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采用Ｇｌｅｅｂｌｅ－１５００热模拟实验机测试了宝钢生产的易出现角横裂纹缺陷的中碳铝硅镇静钢ＧＲ４１５１连铸坯的高温延塑性，并通过金相、扫描电镜等方法对拉断后试样的断口及组织形貌进行了分析检验，结果表明：ＧＲ４１５１钢在熔点～７００℃的温度区间存在２个脆性区域，即熔点～１３３０℃的第Ⅰ脆性区和８６０～７４０℃的第Ⅲ脆性区，第Ⅲ脆性区内，γ单相域ＡｌＮ等氮化物在γ晶界析出和在γ＋α两相区先共析铁素体呈网状并在γ晶界析出是造成脆化的主要原因，本文还提出了避免产生角横裂纹缺陷的措施。
The high temperature ductility of medium carbon aluminum silicon killed GR4151 continuous casting slab with corner transverse crack defects produced by Baosteel was tested by Gleeble-1500 thermal simulation test machine. The tensile test specimens The results show that there are two brittle zones in the temperature range of melting point to 700 ℃, namely the first brittle zone of melting point ~ 1330 ℃ and the third brittle zone of 860 ~ 740 ℃, In the first brittle zone, the precipitation of nitrides, such as γ-single-phase AlN, in the γ grain boundaries and the proeutectoid ferrite in the γ + α two-phase region and the precipitates in the γ grain boundaries are the main causes of embrittlement. Proposed to avoid the corner transverse crack defects measures.