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SUMMARY:Effect of processing parameters on intermetallic phase content and
  impact toughness for super duplex alloy PM HIP Sandvik SAF 2507™
DTSTART;VALUE=DATE-TIME:20171207T003000Z
DTEND;VALUE=DATE-TIME:20171207T010500Z
DTSTAMP;VALUE=DATE-TIME:20260510T120401Z
UID:indico-contribution-291-1040@events01.synchrotron.org.au
DESCRIPTION:Speakers: Martin Östlund (Sandvik Materials Technology)\nPM H
 IP is a widely applied manufacturing technology to produce thick walled an
 d complex shaped duplex and super duplex stainless steel (DSS and SDSS) co
 mponents for the petrochemical as well as the oil and gas industry. The PM
  HIP process offers the advantage of a fine grained microstructure which g
 enerates an increased resistance to HISC (Hydrogen Induced Stress Cracking
 ) as well as higher yield strength. A limiting factor when producing thick
  walled components of DSS and SDSS alloys is the precipitation of brittle 
 intermetallic phases which results in decreased corrosion resistance and i
 mpact toughness if high enough fractions are precipitated. The precipitati
 on of intermetallic phases is a diffusion controlled process that may take
  place during quenching following solution annealing if the cooling rate i
 s too slow. The thicker wall of the component\, the slower is the cooling 
 in the center of the wall which enables increased intermetallic phase prec
 ipitation. In this article it is shown that a coarser PM HIP microstructur
 e results in lower contents of intermetallic phases after water quenching.
  However\, despite of the lower intermetallic phase content the impact tou
 ghness is not improved and this is explained by the fracture mechanisms as
  shown by instrumented impact testing and fracture surface analysis.\n\nht
 tps://events01.synchrotron.org.au/event/47/contributions/1040/
LOCATION:
URL:https://events01.synchrotron.org.au/event/47/contributions/1040/
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SUMMARY:HIP process of a valve body to Near-Net-Shape using Grade 91 powde
 r
DTSTART;VALUE=DATE-TIME:20171207T010500Z
DTEND;VALUE=DATE-TIME:20171207T013000Z
DTSTAMP;VALUE=DATE-TIME:20260510T120401Z
UID:indico-contribution-291-1033@events01.synchrotron.org.au
DESCRIPTION:Speakers: Toyohito Shiokawa (Metal Technology Co. Ltd.)\nMater
 ial used for steam piping of power plants is exposed to high temperatures 
 and high pressures over long periods. As a consequence\, forged Grade 91 a
 lloy steel is commonly chosen to meet these demands. However\, complicated
  structures such as a valve body need to be machined from large forged blo
 cks. As a result\, the machining time is long and the material weight is h
 eavy. Therefore\, by manufacturing a valve body with near net technology\,
  both time and material weight can be reduced.\nThis paper will present 1)
  A survey of the dimensions of a near net shape valve body by HIP\, 2) An 
 investigation of the mechanical properties of NNS Grade 91\, 3) A comparis
 on of the structure of a HIP sintered product and a forged product\, 4) Th
 e machining time and material weight of a near net molded product by HIP c
 ompared to a product forged from blocks. This paper will illustrate that t
 he near net shaped product was able to reduce the machining time by 30% an
 d the material weight by 40% than when machining from a forged product.\n\
 nhttps://events01.synchrotron.org.au/event/47/contributions/1033/
LOCATION:
URL:https://events01.synchrotron.org.au/event/47/contributions/1033/
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SUMMARY:Exhaust valve spindles for marine diesel engines manufactured by h
 ot isostatic pressing
DTSTART;VALUE=DATE-TIME:20171207T013000Z
DTEND;VALUE=DATE-TIME:20171207T015500Z
DTSTAMP;VALUE=DATE-TIME:20260510T120401Z
UID:indico-contribution-291-988@events01.synchrotron.org.au
DESCRIPTION:Speakers: Alberto Lapina (MAN Diesel & Turbo)\nThe exhaust val
 ve spindle is one of the most challenging components in the marine two-str
 oke diesel engine. It has to withstand high mechanical loads\, thermal cyc
 ling\, surface temperatures beyond 700 $^{\\circ}$C\, and molten salt indu
 ced corrosion. \n\nPowder metallurgy gives the opportunity of improving th
 e component using materials not applicable by welding or forging. Therefor
 e exhaust valve spindles have been produced by Hot Isostatic Pressing (HIP
 ) with a spindle disc coating of a Ni-Cr-Nb alloy that cannot be manufactu
 red by welding or forging.\n\nThis paper presents the service experience g
 athered by MAN Diesel & Turbo in a number of service tests on ships (up to
  18000 running hours): corrosion and degradation phenomena in the spindles
  produce by HIP are presented and compared with the performance of state-o
 f-the-art exhaust valve spindles.\n\nThe macroscopic geometrical changes e
 xperienced by the spindles are studied by means of Finite Element Method (
 FEM) calculations and strategies for further development of the component 
 are outlined.\n\nhttps://events01.synchrotron.org.au/event/47/contribution
 s/988/
LOCATION:
URL:https://events01.synchrotron.org.au/event/47/contributions/988/
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