通过端淬试验、Z向硬度测试、显微组织和力学性能分析，研究了硼对60 mm厚Q690D钢淬透性和力学性能的影响。试验结果表明：微量固溶硼可显著提高60 mm厚Q690D钢的淬透性；和无硼的试验钢相比，含硼试验钢板厚1/4处的淬火组织由马/贝复相变成板条马氏体，淬火、回火态横截面上Z向最大硬度差分别由9、5HRC降低到4、3HRC，提高了Z向硬度的均匀性，同时含硼试验钢淬火、回火态的强度和韧性得到提高。
By jominy test, Z direction hardness test,microstructure and mechanical properties analysis,the effects of boron on hardenability and mechanical properties of 60 mm Q690D steel were studied. The results show that the trace so-lution boron can significantly improve the hardenability of 60 mm Q690D steel; compared with the experimental steel without boron addition,quenching microstructure of experimental steel with boron addition was transformed from mar-tensite/bainite complex phases to lath martensite at thickness of 1/4,the maximum hardness difference of Z direction at transverse section for quenching was reduced from 9HRC to 4HRC and that for tempering was reduced from 5HRC to 3HRC,which made the homogeneity of hardness at Z direction improved,as well as the strength and toughness for quenching and tempering of experimental steel with boron.
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