...) model predictions for the nine steels. Tensile and converted shear punch and microhardness measurements of Δσ y generally show a continuing increase between intermediate and high ATR-2 fluences. The Eason-Odette-Nanstad-Yamamoto and ASTM E900 ETC models underpredict embrittlement at the ATR-2...

..., appear in NSF and E635. The observed changes of microhardness are discussed from the viewpoint of generation of radiation defects (clusters, dislocation loops), evolution of the initial dislocation structure, and matrix composition (enrichment in Fe, Cr, and, probably, Nb). zirconium alloys...

... of the irradiated material. The recovery of the radiation induced hardening has been investigated using microhardness tests. Transmission electron microscopy (TEM) observations performed on irradiated foils have also shown that the loop density falls while the loop size increases during the thermal annealing...

... for the unirradiated archive material and 0.23 (μm after irradiation. The archive material was characterized using optical metallography, crystallographic texture measurements, microstructural analysis using STEM, and microhardness measurements. In addition to the optical and electron microscopy for microstructural...

... possible, irradiation hardening of the alloys was experimentally evaluated by microhardness and shear punch. For comparison, irradiation hardening was also calculated using a barrier hardening model and the microstructural data. Experimentally measured values of yield stress were in agreement...

... a framework for the construction of a physically based mechanistic model of irradiation embrittlement and annealing behavior. pressure vessel steel irradiation embrittlement annealing recovery models microstructure mechanisms coarsening microhardness precipitates Randy G. Lot0 and Paula D...

..., however, decreased with increasing neutron fluence. The hardness anisotropy was analyzed using the average Taylor factor. molybdenum neutron irradiation microhardness anisotropy mechanical property Knoop hardness K a t s u n o r i Abe 1, Manabu Kanzaki 2, Manabu Satou 3 and K a t s u h i k o...

... Microhardness and small punch (SP) tests were conducted to improve the reliability of evaluating the ductile-to-brittle transition temperature (DBTT) shift caused by aging (thermal aging, neutron irradiation, cold rolling) using several model alloys (Fe-0.15C alloys and 2¼Cr-1Mo steels...

... microhardness surface modification Anil K. Goel, ' Niranjan D. Sharma, ~Rajendra K. Mohindra, ~Prakriti K. Ghosh,2 and Mukesh C. Bhatnagar, 3 Surface Modification of Austenitic 304 Stainless Steel by and 11 ;- Ion Implantation REFERENCE: Goel, A. K., Sharma, N. D., Mohindra, R. K., Ghosh, P. K...

... Changes in the microhardness of an aged Nimonic 90 containing γ′-precipitates are monitored as a function of dose after 50 keV helium ion irradiation at room temperature in the dose range from 3 × 10 20 to 3 × 10 22 helium ions/m 2 . The microhardness showed an oscillatory behaviour...

... of examples to show this potential is realizable. glasses metals microhardness mechanical properties microindentation precision machining semiconductors single point diamond turning subsurface damage Young's modulus Manuscript received 12-29-89 Microindentation as a Technique For Assessing...

.... This model is based on a series of annealing and reirradiation studies performed using microhardness specimens. Most of these materials were originally irradiated in nuclear pressure vessel surveillance programs. The model is based on the concept of a benefit factor, which compares the annealed...

... An interlaboratory test program (“round-robin”) was conducted by ASTM Committee E-4 on Metallography to develop information for a Precision and Bias section for ASTM Test Method for Microhardness of Materials (E 384). Knoop and Vickers indents were made by one person using seven specimens...

.... Analysis of the test results according to E 691 have been used to prepare a Precision and Bias section for ASTM Test Method for Microhardness of Materials (E 384). Fourteen laboratories measured the indents in the three ferrous specimens and nine labs had similar Vickers hardness measurements...

... Rockwell, Brinell, and microhardness are the common indentation hardness tests discussed in this paper. Indentation hardness testing, in many cases, can be properly considered a nondestructive test since the part is usable after the test. The destructive effect at the test point, however, makes...

... The microstructure and microhardness of several niobium-base binary and ternary alloys were investigated following fast neutron irradiation to a fluence of 18 dpa (4.8 × 10 22 n/cm 2 , >0.1 MeV) at 650°C. Transmission electron microscope (TEM) procedures were employed to observe...

... Microhardness values of plated coating have been included as part of many specifications without much information on the precision and bias of the test method. To develop this information for inclusion in a proposed revision of an ASTM test method covering this subject, some additional round...

... Light-ion irradiation creep testing was combined with microhardness testing to study changes in creep strength of two model ferritic alloys. Creep enhancement followed by radiation hardening was observed for both alloys. Post-irradiation creep rates and post-irradiation microhardness data...

... In response to the requirements of the fusion reactor materials development program for small-scale mechanical property tests, two techniques have been developed, namely ball microhardness and shear punch tests. The ball microhardness test is based on the repeated measurement at increasing loads...

...) at a flux of ~3 × 10 12 n/cm 2 · s and at four temperatures from 270°C to 315°C. The alloys had a range of copper and nickel concentrations and microstructures. Post-irradiation microhardness testing showed the following: radiation hardening systematically decreased, albeit modestly, with increasing...