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首页> 外文会议>International ASTM/ESIS Symposium on Fatigue and Fracture >Application of the Reference Temperature to the Evaluation of Cleavage Fracture in HSLA-100 Steel
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Application of the Reference Temperature to the Evaluation of Cleavage Fracture in HSLA-100 Steel

机译：参考温度在HSLA-100钢中裂解裂缝评价的应用

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The purpose of this study was to evaluate the fracture behavior of HSLA-100 steel at a temperature of -40°C (-40℉). Tests were conducted on three different compositions and two orientations of HSLA-100. HY-100 was also tested to provide a baseline for comparison. Various fracture-related tests were conducted, including traditional test methods, such as the Charpy V-notch and the Dynamic Tear, and more recent methods, such as ductile crack growth initiation (J_(ic)) and the reference temperature. Transition temperatures from the Charpy tests were all very similar, falling around -129°C (-200℉), although the upper shelf Charpy energy for the HY-100 was lower than the HSLA-100 steels. Dynamic tear energies at -40°C for the four steels ranged from 800 to 1800 J. The average reference temperature of all four steels, measured according to ASTM E 1921, was around -151°C (-24℉), with one composition of HSLA-100 coming in as low as -179°C (-290℉) and another as high as -123°C(-190℉). Fracture toughness tests were conducted according to E 1820 at temperatures of -40, -29, and -18°C. These temperatures were more than 83°C above the highest of the reference temperatures, so cleavage fracture was not expected to occur. The HY-100 specimens exhibited an average initiation toughness of 227 kJ/m~2 (1296 Ib/in.) and crack growth remained ductile throughout the tests. Even though the HSLA-100 exhibited initiation toughnesses more than twice as high as the HY-100, many of the tests terminated in cleavage fracture after amounts of ductile crack growth varying from 0 to 1.85 mm (0.073 in.). This was an unexpected result based on good Charpy and dynamic tear energies at -40°C, and low reference temperatures. The higher initiation toughness and tearing resistance of HSLA-100 allowed very high stresses to develop in the fracture process zone. As ductile crack growth occurred, the fracture process zone swept through an increasing volume of metal, which increased the probability of cleavage fracture. It is shown that the load required to reach these levels of crack driving force may be above gross section yielding of a typical structure. In this case failure by gross section yielding would occur before fracture. This is demonstrated with the aid of a failure assessment diagram.
机译：本研究的目的是在-40℃（-40°）的温度下评估HSLA-100钢的断裂行为。在三种不同的组合物和HSLA-100的两个取向上进行测试。还测试了HY-100以提供基线进行比较。进行各种骨折相关的测试，包括传统的测试方法，例如夏比V-intch和动态撕裂，以及最近的方法，例如延性裂纹生长起始（J_（IC））和参考温度。来自夏奇的测试的过渡温度都非常相似，落在-129°C（-200°）左右，尽管Hy-100的上架钓鱼能量低于HSLA-100钢。用于40°C的动态撕裂能量为800至1800架。根据ASTM E 1921测量的所有四个钢的平均参考温度约为-151°C（-24‰），其中一个组合物HSLA-100进入低至-179°C（-290°），另一个高达-123°C（-190°）。根据E 1820在-40，-29和-18℃的温度下进行断裂韧性试验。这些温度超过83℃，高于参考温度的最高温度，因此预计不会发生裂解骨折。 HY-100试样表现出227kJ / m〜2（1296 IB / in）的平均起始韧性。在整个测试中，裂纹生长仍然存在延性。即使HSLA-100表现出高于HY-100的2多倍以上的韧性，许多试验在延展性裂纹生长的量，从0至1.85mm（0.073英寸）的延性裂纹生长量呈裂解骨折终止。这是基于-40°C的良好夏比和动态撕裂能量和低参考温度的意外结果。 HSLA-100的较高的起始韧性和撕裂抗性允许在裂缝过程区中产生非常高的应力。由于发生延性裂纹生长，裂缝处理区扫过了不断增加的金属体积，这增加了切割骨折的概率。结果表明，达到这些裂纹驱动力所需的负载可以高于典型结构的总部分。在这种情况下，由于骨折之前，屈服会产生屈服。借助于失败评估图来证明这一点。

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