How Do You Calculate Hardness from Concentration Using Fick's Second Law?

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Discussion Overview

The discussion revolves around calculating hardness from concentration using Fick's Second Law, specifically in the context of steel. Participants explore the relationship between concentration and hardness, as well as the variables involved in the process.

Discussion Character

  • Homework-related, Exploratory, Technical explanation

Main Points Raised

  • One participant expresses uncertainty about how to approach the problem and seeks assistance.
  • Another participant asks for clarification on the problem's requirements and the variables affecting the process in steel.
  • Some participants suggest that the task involves plotting concentration versus depth and then deriving hardness versus depth from that plot.
  • There is mention of specific variables such as D, D_0, Q_d, R, and T, which are relevant for calculating concentration using Fick's Second Law.
  • One participant reiterates the need to calculate concentration as a function of depth before determining hardness based on a graph relating hardness to concentration.

Areas of Agreement / Disagreement

Participants generally agree on the need to plot concentration versus depth and then hardness versus depth, but there is no consensus on the exact steps to take or how to relate concentration to hardness.

Contextual Notes

Participants have not fully defined the assumptions underlying their calculations or the specific relationships between the variables involved. There are also unresolved questions about how to accurately derive hardness from the concentration data.

kpx001
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Can anyone help me solve this problem? I am unsure on what to do
http://yfrog.com/j5flicks2ndp
 
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Can you explain in your own words what the problem is asking? What is happening in the steel, and what variables does the process depend on?
 
i am guessing that they want me to use the graph to get another plot with concentration vs depth... then from that i am to get hardness vs depth. other than that i am confused as well. i have D and D_0 and Q_d and R and T. from this i can get concentration using flicks 2nd law.. but what about hardness and all that?
 
kpx001 said:
i am guessing that they want me to use the graph to get another plot with concentration vs depth... then from that i am to get hardness vs depth. other than that i am confused as well. i have D and D_0 and Q_d and R and T. from this i can get concentration using flicks 2nd law.. but what about hardness and all that?

It looks to me like you're supposed to calculate the concentration as a function of depth, then determine the hardness as a function of depth based on the graph of hardness as a function of concentration.
 

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