Question

A heat treatment process that is used to harden steel components is examined. The process has four parameters. Which parameter(s) have the greatest impact on the hardness of steel components? Which parameter(s) have the least impact on the hardness of steel components? Why? (Please show all necessary calculations)

Parameter Number	Parameters	Level 1	Level 2
1	Temperature (C)	750	900
2	Cooling time (s)	50	300
3	Carbon Contents (Wt%c)	1	6
4	CO2 Concentration (%)	7	25

OA is designed as follows:

Treatment Condition	Temperature	Cooling Time	Carbon Contents	CO2 Concentration	Results
1	1	1	1	1	140
2	2	1	1	1	155
3	1	2	1	1	181
4	2	2	1	1	198
5	1	1	2	2	140
6	2	1	2	2	133
7	1	2	2	2	134
8	2	2	2	2	211
9	1	1	1	2	219
10	2	1	1	2	146
11	1	2	1	2	198
12	2	2	1	2	174
13	1	1	2	1	183
14	2	1	2	1	129
15	1	2	2	1	192
16	2	2	2	1	210

Answer 1

It is observed in treatment 9, that the concentration of CO2 is the one that most affects the hardness of the components.

It is observed in treatment 2, that the temperature is the least affecting the hardness of the components.

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