Standard

Order

Run

Order

Temperature

(˚C)

Soaking Time

(hrs)

Particle Size

(µm)

Average Microhardness (HRB)

S/N Ratio of Hardness (dB)

6

1

870

3

45

85

38.59

5

2

870

6

60

81

38.17

1

3

870

9

90

86

38.69

3

4

910

3

60

88

38.89

9

5

910

6

90

91

39.18

8

6

910

9

45

92

39.28

2

7

940

3

90

88

38.89

7

8

940

6

45

89

39.99

4

9

940

9

60

84

38.49