Topic
Maraging steel
About: Maraging steel is a research topic. Over the lifetime, 1728 publications have been published within this topic receiving 19886 citations. The topic is also known as: martensitic ageing steel.
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TL;DR: In this article, a C-250 maraging steel manufactured by the flow forming technique was joined by the electron beam welding process and various post-welding heat treatments were conducted to improve the overall mechanical properties of the welded tubing.
Abstract: Seamless tubing of C-250 maraging steel manufactured by the flow forming technique was joined by the electron beam welding process. Various post-welding heat treatments were conducted to improve the overall mechanical properties of the welded tubing. For the 480°C/6 h/air cooling post-weld aging treated maraging steel, a significant increment of 11% reversion austenite was present in the weld metal. Only the tensile strength of this aging treated metal met the required specification while its percentage elongation reached only 50% of the specification, attaining only 35% of the strength of the parent metal. For the post-welded solution + aging treated maraging steel, only the yield strength met the specification. Moreover, a significant amount of reversion austenite pools was also present at the grain boundaries of the material located at the weld metal. Although the homogenisation treatment could improve the hardness of the weld metal, it failed to have the tensile strength of the steel met the s...
18 citations
TL;DR: In this article, a study that aims to modify the interfacial characteristics of maraging steel-H13 bimetal structures through heat treatment procedures was presented, where laser powder bed fusion (LPBF) was used to deposit steel powder (MS1) on H13 hot work tool steel blocks.
18 citations
15 Aug 1970
TL;DR: In this paper, a comparison of the response of selected structural steels to irradiation at 550 and 650F to high neutron fluences is presented, where the effects of oxygen and nitrogen contents on the radiation embrittlement sensitivity of 7-1/2Ni-Cr-Mo steel at 250F and 12Ni-5Cr-3Mo maraging steel weldments are investigated.
Abstract: : The report includes the following: (1) a comparison of the response of selected structural steels to irradiation at 550 and 650F to high neutron fluences, (2) the through-thickness Charpy-V notch ductility performance of a 10-1/2-in.-thick plate of irradiated A302-B steel, (3) an investigation of the effects of oxygen and nitrogen contents on the radiation embrittlement sensitivity of 7-1/2Ni-Cr-Mo steel at 250F, (4) the notch ductility behavior of irradiated 12Ni-5Cr-3Mo maraging steel weldments, (5) the response of A350-LF1 (Modified) steel to postirradiation annealing at temperatures in the range of 550 to 590F, (6) the notch ductility behavior of A350-LF1 (Modified) steel with cyclic 430F irradiation-168 hour annealing, (7) the preirradiation mechanical properties of the MH-1A reactor pressure vessel steel, (8) the notch ductility of several reactor structural steels after irradiation in a heavy water moderated reactor, (9) the modification, installation, and initial operation of a remotely operated, tape-controlled milling machine, and (10) a description of newly acquired remotely operated precision measuring equipment. (Author)
18 citations
TL;DR: In this article, the results showed that there is a temperature range where one can get some improvement in toughness without a large loss of mechanical strength, where the prior austenite grain size obtained by different solution annealing temperature influence in the final mechanical properties.
Abstract: Maraging 300 belongs to a family of metallic materials with extremely high mechanical strength and good toughness. Some works have been published about aging temperatures that improve ultimate strength resistance with acceptable toughness levels in this steel family, where the prior austenite grain size obtained by different solution annealing temperature influence in the final mechanical properties. Solution annealing temperatures ranging from 860 °C to 1150 oC and were kept constant until the aging temperature. These treatments were used in order to investigate their influence on the microstructure and mechanical properties of maraging steel 300, especially with regard to toughness. The characterization of the microstructure was performed by optical microscopy, scanning electron microscope (SEM) and X-ray diffraction (XRD). Mechanical properties were evaluated by Rockwell C hardness and Charpy impact tests. The results showed that there is a temperature range where one can get some improvement in toughness without a large loss of mechanical strength.
18 citations
TL;DR: In this article, a large diameter pressure vessel out of 18 Ni maraging steel by manual TIG welding, microcracks were noticed at the heat-affected zone (HAZ)/parent metal interface.
Abstract: During the fabrication of a large diameter pressure vessel out of 18 Ni maraging steel by manual TIG welding, microcracks were noticed at the heat-affected zone (HAZ)/parent metal interface. The location of these cracks was very different from those reported at the fusion zone/HAZ I interface due to “constitutional liquation”. Extensive optical metallography, scanning electron microscopy and energy dispersive X-ray analyses were carried out to identify the cause for the occurrence of these cracks. It is inferred from the experimental results that the microsegregation of titanium and nickel due to repeated thermal cycling during multipass welding led to the formation of TiC/Ti(CN) and stable austenite film on the grain boundaries. Under severe thermal stresses developed during welding, microvoids generated at the interface of TiC/Ti(CN) inclusions and austenite and further propagated intergranularly due to the premature failure of the austenite films.
18 citations