_STP_499-1972.pdf

TEMPER ALLOY EMBRITTLEMENT STEELS OF A symposium presented at the Seventy-fourth Annual Meeting AMERICAN SOCIETY FOR TESTING AND MATERIALS Atlantic City,N.J.,27 June-2 July 1971 ASTM SPECIAL TECHNICAL PUBLICATION 499 D.L.Newhouse,symposium chairman List price$10.00 04-499000-02 AMERICAN SOCIETY FOR TESTING AND MATERIALS 1 91 6 Race Street,Philadelphia,Pa.1 91 03 Copyright by ASTM Intl(all rights reserved);Mon Dec 21 11:07:47 EST 2015Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.BY AMERICAN SOCIETY FOR TESTING AND MATERIALS 1972 Library of Congress Catalog Card Number:73-185535 NOTE The Society is not responsible,as a body,for the statements and opinions advanced in this publication.Printed in Baltimore,Md.March 1972 Copyright by ASTM Intl(all rights reserved);Mon Dec 21 11:07:47 EST 2015Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.Foreword The Symposium on Temper Embrittlement of Alloy Steels was presented at the Seventy-fourth Annual Meeting of ASTM held in Atlantic City,N.J.,27 June-2 July 1971.Committee A-1 on Steel sponsored the symposium.D.L.Newhouse,General Electric Co.,presided as symposium chairman.Copyright by ASTM Intl(all rights reserved);Mon Dec 21 11:07:47 EST 2015Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.Related ASTM Publications Temper Embrittlement in Steel,STP 407(1968),$21.00 Effects of Residual Elements on Properties of Austen-itic Stainless Steels,STP 418(1967),$7.25 Chemical Composition and Rupture Strengths of Superstrength Alloys,DS 9 E(1970),$3.50 Copyright by ASTM Intl(all rights reserved);Mon Dec 21 11:07:47 EST 2015Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.Contents Introduction 1 Temper Embritflement Study of Ni-Cr-Mo-V Rotor Steels:Part I-Effects of Residual Elements-A Special Task Group Report 3 Temper Embrittlement Study of Ni-Cr-Mo-V Rotor Steels:Part II-Statistical Design and Analysis-a.K.STEWART 37 Chemical Analytical Results-How Accurate?-J.PENKROT AND F.P.BYRNE 51 Temper Embrittlement of Low Alloy Steels-g.JosHt AND D.F.STEIN 59 Effect of Solute Elements on Temper Embrittlement of Low Alloy Steels-H.L.MARCUS L.H.HACKETT,JR.AND P.W.PALMBERG 90 Alloy Effects in Temper Embrittlement-B.j.scHuLz AND C.J.MC MAHON,R.104 Copyright by ASTM Intl(all rights reserved);Mon Dec 21 11:07:47 EST 2015Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.Introduction STP499-EB/Mar.1972 The problems presented by temper embrittlement in the use of alloy steels in heavy sections are much the same in 1971 as they were at the time of the 1967 ASTM Symposium on Temper Embrittlement.Trends toward thicker sections and higher operating stresses have continued in heavy structural components such as large pressure vessels and turbine generator rotors.These trends in size and severity require steel with higher hardenability to provide for the higher through-section strength and fracture toughness needed in such components.The 1971 Symposium on Temper Embrittlement was convened to present the results of work which has been done in the field of temper embrittlement since the 1967 symposium,the proceedings of which have been published in ASTM STP 407,Temper Embrittlement of Steel.After the 1967 symposium the ASTM Special Task Force on Large Turbine and Generator Rotors of Subcommittee VI on Forgings of Committee A-1 on Steel undertook a study of the effects of residual elements in temper embrittlement.Other research was undertaken by several investigators on the microstructural and segregation aspects of temper embrittlement.The papers which appear in this volume present new information about the effects of the residual elements,arsenic,antimony,tin,and phosphorus,in the Ni-Cr-Mo-V steel used for rotor forgings.Several papers describing the statistical plan,analysis,and problems encountered in chemical analyses should be useful to those concerned with design and execution of metal-lurgical experiments.The application of Auger electron spectroscopy to the analysis of fracture surfaces and scanning electron microscopy for charac-terizing the mode of fracture shed important new light on the mechanisms of embrittlement,on the magnitude of segregation of both alloying elements and impurity elements at grain boundaries,and on the kinetics of embrittle-ment produced by various elements.It seems evident that the control of temper embrittlement in alloy steels used in heavy sections or operating in the embrittlement range will require further investigation of the effects of composition and heat treatment;will require further cooperative work in developing procedures