{"id":2233,"date":"2021-08-04T12:53:31","date_gmt":"2021-08-04T12:53:31","guid":{"rendered":"https:\/\/wldstainless.com\/?p=2233"},"modified":"2021-08-04T12:57:01","modified_gmt":"2021-08-04T12:57:01","slug":"high-strength-stainless-steel-used-in-aircraft-applications","status":"publish","type":"post","link":"https:\/\/wldstainless.com\/tr\/high-strength-stainless-steel-used-in-aircraft-applications\/","title":{"rendered":"U\u00e7ak uygulamalar\u0131nda kullan\u0131lan y\u00fcksek mukavemetli paslanmaz \u00e7elik"},"content":{"rendered":"

Genellikle 800 MPa'dan y\u00fcksek \u00e7ekme mukavemeti, 500 MPa'dan y\u00fcksek sertlik de\u011feri olan paslanmaz \u00e7elikleri y\u00fcksek sertlikli paslanmaz \u00e7elik olarak adland\u0131r\u0131l\u0131r; sertlik de\u011feri 1380 MPa'dan y\u00fcksek olan paslanmaz \u00e7elikleri ise ultra y\u00fcksek sertlikli paslanmaz \u00e7elik olarak adland\u0131r\u0131l\u0131r. Havac\u0131l\u0131k end\u00fcstrisinin geli\u015fimi, u\u00e7ak ve havac\u0131l\u0131k motorunun performans\u0131n\u0131n b\u00fcy\u00fck \u00f6l\u00e7\u00fcde metal malzemelere ba\u011fl\u0131 oldu\u011funu g\u00f6stermi\u015ftir. Y\u00fcksek mukavemet, y\u00fcksek tokluk, y\u00fcksek gerilme korozyon \u00e7atlamas\u0131na kar\u015f\u0131 diren\u00e7 ve \u00e7eli\u011fin iyi darbe dayan\u0131m\u0131na sahip olmas\u0131 nedeniyle, ini\u015f tak\u0131mlar\u0131, kiri\u015fler, y\u00fcksek gerilme ba\u011flant\u0131lar\u0131, ba\u011flant\u0131 elemanlar\u0131 ve di\u011fer y\u00fcksek mukavemetli paslanmaz \u00e7elikler gibi u\u00e7aklar\u0131n baz\u0131 \u00f6nemli yap\u0131sal bile\u015fenleri hala kullan\u0131lmaktad\u0131r.<\/p>\n

Y\u00fcksek dayan\u0131ml\u0131 paslanmaz \u00e7elikler esas olarak Martensit \u00e7\u00f6kelme sertle\u015ftirme paslanmaz \u00e7elikler ve yar\u0131-Austenit \u00e7\u00f6kelme sertle\u015ftirme paslanmaz \u00e7elikler i\u00e7erir. Martensit \u00e7\u00f6kelme sertle\u015ftirme paslanmaz \u00e7eli\u011fin dayan\u0131kl\u0131l\u0131\u011f\u0131, martensit d\u00f6n\u00fc\u015f\u00fcm\u00fc ve \u00e7\u00f6kelme sertle\u015ftirme i\u015flemiyle elde edilir; avantaj\u0131 y\u00fcksek dayan\u0131kl\u0131l\u0131kt\u0131r; ayn\u0131 zamanda d\u00fc\u015f\u00fck karbon, y\u00fcksek krom, y\u00fcksek molibden ve\/veya y\u00fcksek bak\u0131r nedeniyle korozyon direnci genellikle 18Cr-8Ni austenitik paslanmaz \u00e7elikten daha az de\u011fildir; Kesme \u00f6zg\u00fcrl\u00fc\u011f\u00fc, iyi kaynak yapabilme \u00f6zelli\u011fi ve kaynak sonras\u0131 yerel tavlama gerekmemesi nedeniyle kaynak sonras\u0131 \u0131s\u0131 i\u015fleme i\u015flemi nispeten basittir. Temel dezavantaj\u0131, tavlanm\u0131\u015f halde bile yap\u0131n\u0131n hala d\u00fc\u015f\u00fck karbonlu martensit oldu\u011fu ve bu nedenle derin deformasyonlu so\u011fuk i\u015fleme yap\u0131lmas\u0131 zor olmas\u0131d\u0131r. Tipik \u00e7elik s\u0131n\u0131f\u0131 17-4PH<\/a> PH13-8Mo, motor yatak par\u00e7alar\u0131, ba\u011flant\u0131 elemanlar\u0131 vb. gibi y\u00fcksek mukavemetli korozyona dayan\u0131kl\u0131 yatak bile\u015fenlerinin \u00fcretiminde kullan\u0131l\u0131r. PH13-8Mo, 400\u00b0C'de \u00e7al\u0131\u015fan havac\u0131l\u0131k yataklar\u0131nda korozyona dayan\u0131kl\u0131 orta s\u0131cakl\u0131kl\u0131 yap\u0131sal par\u00e7alarda yayg\u0131n olarak kullan\u0131lmaktad\u0131r.<\/p>\n

Yar\u0131-Austenitli \u00e7\u00f6keltme sertle\u015fmi\u015f paslanmaz \u00e7elik, Austenit durumunda i\u015flenebilir, so\u011fuk deforme edilebilir ve kaynaklanabilir; daha sonra martensitik d\u00f6n\u00fc\u015f\u00fcm ve \u00e7\u00f6keltme sertle\u015fmesi, ya\u015flanmay\u0131 ayarlayarak farkl\u0131 mukavemet ve tokluk koordinasyonlar\u0131 elde edilerek kontrol edilebilir. \u00c7elik iyi korozyon direnci ve termal mukavemet, \u00f6zellikle stres korozyon direnci \u00f6zelliklerine sahiptir ve \u00f6zellikle 540 \u00b0C'nin alt\u0131ndaki par\u00e7alar\u0131n \u00fcretimi i\u00e7in uygundur. Dezavantaj\u0131, \u0131s\u0131l i\u015flem s\u00fcrecinin karma\u015f\u0131k olmas\u0131, \u0131s\u0131l i\u015flem s\u0131cakl\u0131\u011f\u0131 kontrol gereksinimlerinin \u00e7ok hassas olmas\u0131 (\u00b15 \u00b0C) ve \u00e7eliklerin i\u015flenmesinde i\u015flenebilirlik i\u00e7in genellikle \u00e7ok say\u0131da ara tavlama s\u00fcresi gerektirmesidir. Tipik dereceler \u015funlard\u0131r: 17-7PH<\/a>PH15-7Mo vb. Bu \u00e7elik t\u00fcr\u00fc, 400\u00b0C'nin alt\u0131nda korozif ortamda \u00e7al\u0131\u015fan u\u00e7ak end\u00fcstrisinde yayg\u0131n olarak kullan\u0131lmaktad\u0131r; \u00f6rne\u011fin her t\u00fcrl\u00fc boru, boru ba\u011flant\u0131s\u0131, yay, ba\u011flant\u0131 eleman\u0131 vb.<\/p>\n

 <\/p>\n

U\u00e7ak ini\u015f tertibat\u0131<\/h3>\n

U\u00e7ak ini\u015f tertibat\u0131n\u0131n yap\u0131m\u0131nda kullan\u0131lan malzemeler 30CrMnSiNi2A, 4340, 300M, Aermet100 ve daha y\u00fcksek gereksinimlere sahip di\u011fer u\u00e7ak ini\u015f tertibatlar\u0131 ve ba\u011flant\u0131 elemanlar\u0131 \u00e7o\u011funlukla \u00e7\u00f6keltme sertle\u015ftirilmi\u015f paslanmaz \u00e7elikten \u00fcretilmektedir; \u00f6rne\u011fin: 17-4PH<\/a> F-15 u\u00e7aklar\u0131n\u0131n ini\u015f tak\u0131mlar\u0131 i\u00e7in 15-5pH, B-767 u\u00e7aklar\u0131n\u0131n ini\u015f tak\u0131mlar\u0131 i\u00e7in 15-5pH. PH13-8mo \u00e7eli\u011fi 17-4PH yerine ge\u00e7me potansiyeline sahiptir. 15-5PH<\/a>, 17-7PH, PH15-7Mo ve di\u011fer \u00e7elikler, ayn\u0131 kaliteye sahip \u00e7\u00f6keltme sertle\u015ftirilmi\u015f paslanmaz \u00e7elikten daha iyi gerilme korozyon direnci nedeniyle.<\/p>\n

U\u00e7an u\u00e7ak<\/h3>\n

Alman FAG \u015firketi, y\u00fcksek bas\u0131n\u00e7l\u0131 azot atmosferinde elektrolag remelting y\u00f6ntemiyle \u00fcretilen azotlu martensitli paslanmaz \u00e7elik Cronidur30 (0.31%C-0.38%N-15% Cr-L %Mo) adl\u0131 \u00fcr\u00fcn\u00fc geli\u015ftirdi. Bu \u00fcr\u00fcn, tamamen sertle\u015fmi\u015f azotlu y\u00fcksek s\u0131cakl\u0131kl\u0131 paslanmaz \u00e7eliktir ve SUS440'a g\u00f6re daha dayan\u0131kl\u0131d\u0131r. Tam sertle\u015fme tipi \u00f6zellikleri nedeniyle DN de\u011feri y\u00fcksek olan (D: yatak i\u00e7 \u00e7ap\u0131\/mm, N: mil devri\/min) y\u00fcksek DN de\u011ferine sahip ekipmanlarda kullan\u0131lmamal\u0131d\u0131r; ayn\u0131 Cronidur30 y\u00fcksek frekansl\u0131 so\u011futma sayesinde DN4 milyon de\u011ferindeki geriye kalan bas\u0131n\u00e7 gerilimi ve k\u0131r\u0131lma toklu\u011fu de\u011ferini ayn\u0131 anda kar\u015f\u0131layabilir. Ancak temperleme s\u0131cakl\u0131\u011f\u0131 15O\u00b0C'den d\u00fc\u015f\u00fck oldu\u011fundan, motor \u00e7al\u0131\u015ft\u0131r\u0131ld\u0131ktan sonra olu\u015fan termal \u015fok nedeniyle yatak s\u0131cakl\u0131\u011f\u0131n\u0131n y\u00fckselmesine kar\u015f\u0131 dayan\u0131kl\u0131l\u0131k g\u00f6stermez.<\/p>\n

Yap\u0131sal par\u00e7alar\u0131 bulunan u\u00e7aklar<\/h3>\n

U\u00e7ak yatak yap\u0131s\u0131nda y\u00fcksek mukavemetli paslanmaz \u00e7elik a\u011f\u0131rl\u0131kl\u0131 olarak kullan\u0131l\u0131r. 15-5PH<\/a>, 17-4PH, PH13-8Mo vb. gibi kapak kilitleri, y\u00fcksek mukavemetli c\u0131vata, yay ve di\u011fer par\u00e7alar dahil olmak \u00fczere sivil u\u00e7aklarda kullan\u0131lan y\u00fcksek mukavemetli paslanmaz \u00e7elikler, \u00f6rne\u011fin Boeing 737-600 kanat kollar\u0131nda kullan\u0131lan 15-5PH \u00e7eli\u011fi; Type A340-300 kanat kollar\u0131nda kullan\u0131lan PH13-8Mo \u00e7eli\u011fi. Ph13-8Mo, \u00f6zellikle transvers performans gerektiren par\u00e7alar i\u00e7in, \u00f6rne\u011fin g\u00f6vde \u00e7er\u00e7eveleri i\u00e7in y\u00fcksek mukavemet ve tokluk gerektiren malzemelerdir. Daha yak\u0131n zamanda, Carpenter taraf\u0131ndan Custom450 ve Custom455 baz\u0131nda geli\u015ftirilen Ph13-8Mo, u\u00e7ak kanat y\u00f6nlendirme kollar\u0131, slat y\u00f6nlendirme kollar\u0131, \u015fanz\u0131manlar, motor montajlar\u0131 vb. \u00fcretimi i\u00e7in kullan\u0131lmaktad\u0131r. Bu \u00e7elik \u015fu anda MMPDS-02, AMS5936 ve ASTM A564 teknik spesifikasyonlar\u0131nda yer almaktad\u0131r. HSL180 y\u00fcksek mukavemetli paslanmaz \u00e7elik (0.21C-12.5Cr-1.0Ni-15.5Co-2.0Mo) u\u00e7ak yap\u0131s\u0131 \u00fcretimi i\u00e7in kullan\u0131l\u0131r; bu \u00e7elik, 4340 gibi d\u00fc\u015f\u00fck ala\u015f\u0131ml\u0131 \u00e7eliklerin sahip oldu\u011fu 1800MPa dayan\u0131kl\u0131l\u0131\u011f\u0131 ve SUS630 gibi \u00e7\u00f6keltme sertle\u015ftirilmi\u015f paslanmaz \u00e7eliklerin sahip oldu\u011fu ayn\u0131 korozyon direnci ve sertlik \u00f6zelli\u011fine sahiptir.<\/p>\n

 <\/p>","protected":false},"excerpt":{"rendered":"

We usually call tensile strength higher than 800MPa, yield strength higher than 500MPa stainless steel is high strength stainless steel, yield strength higher than 1380MPa stainless steel is called ultra high strength stainless steel. The development of the aviation industry has proved that the improvement of aircraft and aero-engine performance largely depends on metal materials. […]<\/p>","protected":false},"author":1,"featured_media":2235,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2233","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-social-activities"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t