desired surface finish.
What were the main findings?: Higher soak temperature (1300°C) resulted in lower surface hardness and higher surface roughness compared to the lower soak temperature (1030°C).. Water-based lubricants showed negligible difference from unlubricated samples, suggesting evaporation before forging.. Graphite-molybdenum disulphide grease led to higher surface roughness and non-symmetric distortion patterns.
What research method was used?: Experimental investigation.
How strong is the evidence?: Evidence strength is rated Strong effect, based on a 2020 journal from The International Journal of Advanced Manufacturing Technology.
What should I do differently in my next project?: When specifying forging processes for steel components, consider the trade-offs between achieving desired internal material properties at higher temperatures and the potential for increased surface defects. Conduct pilot tests with chosen lubricants to validate their performance under actual forging conditions.
What are the limitations?: The study focused on a specific alloy steel and a limited range of lubricants and temperatures. The effectiveness of lubricants may vary significantly with different materials and forging processes.