Microstructure and high-temperature dry sliding wear at 600~C in ambient air of austenitic heat-resistant steel ZG40Cr25Ni20 with different contents(mass percent)of AI(0 to 7.10~)have been investigated.The results sho...Microstructure and high-temperature dry sliding wear at 600~C in ambient air of austenitic heat-resistant steel ZG40Cr25Ni20 with different contents(mass percent)of AI(0 to 7.10~)have been investigated.The results show that microstructures of 4.68%and 7.10%A1 addition content consist of the matrix and reinforcement of inter-metallic compound y'and carbide,while microstructures of ZG40Cr25Ni20 without A1 and with A1 of 1.68%are ab-sent of y'.Higher wear resistance than the original ZG40Cr25Ni20 alloy is achieved in alloys with higher content of A1 under the same high-temperature wear test condition.The wear rates of Fe-25Cr-20Ni-7.10A1 and Fe-25Cr-20Ni-4.68A1 are only 20.83%and 45.83%of that of Fe-25Cr-20Ni,respectively.Heat-resistant steels with higher con-tents of AI(4.72%and 7.10%)have higher hardness than those with lower contents of AI(1.68%and 0).Wear mechanisms of ZG40Cr25Ni20 are considered as severe plough plastic deformation and slight adhesive.However,wear mechanisms of Fe-25Cr-20Ni 4.68A1 are light micro-cutting and oxidation-wear,while that of Fe-25Cr-20Ni-7.10A1 are severe adhesive transfer and oxidation-wear.展开更多
文摘Microstructure and high-temperature dry sliding wear at 600~C in ambient air of austenitic heat-resistant steel ZG40Cr25Ni20 with different contents(mass percent)of AI(0 to 7.10~)have been investigated.The results show that microstructures of 4.68%and 7.10%A1 addition content consist of the matrix and reinforcement of inter-metallic compound y'and carbide,while microstructures of ZG40Cr25Ni20 without A1 and with A1 of 1.68%are ab-sent of y'.Higher wear resistance than the original ZG40Cr25Ni20 alloy is achieved in alloys with higher content of A1 under the same high-temperature wear test condition.The wear rates of Fe-25Cr-20Ni-7.10A1 and Fe-25Cr-20Ni-4.68A1 are only 20.83%and 45.83%of that of Fe-25Cr-20Ni,respectively.Heat-resistant steels with higher con-tents of AI(4.72%and 7.10%)have higher hardness than those with lower contents of AI(1.68%and 0).Wear mechanisms of ZG40Cr25Ni20 are considered as severe plough plastic deformation and slight adhesive.However,wear mechanisms of Fe-25Cr-20Ni 4.68A1 are light micro-cutting and oxidation-wear,while that of Fe-25Cr-20Ni-7.10A1 are severe adhesive transfer and oxidation-wear.
