摘要
本研究工作采用硼自射线照像技术,使用了 SSNTD(CAB)[固体核径迹探测器(为醋酸纤维)]检测 B 放射性同位素的重新分布.由此研究了 ppm 数量级的 B 对合金淬透性的贡献.研究时发现在高温臭氏体化过程中硼偏聚消失,含硼合金在淬火过程中产生的硼在晶界的偏聚为一非平衡热力学过程.奥氏体化后,偏聚程度随淬火温度的升高而增加,在晶界附近出现贫硼区,是晶界非平衡偏聚之突出特征.研究结果表明:微量硼对提高合金的淬透性是有利的.
In this paper,we detect the redistribution of the B radiative isotope by using the boron self- ray photography and SSNTD(CAB),and study the contribution of the boron at ppm amount lev- el to the hardenability of alloys.It is found that in the process of the high temperature ausform the boron skew-concourse vanishes and the grain boundary shew-concourse which alloys containing the boron generate in the process of the hardening is a non-equilibrium thermodynamic process.It is the remarkable characteristic of the grain boundary non-equilibrium skew-concourse that after ausform the degree of the skew-concourse increases with the rise in the quenching temperature and the scarce boron area appears near the grain boundary.Finally,we study the production and dissolution of the phase containing boron Fe_(23)(C,B)_6 and show that the microboron helps to im- prove the hardenability of alloys.
关键词
微量元素
硼
合金
淬透性
钢
淬火
self-rey photography
hardenability
dissolution and production
the skew-concourse
distribution
