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本文在TTT曲线数值化的基础上探讨了由TTT曲线计算CCT曲线,由TTT曲线计算临界冷却速度以及用两种冷却介质获得理想冷却条件等三个实用课题。计算工作说明,由计算得到的CCT曲线(珠光体转变开始线)和实测结果吻合良好。这证明了钢的过冷奥氏体的等温转变和连续转变之间存在着某种联系,其中孕育期相对消耗量的积累效应是联系之一。计算工作也说明,由TTT曲线计算得到的临界冷却速度(获得完全马氏体的最低冷却速度)和实测值也十分接近。文中也探讨了利用两种冷却介质来获得理想冷却条件的基本原理和工艺参数的计算方法。这对于提高零件的冷却质量提供了一个新的途径。
Based on the numerical analysis of TTT curves, this paper discusses three practical topics of calculating CCT curve from TTT curve, calculating critical cooling rate from TTT curve and obtaining ideal cooling conditions with two kinds of cooling media. Calculation of work instructions, calculated by the CCT curve (pearlite transformation start line) and the measured results are in good agreement. This proves that there is a connection between the isothermal transformation and the continuous transformation of the supercooled austenite in steel, of which the cumulative effect of relative consumption of inoculation period is one of the links. The calculation also shows that the critical cooling rate calculated from the TTT curve (the lowest cooling rate for achieving complete martensite) is also close to the measured value. The paper also discusses the basic principle and process parameters calculation method of using two kinds of cooling media to get the ideal cooling condition. This provides a new way to improve the cooling quality of the part.