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实验研究了0.06c-2.0Mn-0.14V 钢板的机械性能和显微组织。该钢采用1,000～1.300℃均热、660～800℃精轧以及63、74和80%的压下量控制轧制成13mm 厚的板材。均热温度为1,100℃的钢获得了强度和冲击性能相结合的最佳综合性能。在660℃和750℃以74%和80%压下量精轧的板材其屈服点为654～682兆牛顿/米~2。横向平台能为74～108雀耳。在660°～800℃以63%压下量精轧的板材的屈服点为449～525兆牛顿/米~2-2,冲击转变温度为-140～15℃,横向平台能为130～235焦耳均热温度升高到1,200和1,300℃时,轧制钢板的屈服点为511～658千牛顿/米~2,但冲击转变温度增高到-30°和65°。文章详细介绍了促进晶粒细化的加工条件、各种不同形式铁素体、劈裂断口和连续应力——应变曲线。并就各种工艺参数与沉淀强化、晶粒细化和位错亚组织强化的影响解释了产生这些机械性能的原因。钒强化的正火钢和铌强化的控轧钢的研究已获得成功。这是因为只要在现有的碳-锰钢中添加钒、铌元素,无需对钢的基本成份或工艺设备做很大变动,就可获得良好的机械性能。大多数控轧钢的研制均采用铌作为合金化元素,而其它元素只作为辅助添加元素或作为初步研究所定的成份中铌的替换元素。可以认为,这些研制在很大程度上是合理的。因为在一般含碳量的钢中用铌比用其它合金元素更容易达到晶粒细化,这是由于稳定的 Nbc沉淀物限制了晶粒长大、而且 Nb 比 V 和 Ti 能更有效地通过形变的非再结晶奥氏体的相变产生细晶粒铁素体。本研究中设计的钢成份使得能在控轧状态下,最有效地以钒细化晶粒和产生沉淀强化。为达此目的,将含碳量控制在较低水平,即相对于0.02%氮和0.14%钒,碳含量为0.06%,以便提高 VN 沉淀物的高温稳定性和抑制晶粒长大。锰含量提高到2%,以便降低奥氏体——铁素体的转变温度,使之有可能在低温下在奥氏体相区内进行轧制处理。
The mechanical properties and microstructure of 0.06c-2.0Mn-0.14V steel were experimentally studied. The steel was rolled into a 13 mm thick sheet by soaking at 1,000-1,300 ° C, finish rolling at 660-800 ° C, and reduction at 63, 74 and 80%. Steels with a soak temperature of 1,100 ° C give the best combination of strength and impact properties. The yield point of the sheet rolled at 660 ° C and 750 ° C at 74% and 80% reduction was 654-682 MegaNewtons / m 2. Horizontal platform for 74 ~ 108 bird ear. The yield point of the sheet rolled at a temperature of 660 ° to 800 ° C at a reduction of 63% is 449 to 525 MPa / m to 2-2, the impact transformation temperature is -140 to 15 ° C, and the transverse platform can be 130 to 235 J The soaking temperature increases to 1,200 and 1,300 ° C, the yield point of the rolled sheet is 511 to 658 kN / m 2, but the impact transformation temperature increases to -30 ° and 65 °. The article details the processing conditions for grain refinement, various forms of ferrite, splitting fracture and continuous stress-strain curve. The reasons for these mechanical properties are explained in terms of the influence of various process parameters on precipitation strengthening, grain refinement and dislocation sub-structure strengthening. Vanadium-reinforced normalized steel and niobium-strengthened rolled steel have been successfully studied. This is because as long as vanadium and niobium elements are added to the existing carbon-manganese steel, good mechanical properties can be obtained without greatly changing the basic composition of the steel or the process equipment. Most controlled rolled steels use niobium as the alloying element, while the other elements serve only as additional elements or as replacement elements for niobium in the preliminary study. It can be argued that these developments are largely justified. Because grain refinement is more easily achieved with niobium than with other alloying elements in a steel with a generally carbon content because stable Nbc precipitates limit grain growth and Nb passes more effectively than V and Ti Phase transformation of deformed, non-recrystallized austenite produces fine-grained ferrite. The steel composition designed in this study makes it possible to refine the grains and produce precipitation strengthening with vanadium most effectively in controlled rolling conditions. To this end, the carbon content is controlled to a low level, ie 0.06% carbon relative to 0.02% nitrogen and 0.14% vanadium in order to increase the high temperature stability of VN precipitates and to inhibit grain growth. Increasing the manganese content to 2% in order to reduce the austenite-ferrite transformation temperature makes it possible to carry out the rolling treatment in the austenite phase at a low temperature.