Word: prevented
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Dates: during 1960-1969
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...times as far as present-day high-strength steel without fracturing its molecular structure. More important, when TRIP steel eventually reaches the point of crack-inducing stress, a solid-state chemical reaction is triggered that blunts small cracks just as they begin, then fills them in to prevent major wounds. The chemical change precipitating this "self-healing" process takes place on a near-atomic scale, and can be observed only with the aid of an electron microscope. The actual halting and filling in of a crack, however, can sometimes be seen with the naked...
...other areas of metallurgy. "We expect there will be an analogous series of alloys for titanium," says Zackay. "We just haven't had time to look for them." Titanium is used in jet aircraft, and although both engineers termed the idea of using TRIP-processed materials to prevent metal fatigue "pure speculation" at this point, it is not beyond the realm of possibility. Other conceivable uses of TRIP steel: storage tanks to withstand the super-coolness (as much as -450° F.) of liquid helium, hydrogen, nitrogen and oxygen; chemical-processing equipment; roller and ball bearings. TRIP...
...Robens turned in his resignation, saying that while "the doctrine of ministerial responsibility does not strictly apply" in his case, "I follow its rules." The government promptly announced that it would sit on the resignation, at least until the N.C.B. had finished its own report on measures to prevent future disasters. If Robens was to be the Aberfan scapegoat, he now stood as something of a martyr -and to many Britons the government seemed to be playing politics by delaying his exit. Robens seemed to agree: he promptly set to speeding up the N.C.B. report...
Sullivan's order was adopted. It also asked the City Manager to confer with Harvard to seek adequate 24-hour supervision of this area in order to prevent it from becoming "a haven for undesirable persons, thereby destroying the purpose for which this beautiful area was constructed...
Wall posters in Peking announced that farmers were threatening to march through Kiangsu province to lay siege to Nanking and Shanghai. Mass move ments of refugees were reported, and the People's Liberation Army massed troops at the border to prevent any from escaping into Hong Kong...