高淬透性硼微合金化特厚板钢成分优化设计

海洋工程用特厚板钢通常要求具有良好的淬透性，合理设计此类钢化学成分是改善其淬透性的主要方法之一。传统钢成分设计大多以实验为主，耗费巨大。本文以热力学计算软件Thermo-Calc和材料性能计算软件JMatPro为工具，采用计算、预测与实验相结合的研究模式，对含B微合金化特厚板钢进行成分优化，以期获得高淬透性能。使用Thermo-Calc计算了B微合金化钢的热力学平衡析出相。通过对析出相的析出温度、析出量及相间关系分析，阐述了此类钢的成分设计原则，给出了可获得高淬透性的B微合金化钢的设计成分。采用JMatPro对设计钢淬透性进行预测，预测结果很好地说明了设计钢成分的合理性。经过淬透性实验和化学相分析，进一步肯定了优化设计结果。理论计算与实验结果表明高铝含量有利于改善硼微合金化钢淬透性。

Composition optimization design of boron-microalloying ultra-heavy plate steel with high hardenability

Ultra-heavy plate steel for marine engineering usually requires good hardenability, and rational design of chemical composition of this steel is one of the main methods for improving its hardenability. Traditional composition design of steel is mostly ex-periment-based and costly. In this paper, thermodynamic calculation software Thermo-Calc and material property calculation software JMatPro were introduced to design the chemical composition of B-containing micro-alloyed ultra-heavy plate steel, with calculation, prediction and testing combined to obtain high hardenability. Thermodynamic equilibrium precipitates in the steel were calculated with Thermo-Calc. Composition design principles were interpreted for the steel from the perspective of thermodynamics by analyzing the precipitation temperature;precipitation amount and phase relationships, and then the chemical composition of the steel with high hard-enability was designed. In addition, the hardenability of the steel designed was predicted using JMatPro and the results illustrates that the composition design of the steel is feasible. The rationality of the optimization design was further affirmed by hardenability testing and chemical analysis. Theoretical calculation and experimental results show that high aluminum content can help to improve the hard-enability of the steel.