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采用定量相分析,硼自射线照象等技术,对不同含硼量的中碳钢40 MnB,在高温加热及冷却过程中,M_(23)(C,B)_6的溶解、析出行为及对钢性能的影响进行了研究。发现析出的M_(23)(C,B)_6的数量及粒度随着钢中的含硼量增加及冷却速度的减小而增加;含硼量不同的钢具有一个相同的临界冷却速度,在这一冷速下,M_(23)(C,B)_6,的析出量达到饱和。M_(23)(C,B)_6的溶解、析出对淬透性和韧性有很大影响。含硼量较低的钢,在相同条件下M_(23)(C,B)_6的析出量较小,且易于溶解,故钢具有较好的综合性能,并对热履历的变化不敏感。提出了一些稳定钢性能的建议。
Using quantitative phase analysis and boron self-radiography, the dissolution and precipitation behavior of M23C (C, B) _6 during the high temperature heating and cooling at 40 MnB of medium carbon steel with different boron content were studied. The impact of steel properties was studied. It was found that the amount and particle size of precipitated M_ (23) (C, B) _6 increased with the increase of boron content in steel and the decrease of cooling rate. Steel with different content of boron had the same critical cooling rate. At this cooling rate, the amount of precipitated M_ (23) (C, B) _6 is saturated. M_ (23) (C, B) _6 dissolution, precipitation on the hardenability and toughness have a significant impact. Under the same conditions, the content of M_ (23) (C, B) _6 is lower and the content of Boron is lower, which is easy to dissolve. Therefore, the steel has better comprehensive properties and is insensitive to the change of thermal history. Some suggestions for stabilizing steel performance are presented.