Characterization of the Q* parameter for evaluating creep crack growth rate for type 316LN stainless steel
Characterization of the Q* parameter for evaluating creep crack growth rate for type 316LN stainless steel
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DOI：
10.1007/s12206-016-0625-4
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发表时间：
2016-07-01
影响因子：
1.6
通讯作者：
Kim, Eung-Seon
中科院分区：
文献类型：
--
作者：
Ekaputra, I. M. W.;Kim, Woo-Gon;Kim, Eung-Seon
在这项研究中，Q* 参数的特点，以评估316 LN型不锈钢的蠕变裂纹扩展速率（CCGR）。蠕变裂纹扩展（CCG）数据是通过在600A ℃下不同施加载荷下的CCG试验获得的。在550 A ℃下进行了额外的CCG测试，以研究应力强度因子的可能温度依赖性。提出了一个用Q* 参数评价CCGR的公式，并对该参数进行了表征，并与常用的典型C* 断裂参数进行了比较。Q* 参数表现出良好的线性数据，表现出非线性诱导的双重值在早期阶段。Q* 参数适用于表征CCGR，而与不同的施加载荷和钢的类型无关。此外，裂纹附近的断裂组织显示出典型的沿晶断裂模式，这种断裂主要沿沿着扩展。裂纹是由孔洞的长大和连通引起的，这是由于析出物沿沿着形成所致。
In this study, the Q* parameter was characterized to evaluate the Creep crack growth rate (CCGR) of type 316LN stainless steel. Creep crack growth (CCG) data were obtained by CCG tests under different applied loads at 600A degrees C. An additional CCG test was conducted at 550A degrees C to investigate the possible temperature dependence of the stress intensity factor. An equation using the Q* parameter for evaluating CCGR was proposed, and this parameter was characterized and compared with the typical C* fracture parameter, which is commonly used. The Q* parameter exhibited good linearity of the data, exhibiting no nonlinearity-induced dual value at the early stage. The Q* parameter was suitable for characterizing the CCGR regardless of different applied loads and types of steels. In addition, fracture microstructures near the crack revealed a typical intergranular fracture mode, and this fracture was dominantly propagated along the grain boundary. The cracks were developed by the growth and interlinking of cavities, which were attributed to the precipitates forming along the grain boundary.