Cleavage initiation in the intercritically reheated coarse-grained heat-affected zone: Part I. Fractographic evidence

The Role of the Bainitic Packet in Control of Impact Toughness in a Simulated CGHAZ of X90 Pipeline Steel

“…The fracture surfaces all present cleavage fracture for the samples with different heat inputs, and the average cleavage facet size decreases when the heat input is decreased. 3 The average bainite packet size for the CGHAZ is nearly equal to the average cleavage facet size, and the bainite packet boundary can strongly impede the crack propagation, indicating that the bainitic packet is the most effective unit in control of impact toughness in the simulated CGHAZ of X90 pipeline steel.…”

“…With the further application of pipeline steels for long distance transportation and in harsh environments, the combination of excellent toughness and weldability becomes more and more important, in addition to high strength [2]. However, the balance of high strength and good toughness in steels can be disturbed by the thermal cycles experienced during welding, resulting in the poor toughness of local areas [3]. Particularly, the toughness in the coarse grain heat affected zone (CGHAZ) of high grade pipeline steels deteriorates severely after the welding thermal cycle [4].…”

Effect of Martensite–Austenite Constituent on Low-Temperature Toughness in YS 500 MPa Grade Steel Welds

“…The micro-mechanism of cleavage cracks in simulated HAZs is controlled by the size and volume fraction of the martensite-austenite (M-A) constituent [10,11]. Furthermore, it should be noted that the morphologies of M-A constituents are sensitive to cleavage cracking [12,13]. The M-A constituents can exhibit various morphologies such as massive, slender, and small dot cleavage cracking [12,13].…”

“…Furthermore, it should be noted that the morphologies of M-A constituents are sensitive to cleavage cracking [12,13]. The M-A constituents can exhibit various morphologies such as massive, slender, and small dot cleavage cracking [12,13]. The M-A constituents can exhibit various morphologies such as massive, slender, and small dot shapes [14,15].…”

Leakage Causes Analysis on a Boiler Enclosure Wall Superheater

“…Boiler four-tube leakage happened frequently and was the main reason of forced outage in thermal generator unit leading to huge damage and economic loss [1][2][3][4]. In order to ensure the safe and economic operation of the power plant and avoid similar event happening, it is very significant to carry out cause analysis and provide proper measurements in time.…”