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如图1所示的C_2线,即急剧陡降的临界冷却曲线表明:在低速度和稍快速度下,是难于淬透钢件的,特别是对于厚钢件更是如此。上述冷却速度是能够获得全淬硬组织的最慢速度。决定所给定的钢件是否能获得全淬硬组织的一个重要因素是该钢的TTT图的“鼻尖”位置。有助于移动TTT图的“鼻尖”位置的任何因素,将改变钢的临界冷却速度,从而影响钢被淬硬的难易性。
The C 2 line shown in Figure 1, the sharply decreasing critical cooling curve, shows that it is difficult to quench the steel at low speeds and slightly faster speeds, especially for thick steel parts. The above cooling rate is the slowest rate at which fully hardened tissue can be obtained. An important factor in determining whether a given piece of steel can achieve fully hardened tissue is the “nose tip” position of the steel’s TTT chart. Any factor that helps to move the “nose tip” of the TTT plot will change the critical cooling rate of the steel, affecting the hardenability of the steel.