Wear Behavior of Duplex Stainless Steels Sintered …
225
Table 1 Chemical constituents of stainless steels powders
Powder grade
Elements (%wt)
Cr
Ni
C
Si
Mn
Mo
Fe
310L
24
10
0.02
0.30
2.00
0.3
Balance
430L
16.6
–
0.02
1.20
0.10
–
Balance
Table 2 Chemical constituents of DSS
Composition Elemental concentration (%wt)
Ni
Cr
C
Si
Mn
Mo
Fe
Ni eq Cr eq
PREN
DSS A
5
20.3 0.02
0.75 1.05
0.15 Bal. 6.1
21.57 20.53
DSS B
8.5 23.3 0.018 0.67 0.945 1.13 Bal. 9.51 25.41 27.01
DSS A: 50% 310L + 50% 430 L
DSS B: 45% 310L + 45% 430 L +4Ni + 5Cr +1 Mo
(BIRSON, 100 T), the green compacts are sintered at a temperature of 1350 °C.
Sintered compacts underwent forging operation at 1150 °C and quenched in water
immediately. The chemical constituents of 430 L and 310 L powders are shown in
Table 1. The chemical constituents of the two DSS are given in Table 2.
The chemical composition of DSS A is 20 Cr-5Ni and DSS B is 23.2Cr-8.5Ni.
Wear testing was carried out at room temperature under two different loads 20 N and
30 N with constant sliding velocity and sliding distance of 2 m/s, 750 m, respectively,
based on the previous work done in DSS.
2.1 Wear Test—Pin on Disc Machine
A Pin-on-disc wear testing machine (M/s METMECH, Chennai) was used for the
research work for finding the sliding wear characteristics of the PM duplex stainless
steel preforms. The key variables influencing friction and wear are sliding velocity,
sliding distance, load, and temperature conditions.
The wear test machine consists of a rotating spindle connected to the disc by M6
counter bolt. A pivoted hanging arm has the provision for inserting pin and holder
to bring them to have access to the track diameter. The pin was firmly fixed in the
holder with the help of screw. The arm of the lever made to rest on that disc after
confirmation of the track diameter. Loads were added to the arm one after another,
after setting the duration of the test.
The pin size was 3 mm in radius and 34 mm in length. Duplex stainless steels
were used as the pin material, counterface disc with 32.5 radius and 10 mm thickness
was prepared from high carbon high chromium steel (die steel). The disc and the
pin were washed through acetone to confirm that the wear tests were done under dry
sliding conditions. The hardness of the counter disc is 62 HRC whereas the hardness
225
Table 1 Chemical constituents of stainless steels powders
Powder grade
Elements (%wt)
Cr
Ni
C
Si
Mn
Mo
Fe
310L
24
10
0.02
0.30
2.00
0.3
Balance
430L
16.6
–
0.02
1.20
0.10
–
Balance
Table 2 Chemical constituents of DSS
Composition Elemental concentration (%wt)
Ni
Cr
C
Si
Mn
Mo
Fe
Ni eq Cr eq
PREN
DSS A
5
20.3 0.02
0.75 1.05
0.15 Bal. 6.1
21.57 20.53
DSS B
8.5 23.3 0.018 0.67 0.945 1.13 Bal. 9.51 25.41 27.01
DSS A: 50% 310L + 50% 430 L
DSS B: 45% 310L + 45% 430 L +4Ni + 5Cr +1 Mo
(BIRSON, 100 T), the green compacts are sintered at a temperature of 1350 °C.
Sintered compacts underwent forging operation at 1150 °C and quenched in water
immediately. The chemical constituents of 430 L and 310 L powders are shown in
Table 1. The chemical constituents of the two DSS are given in Table 2.
The chemical composition of DSS A is 20 Cr-5Ni and DSS B is 23.2Cr-8.5Ni.
Wear testing was carried out at room temperature under two different loads 20 N and
30 N with constant sliding velocity and sliding distance of 2 m/s, 750 m, respectively,
based on the previous work done in DSS.
2.1 Wear Test—Pin on Disc Machine
A Pin-on-disc wear testing machine (M/s METMECH, Chennai) was used for the
research work for finding the sliding wear characteristics of the PM duplex stainless
steel preforms. The key variables influencing friction and wear are sliding velocity,
sliding distance, load, and temperature conditions.
The wear test machine consists of a rotating spindle connected to the disc by M6
counter bolt. A pivoted hanging arm has the provision for inserting pin and holder
to bring them to have access to the track diameter. The pin was firmly fixed in the
holder with the help of screw. The arm of the lever made to rest on that disc after
confirmation of the track diameter. Loads were added to the arm one after another,
after setting the duration of the test.
The pin size was 3 mm in radius and 34 mm in length. Duplex stainless steels
were used as the pin material, counterface disc with 32.5 radius and 10 mm thickness
was prepared from high carbon high chromium steel (die steel). The disc and the
pin were washed through acetone to confirm that the wear tests were done under dry
sliding conditions. The hardness of the counter disc is 62 HRC whereas the hardness