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首页> 外文会议>Fatigue and Fracture Mechanics: 35th volume >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：参考温度在评估HSLA-100钢断裂断裂中的应用

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The purpose of this study was to evaluate the fracture behavior of HSLA-100 steel at a temperature of -40℃ (-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℃ (-200℉), although the upper shelf Charpy energy for the HY-100 was lower than the HSLA-100 steels. Dynamic tear energies at -40℃ 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℃ (-24℉), with one composition of HSLA-100 coming in as low as -179℃ (-290℉) and another as high as -123℃(-190℉). Fracture toughness tests were conducted according to E 1820 at temperatures of -40, -29, and -18℃. These temperatures were more than 83℃ 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℃, 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：这项研究的目的是评估HSLA-100钢在-40℃（-40℉）温度下的断裂行为。对三种不同的成分和两种方向的HSLA-100进行了测试。还对HY-100进行了测试，以提供比较的基准。进行了各种与断裂有关的测试，包括传统的测试方法（例如夏比V型缺口和动态撕裂），以及最新的方法（例如，延性裂纹扩展引发（J_（ic））和参考温度）。夏比试验的转变温度都非常相似，大约为-129℃（-200℉），尽管HY-100的上部货架夏比能量低于HSLA-100钢。四种钢在-40℃时的动态撕裂能范围为800至1800J。根据ASTM E 1921测量，所有四种钢的平均参考温度为-151℃（-24℉）左右，其中一种成分为HSLA -100温度低至-179℃（-290℉），另一温度高至-123℃（-190℉）。根据E 1820在-40，-29和-18℃的温度下进行断裂韧性测试。这些温度比最高参考温度高出83℃以上，因此预期不会发生解理断裂。 HY-100样品的平均初始韧性为227 kJ / m〜2（1296 Ib / in。），并且在整个测试过程中，裂纹扩展仍保持韧性。尽管HSLA-100表现出的起始韧性是HY-100的两倍以上，但许多测试在韧性裂纹扩展量从0到1.85 mm（0.073英寸）变化后终止于乳沟断裂。这是基于-40℃的良好夏比和动态撕裂能以及较低的参考温度而得出的意外结果。 HSLA-100较高的起始韧性和抗撕裂性使断裂过程区域中产生了很高的应力。当发生韧性裂纹扩展时，断裂过程区席卷了越来越多的金属，这增加了劈裂断裂的可能性。结果表明，达到这些水平的裂纹驱动力所需的载荷可能高于典型结构的总截面屈服强度。在这种情况下，断裂之前会发生总截面屈服失效。借助故障评估图可以证明这一点。

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