Effect of Normalizing Cooling Method on Microstructure and Mechanical Properties of 9%Cr Ferritic Heat Resistant Steel
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摘要: 采取油冷和水冷2种冷却方式对9%Cr铁素体耐热钢进行正火处理,再进行回火,研究了正火冷却方式对该钢组织和力学性能的影响。结果表明:与水冷相比,油冷处理后试验钢的马氏体板条宽度较大,位错密度较小,晶界上析出的M23C6碳化物尺寸较小;与水冷相比,油冷处理后试验钢的屈服强度、抗拉强度、断后伸长率以及上平台冲击吸收功分别提高了9.3%,4.7%,6.1%,5.4%,韧脆转变温度降低了17.7 ℃,拉伸性能和冲击性能提高。
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关键词:
- 冷却方式 /
- 9%Cr铁素体耐热钢 /
- 力学性能 /
- 显微组织
Abstract: The 9%Cr ferritic heat resistant steel was normalized by oil cooling and water cooling, and then was tempered. The effects of normalizing cooling methods on the microstructure and mechanical properties of the test steel were studied. The results show that compared with those by water cooling, the strip width of the martensitic slats of the test steel by oil cooling was larger, the dislocation density was smaller, and the size of M23C6 carbide precipitated on the grain boundary was smaller. Compared with those by water cooling, the yield strength, tensile strength, percentage elongation after facture and impact absorption work on the upper platform of the test steel by oil cooling increased by 9.3%, 4.7%, 6.1%, 5.4%, respectively, and the tough-brittle transition temperature was reduced by 17.7 ℃; the tensile properties and impact properties were enhanced. -
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