无论淬火介质怎么冷，如果在大工件中的热量不能比特定的临界速率更快散发，那它内部硬度就会受到明确限制。
No matter how cool the quenching medium may be, if the heat inside a large piece cannot escape faster than a certain critical rate, there is a definite limit to the inside hardness.
而其临界切削厚度与材料的硬度有关。
And its critical cutting thickness and hardness of the material relevant.
研究表明，通过亚临界热处理可以使含有大量残留奥氏体的高铬铸铁产生二次硬化，从而提高高铬铸铁的硬度和耐磨性。
The Influence of the quenching and tempering treatment and the different subcritical treatment on microstrcture and property of a high alloy white cast iron was studied.
研究表明，通过亚临界热处理可以使含有大量残留奥氏体的高铬铸铁产生二次硬化，从而提高高铬铸铁的硬度和耐磨性。
The hardening behavior and abrasion resistance of high chromium cast iron (HCCI) containing molybdenum and vanadium subjected to sub-critical treatment were studied.
研究表明，通过亚临界热处理可以使含有大量残留奥氏体的高铬铸铁产生二次硬化，从而提高高铬铸铁的硬度和耐磨性。
The hardening behavior and abrasion resistance of high chromium cast iron (HCCI) containing molybdenum and vanadium subjected to sub-critical treatment were studied.
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