中厚板拉伸试样出现了延伸率不合问题,并且拉伸试样断口出现了层状撕裂现象.通过对试样断口形貌、试样变形区和未变形区金相组织的研究,认为:中厚板中心区域珠光体比例高是层状撕裂试样厚度中心呈现脆性的原因,这种脆性区导致在拉伸过程中最先萌生裂纹,并最终导致拉伸试样延伸率不合;出现层状撕裂的试样在拉伸之前并不存在结构上的分层和断口分层,在断口上出现的平行于轧制方向的裂纹是在拉伸过程中形成的;当珠光体带的宽度超过25μm时,试样在拉伸过程中在珠光体带中易出现裂纹并导致断口出现层状撕裂.
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