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The effects of heat treatment process on the microstructure and properties of 60Cr2MnMoNi steel are studied as well as the changes of microstructure and properties of samples at different states are compared and analyzed with TV-4X metallographic microscope, R(D)-150A1 material hardness tester, N1500C material impact testing machine and INSTRON5989 electronic universal material testing machine. The results showed that the as-cast microstructure of 60Cr2MnMoNi steel was P+B+A(residual)+carbide, average hardness was 28.1 HRC, average impact toughness was 15.4 J/cm2, tensile strength was 795.9 MPa, yield strength was 458.1 MPa, elongation was 2.6% and reduction of area was 1.1%; the annealed microstructure was F(a little)+P+carbide, average hardness was 24.5 HRC, average impact toughness was 193.4 J/cm2, tensile strength was 846.6 MPa, yield strength was 443.1 MPa, elongation was 17.5% and reduction of area was 25.3%; the quenched microstructure was B+M+A(residual)+carbide, average hardness was 58.1 HRC, average impact toughness was 14.5 J/cm2, tensile strength was 1 442.6 MPa, yield strength was 1 186.4 MPa, elongation was 2.7% and reduction of area was 1.8%; the tempered microstructure was S(temper)+B+carbide, average hardness was 45.1 HRC, average impact toughness was 64.9 J/cm2, tensile strength was 1 389.5 MPa, yield strength was 1 004.4 MPa, elongation was 7.4% and reduction of area was 10.9%. The microstructure and properties of 60Cr2MnMoNi steel are changed through different heat treatment processes so that the performance requirements of spare parts for equipment in service under different operating conditions could be met.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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