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铬镍钼钒钢广泛应用于学力机械制造,因为它具备必需的综合性能:强度、塑性、抗裂纹性,以及高的耐热性。最高强度钢(36X2H2MφA和38XH3MφA)主要用于制造高压容器的大尺寸紧固件。目前,由于苏联工业动力设备功率的不断增长,需要研制强度性能比标准技术文件(DOCT23304-78)规定值更高的紧固件钢。这类钢的传统热处理方法(淬火+回火)已不能进一步同时提高强度、塑性和韧性。文献指出,在低温回火后,38XH3MφA紧固件钢的强度可提高到σ_(0.2)≌1180N/mm~2,由于其临界脆性温度的提高,冲击韧性明显降
Chromium, nickel, molybdenum, vanadium steel is widely used in mechanical and mechanical learning, because it has the necessary combination of properties: strength, plasticity, crack resistance, and high heat resistance. The highest strength steels (36X2H2MφA and 38XH3MφA) are mainly used for large-size fasteners for the manufacture of high-pressure vessels. Currently, due to the increasing power of Soviet industrial power equipment, there is a need to develop fasteners steels with higher strength and performance ratings than the standard technical documents (DOCT 23304-78). The traditional heat treatment of such steels (quenching + tempering) has failed to further improve both strength, ductility and toughness. The literature points out that the strength of 38XH3MφA fastener steel can be increased to σ_ (0.2) ≌1180N / mm ~ 2 after low temperature tempering, and the impact toughness is obviously decreased due to the increase of critical brittleness temperature