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首页> 外文会议>MD-vol.99; American Society of Mechanical Engineers(ASME) International Mechanical Engineering Congress and Exposition; 20041113-19; Anaheim,CA(US) >STUDY ON UNSTABLE BRITTLE CRACK-ARREST TOUGHNESS OF EXTREMELY-LOW CARBON BAINITIC STEEL PLATES
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STUDY ON UNSTABLE BRITTLE CRACK-ARREST TOUGHNESS OF EXTREMELY-LOW CARBON BAINITIC STEEL PLATES

机译：低碳贝氏体钢板不稳定脆性裂纹韧性的研究

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摘要

The extremely-low carbon bainitic steel (ELCB steel) is a high strength steel with about 0.02 mass% or less carbon. In this research, unstable brittle crack arrest toughness of ELCB steel plates was investigated by temperature-gradient ESSO tests, compared with that of conventional TMCP steel plates. Both of ELCB and TMCP steel plates without pre-straining had sufficient crack-arrest toughness at 0℃. After 100% pre-straining, the TMCP steel plate had not sufficient crack-arrest toughness at 0℃. The ELCB steel plates, however, maintained high crack arrest toughness at 0℃ even after 10% pre-straining. ELCB steels were also different from TMCP steels in the correlation between transition temperature of crack arrest toughness and fracture appearance transition temperature (vTrs) obtained by Charpy impact test. When the vTrs of an ELCB steel and that of a TMCP steel were the same value, crack arrest toughness of an ELCB steel was higher than that of a TMCP steel. In the cross section of the ESSO test piece of the ELCB steels, many sub-cracks and micro-crack branching were observed. However, in the cross section of the ESSO test piece of the conventional TMCP steels, there were few sub-cracks and branching. Initiation of sub-cracks and branching around the main crack tip reduces the stress intensity factor of the main crack. It was considered that the above features of the ELCB steel were caused by initiation of sub-cracks and branching at the tip of the main brittle crack.
机译：极低碳贝氏体钢（ELCB钢）是一种高强度钢，碳含量约为0.02质量％或更少。在这项研究中，通过温度梯度ESSO测试，与常规TMCP钢板相比，研究了ELCB钢板的不稳定脆性裂纹止裂韧性。没有预应变的ELCB和TMCP钢板在0℃时都具有足够的抗裂韧性。经过100％的预应变后，TMCP钢板在0℃时没有足够的抗裂韧性。然而，即使经过10％的预应变，ELCB钢板在0℃仍能保持较高的抗裂韧性。 ELCB钢与TMCP钢的不同之处还在于，通过夏比冲击试验获得的抗裂韧性的转变温度与断裂外观转变温度（vTrs）之间的相关性。当ELCB钢的vTrs和TMCP钢的vTrs相同时，ELCB钢的抗裂韧性比TMCP钢高。在ELCB钢的ESSO测试件的横截面中，观察到许多子裂纹和微裂纹分支。然而，在常规TMCP钢的ESSO测试件的横截面上，几乎没有子裂纹和分支。子裂纹的产生和主裂纹尖端周围的分支降低了主裂纹的应力强度因子。认为ELCB钢的上述特征是由子裂纹的产生和主脆性裂纹尖端的分支引起的。

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