研究了轮箍低倍组织和连铸温度对白点敏感性、断裂韧性和氢致开裂门槛值的影响。结果表明，连铸温度对白点敏感性有影响，尾坯（低温）的白点敏感性略高于头坯（高温）。低倍组织对白点敏感性影响显著，柱状晶区的白点敏感性最低，等轴晶区的白点敏感性最高。但是，低倍组织和连铸温度对氢扩散、条件断裂韧性KIQ以及氢致开裂门槛值KIH均没有影响。
The effect of macrostructure and casting temperature on susceptibility to hydrogen flaking、the fracture toughness, KIQ, and threshold stress intensity factor of hydrogen induced delayed cracking, KIH, have been investigated. The result shows that casting temperature can influence the susceptibility to hydrogen flaking, which of the last billet is higher then that of the first billet. There is evident effect of macrostructure on the susceptibility to hydrogen flaking, which is the maximum in thezone of cylindrical grain and the minimum in the zone of equal-axis grain. There are no effect of the macrostructure and casting temperature on hydrogen diffusivity, Da, the fracture toughness, KIQ, and the threshold stress intensity factor of hydrogen-induced delayed cracking, KIH.
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