Nanostructured bainitic steels with carbide precipitations - a new steel class

European Congress and Exhibition on Avanced Materials and ProcessRecent work [1] on the tempering behaviour of nanostructured bainite has demonstrated the particularly interesting tempering resistance of this microstructure. Tempering of high Si nanostructured bainite at an adequate temperature will not destroy it´s unique nanostructure on the contrary supersaturated and metastable phase will tend to equilibrium und therefore reduce internal stresses. Taking these in to account tempering offers a new perspective in the ability to tailor the mechanical properties. The present work is about combining the increasingly well-known performances of nanostructured bainitic steels with a secondary precipitation mechanism. These are based on a previously investigated material (0.65C-1.25Mn-1.5Si-0.75Cr wt%) modified with additions of Mo and V. Mo and V addition does not influence nanostructured bainite formation but changes secondary hardening behavior strongly. Mechanical behavior esp. at elevated temperatures is enhanced due to addition of Mo and V. Steel and process design as well as mechanical properties up to 250°C of 5 different nanostructured bainitic steels grade with different Mo and V addition will be discussed. Results will be compared to conditions without secondary carbide formers and martensitic conditions. Conclusions: We will present the main achievements so far obtained under the auspices of a Research Fund for Coal and Steel (RFCS) project, STEELSECO

Final Technical. Report Part B

Project Number: RFCS-RPJ-2016-754070.The aim of this project is to investigate the microstructure evolution due to tempering of nanobainitic steels and their properties including fatigue properties at elevated service temperatures up to 250°C. Furthermore this project will be the first attempt to evaluate the potential of a new class of steel combining nanostructured bainitic steels with secondary precipitation. This entirely novel approach may indeed lead to a material that combines the excellent and increasingly well-known performances of nanostructured bainitic materials, with an improved potential for use at elevated temperatures. Intrinsic tempering resistance of nanostructured bainitic microstructure will be enhanced by adding secondary precipitating elements to create a new class of steel material with expected exceptional properties for service at moderate temperatures. Indeed, it is hoped that this yet untested combination will lead to an economical yet very high performance material for use at elevated temperatures. In comparison with nanostructured bainitic microstructure also steels with conventional QT matrix will be investigated.Research Fund for Coal and Steel under grant agreement No 754070.Peer reviewe

Variants in EMX2 and PTEN do not contribute to risk of endometriosis

Endometriosis has a genetic component, and significant linkage has been found to a region on chromosome 10q. Two candidate genes, EMX2 and PTEN, implicated in both endometriosis and endometrial cancer, lie on chromosome 10q. We hypothesized that variation in EMX2 and/or PTEN could contribute to the risk of endometriosis and may account for some of the linkage signal on 10q. We genotyped single nucleotide polymorphisms (SNPs) in a case-control design to evaluate association between endometriosis and common variations in these two genes. The genotyping and statistical analysis were based on samples collected from Australian volunteers. The cases were 768 unrelated women with surgically confirmed endometriosis selected from affected sister pair (ASP) families participating in the Australian Genes behind Endometriosis Study. The controls were 768 female participants in twin studies who, based on screening questions, did not have a diagnosis of endometriosis. Genotypes of 22 SNPs in the EMX2 gene and 15 SNPs in the PTEN gene were the main outcome measures. Statistical analysis provided measures of linkage disequilibrium and association. Permutation testing showed no globally significant association between any SNPs or haplotypes and endometriosis for either gene. It is unlikely that the EMX2 or PTEN gene variants investigated contribute to risk for initiation and/or development of endometriosis