Hot

Isos

tatic

Pre

ssin

g of

Met

al

Pow

ders

for

Pres

sure

Ret

aini

ng P

WR

Com

pone

nts

EPR

I/NR

C R

evie

w ,

27th

June

201

2

Bar

ry B

urde

tt En

gine

erin

g Sp

ecia

list

Rol

ls-R

oyce

Rol

ls-R

oyce

dat

a

Rol

lsR

oyce

Prot

otyp

eTe

stin

g19

98-2

010

Prot

otyp

e Te

stin

g 1

998

2010

Type

316

L ~

1 -2

tons

Type

304

L ~

1 to

n

Hyd

rote

sted

&

dest

ruct

ivel

y te

sted

y

Isot

ropi

cm

echa

nica

lIs

otro

pic

mec

hani

cal

prop

ertie

s co

nfirm

ed

Rol

ls-R

oyce

dat

a

Met

allu

rgic

alas

pect

sM

etal

lurg

ical

asp

ects

Type

316

L st

ruct

ures

(x10

0)

HIP

ped

pow

der (

AST

M N

o. 5

)Fo

rgin

g (A

STM

No.

2)

Rol

ls-R

oyce

dat

a

Prev

ious

forg

ing

expe

rienc

e80

0

600

MPa

400

200

400

200

MPa

200 0

200 0

0Fo

rgin

gH

IP

Ulti

mat

e Te

nsile

Str

engt

h (R

T)

0Fo

rgin

gH

IP

Mec

hani

cal P

rope

rtie

s0.

2 Pr

oof S

tres

s

Rol

ls-R

oyce

dat

a

Cor

rosi

onte

stin

gM

L684

6Ju

ne19

99C

orro

sion

test

ing

ML6

846

June

199

9

AST

M G

36-9

4 (M

gCl 2)

-T

rans

gran

ular

Str

ess

Cor

rosi

on C

rack

ing

A

STM

G35

-88

(Wac

kenr

oder

’s S

olut

ion

U B

end)

-Int

ergr

anul

ar S

tres

s C

orro

sion

Cra

ckin

g

A

STM

G78

-95

(Boi

ler W

ater

Che

mis

try)

-C

revi

ce C

orro

sion

test

ing

A

STM

G48

-97

(FeC

l 3 So

lutio

n)-C

hlor

ide

Pitti

ng R

esis

tanc

e Te

st

A

STM

A26

2-93

(Oxa

lic A

cid

(A),

Aci

difie

d C

u 2SO

4(E

))-D

etec

tion

of S

usce

ptib

ility

to In

terg

ranu

lar A

ttack

Rol

ls-R

oyce

dat

a

Cor

rosi

onte

stin

gC

orro

sion

test

ing

A

STM

G36

-94

(MgC

l 2)

-Tra

nsgr

anul

ar S

tres

s C

orro

sion

Cra

ckin

g

Mat

eria

l31

6LAv

erag

e tim

e to

Fa

ilure

(hou

rs)

Num

ber o

f Te

sts

HIP

203

HIP

(Sen

sitis

ed)

203

(Sen

sitis

ed)

Wro

ught

153

Wro

ught

(Sen

sitis

ed)

153

Rol

ls-R

oyce

dat

a

Sens

itisa

tion

Trea

tmen

t-68

0°C

for

4 ho

urs

Cor

rosi

onte

stin

gC

orro

sion

test

ing

A

STM

G35

-88

(Wac

kenr

oder

’s S

olut

ion

U B

end)

-Int

ergr

anul

arSt

ress

Cor

rosi

onC

rack

ing

Inte

rgra

nula

r Str

ess

Cor

rosi

on C

rack

ing

No

crac

king

obs

erve

d in

HIP

or w

roug

ht p

rodu

ct a

fter 2

5 ho

urs

expo

sure

unde

rbin

ocul

arin

spec

tion

orho

urs

expo

sure

und

er b

inoc

ular

insp

ectio

n or

m

etal

logr

aphi

c se

ctio

ning

Rol

ls-R

oyce

dat

a

Cor

rosi

onte

stin

gC

orro

sion

test

ing

A

STM

G78

-95

(Boi

ler W

ater

Che

mis

try)

-C

revi

ceC

orro

sion

test

ing

Cre

vice

Cor

rosi

on te

stin

g

No

sign

of b

row

n st

aini

ng o

r cor

rosi

on a

fter t

hree

mon

ths

expo

sure

expo

sure

Rol

ls-R

oyce

dat

a

Cor

rosi

onte

stin

gC

orro

sion

test

ing

A

STM

G48

-97

(FeC

l 3 So

lutio

n)-C

hlor

ide

Pitti

n g R

esis

tanc

e Te

stg

Mat

eria

l31

6LAv

erag

e pi

t dep

th

(μm

)W

eigh

t los

s (%

)N

umbe

r of

Test

s

HIP

513

01

3H

IP51

30.

13

HIP

(Sen

sitis

ed)

1983

4.1

3

Wro

ught

524

13

Wro

ught

(Sen

sitis

ed)

958

18.3

3

Rol

ls-R

oyce

dat

a

Sens

itisa

tion

Trea

tmen

t-68

0°C

for

4 ho

urs

Cor

rosi

onte

stin

gC

orro

sion

test

ing

A

STM

A26

2-93

Pra

ctic

e A

(Oxa

lic A

cid)

-Det

ectio

n of

Sus

cept

ibili

ty to

Inte

rgra

nula

r Atta

ckp

yg

Dis

cont

inuo

us g

rain

bou

ndar

y di

tchi

ng w

as o

bser

ved

on b

oth

wro

ught

and

HIP

sens

itise

dm

ater

ial

wro

ught

and

HIP

sen

sitis

ed m

ater

ial

Bot

h w

roug

ht a

nd H

IP s

ensi

tised

spe

cim

ens

exhi

bite

d en

hanc

ed

atta

ckon

som

ecu

tfac

esTh

isis

cons

ider

edto

bedu

eto

atta

ck o

n so

me

cut f

aces

. Thi

s is

con

side

red

to b

e du

e to

re

sidu

al c

old

wor

k in

thes

e re

gion

s th

at h

as d

riven

car

bide

pr

ecip

itatio

n

Rol

ls-R

oyce

dat

a

Cor

rosi

onte

stin

g(R

ecom

men

ded

byR

egul

ator

)C

orro

sion

test

ing

(Rec

omm

ende

d by

Reg

ulat

or)

A

STM

A26

2-93

Pra

ctic

e E

(Aci

difie

d C

u 2SO

4 fo

r 24

hour

s)-D

etec

tion

of S

usce

ptib

ility

to In

terg

ranu

lar A

ttack

Se

ctio

n fr

om T

IG w

elde

d w

roug

ht to

HIP

Pip

ewor

k

N

o cr

acki

ng o

bser

ved

on fa

ce b

end

and

mic

rose

ctio

ns (3

off)

EP

RI T

estin

g of

Typ

e 31

6L to

Pra

ctic

e A

and

E

succ

essf

ulsu

cces

sful

Rol

ls-R

oyce

dat

a

EAC

test

ing

EAC

test

ing

Po

laris

atio

n te

stin

g in

prim

ary

and

seco

ndar

y w

ater

ch

emis

trie

s fa

iled

to in

itiat

e in

terg

ranu

lar s

tres

s i

kii

HIP

htt

il

corr

osio

n cr

acki

ng in

HIP

or w

roug

ht m

ater

ial

Sl

ow S

trai

n R

ate

Test

ing

(SSR

T)

Con

duct

ed in

2m

NaO

H w

ith o

verp

oten

tial:-

HIP

mat

eria

l per

form

ed a

s w

ell o

r slig

htly

bet

ter t

han

pg

yw

roug

ht-c

rack

gro

wth

rate

s in

HIP

sam

ples

wer

e ty

pica

lly 5

0-75

% o

f tho

se in

wro

ught

mat

eria

l

Rol

ls-R

oyce

dat

a

Add

ition

alEA

Cte

stin

gA

dditi

onal

EA

C te

stin

g

Supp

lem

enta

ry S

SRT

in p

hosp

hate

l

tih

hi

lt

solu

tions

has

sho

wn

equi

vale

nt

beha

viou

r in

HIP

316

L

Rol

ls-R

oyce

dat

a

Elim

inat

ion

ofW

elde

dJo

ints

Elim

inat

ion

of W

elde

d Jo

ints

M

any

serv

ice

prob

lem

s di

rect

ly a

ttrib

utab

le to

the

pres

ence

of a

wel

d du

e to

any

one

or c

ombi

natio

n of

:

Wel

ding

Res

idua

l Str

ess

Cha

nge

in lo

cal m

icro

stru

ctur

eIn

trod

uctio

n of

Wel

d D

efec

ts

H

IPpe

d p

rodu

ct h

as p

oten

tial f

or fe

wer

wel

ded

conn

ectio

ns-s

ubst

antia

l sav

ings

in c

osts

of p

ipew

ork

man

ufac

ture

El

imin

atio

n of

wel

ds is

ben

efic

ial,

rem

oves

pot

entia

l ,

ppr

oble

m re

gion

s, le

adin

g to

impr

oved

str

uctu

ral

inte

grity

of t

he c

ompo

nent

Rol

ls-R

oyce

dat

a

Reg

ulat

orpo

sitio

nR

egul

ator

pos

ition

U

K S

afet

y &

Rel

iabi

lity

Dire

ctor

ate

(SR

D)

ld

tif

d(S

RD

) alre

ady

supp

ortiv

e of

pow

der

HIP

ping

follo

win

g in

tern

al re

view

SR

D h

ave

endo

rsed

the

mec

hani

cal

di

tti

tt

il

dd

and

corr

osio

n te

stin

g ou

tput

s in

clud

ed

in c

ompo

nent

saf

ety

just

ifica

tions

Rol

ls-R

oyce

dat

a

Cor

rosi

onte

stin

gsu

mm

ary

Cor

rosi

on te

stin

g su

mm

ary

G

ener

al c

orro

sion

and

env

ironm

enta

lly

assi

sted

crac

king

test

sha

vecl

early

assi

sted

cra

ckin

g te

sts

have

cle

arly

de

mon

stra

ted

that

HIP

pow

der T

ype

316L

m

ater

ial h

as e

quiv

alen

t or s

light

ly b

ette

r co

rros

ion

resi

stan

ce th

an w

roug

ht m

ater

ial

Im

prov

emen

ts in

cor

rosi

on b

ehav

iour

are

co

nsid

ered

to b

e du

e to

the

low

leve

l of

incl

usio

nsan

dun

iform

mic

rost

ruct

ure

inH

IPin

clus

ions

and

uni

form

mic

rost

ruct

ure

in H

IP

pow

der p

rodu

ct.

Rol

ls-R

oyce

dat

a